Ebesque Xl 300 Mg Prolonged-Release Tablets

Document: spc-doc_PL 20311-0028 change

SUMMARY OF PRODUCT CHARACTERISTICS

1 NAME OF THE MEDICINAL PRODUCT

Ebesque XL 300 mg prolonged-release tablets

2 QUALITATIVE AND QUANTITATIVE COMPOSITION

One tablet contains 300 mg quetiapine (as quetiapine fumarate).

Excipients with known effect: 42.6 mg lactose per tablet.

For the full list of excipients, see section 6.1.

3 PHARMACEUTICAL FORM

Prolonged-release tablet.

Pale yellow coloured, capsule shaped, biconvex, prolonged-release tablets, printed with ‘244’ with black ink.

4 CLINICAL PARTICULARS

4.1 Therapeutic indications

Ebesque XL is indicated in adults for

• treatment of Schizophrenia, including:

o preventing relapse in stable schizophrenic patients who have been maintained on Ebesque XL

• treatment of bipolar disorder:

o For the treatment of moderate to severe manic episodes in bipolar disorder

o For the treatment of major depressive episodes in bipolar disorder o For the prevention of recurrence in patients with bipolar disorder, in patients whose manic or depressive episode has responded to quetiapine treatment

• add-on treatment of major depressive episodes in patients with Major Depressive Disorder (MDD) who have had sub-optimal response to antidepressant monotherapy (see section 5.1). Prior to initiating treatment, clinicians should consider the safety profile of Ebesque XL (see section 4.4).

4.2 Posology and method of administration

Posology:

Different dosing schedules exist for each indication. It must therefore be ensured that patients receive clear information on the appropriate dosage for their condition.

Adults:

For the treatment of schizophrenia and moderate to severe manic episodes in bipolar disorder

Ebesque XL should be administered at least one hour before a meal. The daily dose at the start of therapy is 300 mg on Day 1 and 600 mg on Day 2. The recommended daily dose is 600 mg, however if clinically justified the dose may be increased to 800 mg daily. The dose should be adjusted within the effective dose range of 400 mg to 800 mg per day, depending on the clinical response and tolerability of the patient. For maintenance therapy in schizophrenia no dosage adjustment is necessary.

For the treatment of depressive episodes in bipolar disorder

Ebesque XL should be administered at bedtime. The total daily dose for the first four days of therapy is 50 mg (Day 1), 100 mg (Day 2), 200 mg (Day 3) and 300 mg (Day 4). The recommended daily dose is 300 mg. In clinical trials, no additional benefit was seen in the 600 mg group compared to the 300 mg group (see section 5.1). Individual patients may benefit from a 600 mg dose. Doses greater than 300 mg should be initiated by physicians experienced in treating bipolar disorder. In individual patients, in the event of tolerance concerns, clinical trials have indicated that dose reduction to a minimum of 200 mg could be considered.

For preventing recurrence in bipolar disorder

For preventing recurrence of manic, mixed or depressive episodes in bipolar disorder, patients who have responded to Ebesque XL for acute treatment of bipolar disorder should continue on Ebesque XL at the same dose administered at bedtime. Ebesque XL can be adjusted depending on clinical response and tolerability of the individual patient within the dose range of 300 mg to 800 mg/day. It is important that the lowest effective dose is used for maintenance therapy.

For add-on treatment of major depressive episodes in MDD

Ebesque XL should be administered prior to bedtime. The daily dose at the start of therapy is 50 mg on Day 1 and 2, and 150 mg on Day 3 and 4. Antidepressant effect was seen at 150 mg and 300 mg/day in short-term trials as add-on therapy (with amitriptyline, bupropion, citalopram, duloxetine, escitalopram, fluoxetine, paroxetine, sertraline and venlafaxine - see section 5.1) and at 50 mg/day in short-term monotherapy trials. There is an increased risk of adverse events at higher doses. Clinicians should therefore ensure that the lowest effective dose, starting with 50 mg/day, is used for treatment. The need to increase the dose from 150 mg to 300 mg/day should be based on individual patient evaluation.

Switching from quetiapine immediate-release tablets:

For more convenient dosing, patients who are currently being treated with divided doses of immediate release quetiapine tablets may be switched to Ebesque XL at the equivalent total daily dose taken once daily. Individual dosage adjustments may be

Special Populations:

Older people:

As with other antipsychotics and antidepressants, Ebesque XL should be used with caution in the older people, especially during the initial dosing period. The rate of dose titration of Ebesque XL may need to be slower, and the daily therapeutic dose lower, than that used in younger patients. The mean plasma clearance of quetiapine was reduced by 30% to 50% in older patients when compared to younger patients. Older patients should be started on 50 mg/day. The dose can be increased in increments of 50 mg/day to an effective dose, depending on the clinical response and tolerability of the individual patient.

In older patients with major depressive episodes in MDD, dosing should begin with 50 mg/day on Days 1-3, increasing to 100 mg/day on Day 4 and 150 mg/day on Day 8. The lowest effective dose, starting from 50 mg/day should be used. Based on individual patient evaluation, if dose increase to 300 mg/day is required this should not be prior to Day 22 of treatment.

Efficacy and safety have not been evaluated in patients over 65 years with depressive episodes in the framework of bipolar disorder.

Renal impairment:

Dosage adjustment is not necessary in patients with renal impairment.

Hepatic impairment:

Quetiapine is extensively metabolised by the liver. Therefore, Ebesque XL should be used with caution in patients with known hepatic impairment, especially during the initial dosing period. Patients with hepatic impairment should be started on 50 mg/day. The dose can be increased in increments of 50 mg/day to an effective dose, depending on the clinical response and tolerability of the individual patient.

Paediatric Population:

Ebesque XL is not recommended for use in children and adolescents below 18 years of age, due to a lack of data to support use in this age group. The available evidence from placebo-controlled clinical trials is presented in sections 4.4, 4.8, 5.1 and 5.2.

Method of administration:

Ebesque XL should be administered once daily, without food. The tablets should be swallowed whole and not split, chewed or crushed.

4.3 Contraindications

Hypersensitivity to the active substance or to any of the excipients listed in section 6.1.

Concomitant administration of cytochrome P450 3A4 inhibitors, such as HIV-protease inhibitors, azole-antifungal agents, erythromycin, clarithromycin and nefazodone, is contraindicated. (See section 4.5).

4.4 Special warnings and precautions for use

As Ebesque XL is indicated for the treatment of schizophrenia, bipolar disorder and add-on treatment of major depressive episodes in patients with MDD, the safety profile should be considered with respect to the individual patient’s diagnosis and the dose being administered.

Long-term efficacy and safety in patients with MDD has not been evaluated as add-on therapy, however long-term efficacy and safety has been evaluated in adult patients as monotherapy (see section 5.1).

Children and adolescents (10 to 17 years of age)

Ebesque XL is not recommended for use in children and adolescents below 18 years of age, due to a lack of data to support use in this age group. Clinical trials with quetiapine have shown that in addition to the known safety profile identified in adults (see section 4.8), certain adverse events occurred at a higher frequency in children and adolescents compared to adults (increased appetite, elevations in serum prolactin, vomiting, rhinitis and syncope) or may have different implications for children and adolescents (extrapyramidal symptoms and irritability) and one was identified that has not been previously seen in adult studies (increases in blood pressure). Changes in thyroid function tests have also been observed in children and adolescents.

Furthermore, the long-term safety implications of treatment with quetiapine on growth and maturation have not been studied beyond 26 weeks. Long-term implications for cognitive and behavioural development are not known.

In placebo-controlled clinical trials with children and adolescent patients treated with quetiapine, quetiapine was associated with an increased incidence of extrapyramidal symptoms (EPS) compared to placebo in patients treated for schizophrenia and bipolar mania and bipolar depression (see section 4.8).

Suicide/suicidal thoughts or clinical worsening:

Depression is associated with an increased risk of suicidal thoughts, self-harm and suicide (suicide-related events). This risk persists until significant remission occurs. As improvement may not occur during the first few weeks or more of treatment, patients should be closely monitored until such improvement occurs. It is general clinical experience that the risk of suicide may increase in the early stages of recovery.

In addition physicians should consider the potential risk of suicide-related events after abrupt cessation of quetiapine treatment, due to the known risk factors for the disease being treated.

Other psychiatric conditions for which Ebesque XL is prescribed can also be associated with an increased risk of suicide related events. In addition, these conditions may be co-morbid with major depressive episodes. The same precautions observed when treating patients with major depressive episodes should therefore be observed when treating patients with other psychiatric disorders

Patients with a history of suicide related events, or those exhibiting a significant degree of suicidal ideation prior to commencement of treatment are known to be at greater risk of suicidal thoughts or suicide attempts, and should receive careful monitoring during treatment. A meta-analysis of placebo controlled clinical trials of antidepressant drugs in adult patients with psychiatric disorders showed an increased risk of suicidal behaviour with antidepressants compared to placebo in patients less than 25 years old.

Close supervision of patients and in particular those at high risk should accompany drug therapy especially in early treatment and following dose changes. Patients (and caregivers of patients) should be alerted about the need to monitor for any clinical worsening, suicidal behaviour or thoughts and unusual changes in behaviour and to seek medical advice immediately if these symptoms present.

In shorter-term placebo controlled clinical studies of patients with major depressive episodes in bipolar disorder an increased risk of suicide-related events was observed in young adults patients (younger than 25 years of age) who were treated with quetiapine as compared to those treated with placebo (3.0% vs. 0%, respectively). In clinical studies of patients with MDD the incidence of suicide-related events observed in young adult patients (younger than 25 years of age) was 2.1% (3/144) for quetiapine and 1.3%(1/75) for placebo.

Metabolic Risk:

Given the observed risk for worsening of their metabolic profile, including changes in weight, blood glucose (see hyperglycemia) and lipids, which was seen in clinical studies, patient’s metabolic parameters should be assessed at the time of treatment initiation and changes in these parameters should be regularly controlled for during the course of treatment. Worsening in these parameters should be managed as clinically appropriate (see also section 4.8).

Extrapyramidal symptoms:

In placebo controlled clinical trials of adult patients quetiapine was associated with an increased incidence of extrapyramidal symptoms (EPS) compared to placebo in patients treated for major depressive episodes in bipolar disorder and major depressive disorder (see sections 4.8 and 5.1).

The use of quetiapine has been associated with the development of akathisia, characterised by a subjectively unpleasant or distressing restlessness and need to move often accompanied by an inability to sit or stand still. This is most likely to occur within the first few weeks of treatment. In patients who develop these symptoms, increasing the dose may be detrimental.

Tardive Dyskinesia:

If signs and symptoms of tardive dyskinesia appear, dose reduction or discontinuation of Ebesque XL should be considered. The symptoms of tardive dyskinesia can worsen or even arise after discontinuation of treatment (see section 4.8).

Quetiapine treatment has been associated with somnolence and related symptoms, such as sedation (see section 4.8). In clinical trials for treatment of patients with bipolar depression and major depressive disorder, onset was usually within the first 3 days of treatment and was predominantly of mild to moderate intensity. Bipolar depression patients and patients with major depressive episodes in MDD experiencing somnolence of severe intensity may require more frequent contact for a minimum of 2 weeks from onset of somnolence, or until symptoms improve and treatment discontinuation may need to be considered.

Orthostatic Hypotension: Quetiapine treatment has been associated with orthostatic hypotension and related dizziness (see section 4.8) which, like somnolence has onset usually during the initial dose-titration period. This could increase the occurrence of accidental injury (fall), especially in the elderly population. Therefore, patients should be advised to exercise caution until they are familiar with the potential effects of the medication.

Ebesque XL should be used with caution in patients with known cardiovascular disease, cerebrovascular disease, or other conditions predisposing to hypotension. Dose reduction or more gradual titration should be considered if orthostatic hypotension occurs, especially in patients with underlying cardiovascular disease.

Seizures:

In controlled clinical trials there was no difference in the incidence of seizures in patients treated with quetiapine or placebo. No data is available about the incidence of seizures in patients with a history of seizure disorder. As with other antipsychotics, caution is recommended when treating patients with a history of seizures (see section 4.8).

Neuroleptic Malignant Syndrome:

Neuroleptic malignant syndrome has been associated with antipsychotic treatment, including quetiapine (see section 4.8). Clinical manifestations include hyperthermia, altered mental status, muscular rigidity, autonomic instability, and increased creatine phosphokinase. In such an event, Ebesque XL should be discontinued and appropriate medical treatment given.

Severe neutropenia and agranulocytosis:

Severe neutropenia (neutrophil count <0.5 X 10⁹/L) has been reported in quetiapine clinical trials. Most cases of severe neutropenia have occurred within a couple of months of starting therapy with quetiapine. There was no apparent dose relationship. During post-marketing experience, some cases were fatal. Possible risk factors for neutropenia include pre-existing low white blood cell count (WBC) and history of drug induced neutropenia. However, some

cases occurred in patients without pre-existing risk factors. Quetiapine should be discontinued in patients with a neutrophil count <1.0 X 10⁹/L. Patients should be observed for signs and symptoms of infection and neutrophil counts followed (until they exceed 1.5 X 10⁹/L). (See section 5.1).

Neutropenia should be considered in patients presenting with infection or fever, particularly in the absence of obvious predisposing factor(s), and should be managed as clinically appropriate.

Patients should be advised to immediately report the appearance of signs/symptoms consistent with agranulocytosis or infection (e.g., fever, weakness, lethargy, or sore throat) at any time during quetiapine therapy. Such patients should have a WBC count and an absolute neutrophil count (ANC) performed promptly, especially in the absence of predisposing factors.

Interactions:

4.5 Interaction with other medicinal products and other forms of interaction

Given the primary central nervous system effects of quetiapine, Ebesque XL should be used with caution in combination with other centrally acting medicinal products and alcohol.

Cytochrome P450 CYP3A4 is the enzyme that is primarily responsible for the cytochrome P450 mediated metabolism of quetiapine. In an interaction study in healthy volunteers, concomitant administration of quetiapine (dosage of 25 mg) with ketoconazole, a CYP3A4 inhibitor, caused a 5- to 8-fold increase in the AUC of quetiapine. On the basis of this, concomitant use of quetiapine with CYP3A4 inhibitors is contraindicated. It is also not recommended to consume grapefruit juice while on quetiapine therapy.

In a multiple dose trial in patients to assess the pharmacokinetics of quetiapine given before and during treatment with carbamazepine (a known hepatic enzyme inducer), co-administration of carbamazepine significantly increased the clearance of quetiapine. This increase in clearance reduced systemic quetiapine exposure (as measured by AUC) to an average of 13% of the exposure during administration of quetiapine alone; although a greater effect was seen in some patients. As a consequence of this interaction, lower plasma concentrations can occur, which could affect the efficacy of Ebesque XL therapy.

Co-administration of quetiapine and phenytoin (another microsomal enzyme inducer) caused a greatly increased clearance of quetiapine by approx. 450%. In patients receiving a hepatic enzyme inducer, initiation of Ebesque XL treatment should only occur if the physician considers that the benefits of Ebesque XL outweigh the risks of removing the hepatic enzyme inducer. It is important that any change in the inducer is gradual, and if required, replaced with a non-inducer (e.g. sodium valproate) (see section 4.4).

The pharmacokinetics of quetiapine were not significantly altered by coadministration of the antidepressants imipramine (a known CYP2D6 inhibitor) or fluoxetine (a known CYP3A4 and CYP2D6 inhibitor).

The pharmacokinetics of quetiapine were not significantly altered by coadministration of the antipsychotics risperidone or haloperidol. Concomitant use of quetiapine and thioridazine caused an increased clearance of quetiapine with approx. 70%.

The pharmacokinetics of quetiapine were not altered following co-administration with cimetidine.

The pharmacokinetics of lithium were not altered when co-administered with quetiapine.In a 6-week, randomized study of lithium and quetiapine prolonged-release tablets versus placebo and quetiapine prolonged-release tablets in adult patients with acute mania, a higher incidence of extrapyramidal related events (in particular tremor), somnolence and weight gain were observed in the lithium add-on group compared to the placebo add-on group (see section 5.1).

The pharmacokinetics of sodium valproate and quetiapine were not altered to a clinically relevant extent when co-administered. A retrospective study of children and adolescents who received valproate, quetiapine, or both, found a higher incidence of leucopenia and neutropenia in the combination group versus the monotherapy groups.

Formal interaction studies with commonly used cardiovascular medicinal products have not been performed.

Caution should be exercised when quetiapine is used concomitantly with medicinal products known to cause electrolyte imbalance or to increase QT interval.

There have been reports of false positive results in enzyme immunoassays for methadone and tricyclic antidepressants in patients who have taken quetiapine. Confirmation of questionable immunoassay screening results by an appropriate chromatographic technique is recommended.

4.6 Fertility, pregnancy and lactation

Pregnancy

First trimester

The moderate amount of published data from exposed pregnancies (i.e. between 3001000 pregnancy outcomes), including individual reports and some observational studies do not suggest an increased risk of malformations due to treatment. However, based on all available data, a definite conclusion cannot be drawn. Animal studies have shown reproductive toxicity (see section 5.3). Therefore, quetiapine should only be used during pregnancy if the benefits justify the potential risks.

Third trimester

Neonates exposed to antipsychotics (including quetiapine) during the third trimester of pregnancy are at risk of adverse reactions including extrapyramidal and/or withdrawal symptoms that may vary in severity and duration following delivery.

There have been reports of agitation, hypertonia, hypotonia, tremor, somnolence, respiratory distress, or feeding disorder. Consequently, newborns should be monitored carefully.

Breast-feeding

Based on very limited data from published reports on quetiapine excretion into human breast milk, excretion of quetiapine at therapeutic doses appears to be inconsistent. Due to lack of robust data, a decision must be made whether to discontinue breast-feeding or to discontinue Ebesque XL therapy taking into account the benefit of breast-feeding for the child and the benefit of therapy for the woman.

Fertility

The effects of quetiapine on human fertility have not been assessed. Effects related to elevated prolactin levels were seen in rats, although these are not directly relevant to humans (see section 5.3 preclinical data).

4.7 Effects on ability to drive and use machines

Given its primary central nervous system effects, quetiapine may interfere with activities requiring mental alertness. Therefore, patients should be advised not to drive or operate machinery, until individual susceptibility to this is known.

4.8 Undesirable effects

The most commonly reported Adverse Drug Reactions (ADRs) with quetiapine (>10%) are somnolence, dizziness, headache, dry mouth, withdrawal (discontinuation) symptoms , elevations in serum triglycerides levels, elevations in total cholesterol (predominantly LDL cholesterol), decreases of HDL cholesterol, weight gain, decreased haemoglobin and extrapyramidal symptoms.

The incidences of ADRs associated with quetiapine therapy, are tabulated below according to the format recommended by the Council for International Organizations of Medical Sciences (CIOMS III Working Group 1995).

The frequencies of adverse events are ranked according to the following: Very common (>1/10), common (>1/100, <1/10), uncommon (>1/1000, <1/100), rare (>1/10,000, <1/1000) and very rare (<1/10,000), not known (cannot be estimated from the available data).
Blood and lymphatic system disorders
Very common	22 Decreased haemoglobin
Common:	Leucopenia ^1,28 Decreased neutrophil count, Eosinophils increased²⁷
Uncommon:	13 Thrombocytopenia, Anaemia, Platelet count decreased
Rare	Agranulocytosis²⁶
Not known:	Neutropenia ¹
Immune system disorders
Uncommon:	Hypersensitivity (including allergic skin reactions)
Very rare:	Anaphylactic reaction ⁵
Endocrine disorders
Common:	Hyperprolactinaemia¹⁵ , decreases in total T₄ ²⁴, decreases in free T₄ ²⁴, decreases in total T₃ ²⁴, increases in TSH²⁴
Uncommon	Decreases in Free T₃²⁴, Hypothyroidism²¹
Very rare:	Inappropriate antidiuretic hormone secretion
Metabolism and nutrition disorders
Very common:	Elevations in serum triglyceride levels ^10,31Elevations in total cholesterol (predominantly LDL cholesterol)^11,30 Decreases in HDL cholesterol^17,30, Weight gain ^8,30
Common:	Increased appetite, Blood glucose increased to hyperglycaemic levels^6,30
Uncommon:	Hyponatraemia¹⁹, Diabetes Mellitus^1,5
Rare:	Metabolic syndrome²⁹
Not Known:	Exacerbation of pre-existing diabetes

Psychiatric disorders
Common:	Abnormal dreams and nightmares, Suicidal ideation and suicidal behaviour ²⁰
Rare	Somnambulism and related reactions such as sleep talking and sleep related eating disorder
Nervous system disorders
Very Common:	Dizziness^{4, 16} , Somnolence ^{2 16} , Headache, Extrapyramidal 1 21 symptoms ^,
Common:	Dysarthria
Uncommon:	Seizure¹ , Restless legs syndrome, Tardive dyskinesia ^{1 5}Syncope ^{4 16}
Cardiac disorders
Common:	Tachycardia⁴ ,Palpitations²³
Uncommon:	QT prolongation^1,12,18 ,Bradycardia³²
Eye disorders
Common:	Vision blurred
Vascular disorders
Common:	Orthostatic hypotension ^{4 16}
Rare	Venous thromboembolism¹
Respiratory, thoracic and mediastinal disorder
Common:	23 Dyspnea
Uncommon	Rhinitis
Gastrointestinal disorders
Very Common:	Dry mouth
Common:	25 Constipation, Dyspepsia, Vomiting
Uncommon:	Dysphagia ⁷
Rare	Pancreatitis¹, Intestinal obstruction/Ileus

Hepato-biliary disorders

Common	3 Elevations in serum alanine amino transferases (ALT) , Elevations in gamma-GT levels^{1 2 3 4}
Uncommon	3 Elevations in serum aspartate amino transferases (AST)
Rare:	Jaundice⁵, Hepatitis
Skin and subcutaneous tissue disorders
Very rare:	Angioedema⁵ , Stevens-Johnson syndrome⁵
Not known	Toxic Epidermal Necrolysis, Erythema Multiforme
Musculoskeletal and connective tissue disorders
Very rare:	Rhabdomyolysis
Renal and urinary disorders
Uncommon:	Urinary retention
Pregnancy, puerperium and perinatal conditions
Not known:	31 Drug withdrawal syndrome neonatal
Reproductive system and breast disorders
Uncommon:	Sexual dysfunction
Rare:	Priapism, Galactorrhoea, Breast swelling, Menstrual r\ 1 c/urH c>r
General disorders and administration site conditions
Very common	Withdrawal (discontinuation) symptoms ^{1 9}
Common:	Mild asthenia, Peripheral oedema, Irritability, Pyrexia
Rare:	Neuroleptic malignant syndrome ¹, Hypothermia
Investigations
Rare:	Elevations in blood creatine phosphokinase ¹⁴

reversible on continued quetiapine treatment.

(4) As with other antipsychotics with alpha! adrenergic blocking activity, quetiapine may commonly induce orthostatic hypotension, associated with dizziness, tachycardia and, in some patients, syncope, especially during the initial dose-titration period. (See section 4.4).

(5) Calculation of Frequency for these ADRs have only been taken from postmarketing data with the immediate-release formulation of quetiapine.

(6) Fasting blood glucose >126mg/dl (^7.0 mmol/1) or a non fasting blood glucose>200 mg/dl (^11.1 mmol/1) on at least one occasion.

(7) An increase in the rate of dysphagia with quetiapine vs. placebo was only observed in the clinical trials in bipolar depression.

(8) Based on >7% increase in body weight from baseline. Occurs predominantly during the early weeks of treatment in adults.

(9) The following withdrawal symptoms have been observed most frequently in acute placebo-controlled, monotherapy clinical trials, which evaluated discontinuation symptoms: insomnia, nausea, headache, diarrhoea, vomiting, dizziness, and irritability. The incidence of these reactions had decreased significantly after ! week post-discontinuation.

(10) Triglycerides ^200 mg/dl (^2.258 mmol/1) (patients ^ 18 years of age) or ^150 mg/dl (^ 1.694 mmol/1) (patients <18 years of age) on at least one occasion.

(11) Cholesterol ^240 mg/dl (^6.2064 mmol/1) (patients k 18 years of age) or ^200 mg/dl (^5.172 mmol/1) (patients <18 years of age) on at least one occasion. An increase in LDL cholesterol of ^30 mg/dl (^0.769 mmol/1) has been very commonly observed. Mean change among patients who had this increase was 41.7 mg/dl (^1.07 mmol/1).

(12) See text below.

(13) Platelets < 100 x 10⁹/l on at least one occasion.

(14) Based on clinical trial adverse event reports of blood creatine phosphokinase increase not associated with neuroleptic malignant syndrome.

(15) Prolactin levels (patients>18 years of age):>20 pg/l (>869.56 pmol/l) males;>30pg/l (>1304.34 pmol/l) females at any time.

(16) May lead to falls.

(17) HDL cholesterol: <40 mg/dl (1.025 mmol/l) males; <50 mg/dl (1.282 mmol/l) females at any time.

(18) Incidence of patients who have a QTc shift from <450 msec to >450 msec with a >30 msec increase. In placebo-controlled trials with quetiapine the mean change and the incidence of patients who have a shift to a clinically significant level is similar between quetiapine and placebo.

(19) Shift from >132 mmol/l to <132 mmol/l on at least one occasion.

(20) Cases of suicidal ideation and suicidal behaviours have been reported during quetiapine therapy or early after treatment discontinuation (see sections 4.4 and 5.1).

(21) See section 5.1

(22) Decreased haemoglobin to <13 g/dl (8.07 mmol/l) males, <12 g/dl (7.45 mmol/l) females on at least one occasion occurred in 11% of quetiapine patients in all trials including open label extensions. For these patients, the mean maximum decrease in hemoglobin at any time was -1.50 g/dl.

(23) These reports often occurred in the setting of tachycardia, dizziness, orthostatic hypotension and/or underlying cardiac/respiratory disease.

(24) Based on shifts from normal baseline to potentially clinically important value at any time post-baseline in all trials. Shifts in total T₄, free T₄, total T₃and free T₃ are defined as <0.8 x LLN (pmol/L) and shift in TSH is >5 mIU/L at any time.

(25) Based upon the increased rate of vomiting in older patients (>65 years of age).

(26) Based on shifts in neutrophils from >1.5 x 10⁶/L at baseline to <0.5 x 10⁶/L at any time during treatment and based on patients with severe neutropenia (< 0,5 x 10⁶/l) and infection during all clinical studies with quetiapine (see section 4.4).

(27) Based on shifts from normal baseline to potentially clinically important value at any time post-baseline in all trials. Shifts in eosinophils are defined as >1 x 10⁶ cells/L at any time.

(28) Based on shifts from normal baseline to potentially clinically important value at any time post-baseline in all trials. Shifts in WBCs are defined as <3 x 10⁶ cells/L at any time.

(29) Based on adverse event reports of metabolic syndrome from all clinical trials with quetiapine.

(30) In some patients, a worsening of more than one of the metabolic factors of weight, blood glucose and lipids was observed in clinical studies (see section 4.4)

(31) See section 4.6.

(32) May occur at or near initiation of treatment and be associated with hypotension and/or syncope. Frequency based on adverse event reports of bradycardia and related events in all clinical trials with quetiapine.

Cases of QT prolongation, ventricular arrhythmia, sudden unexplained death, cardiac arrest and torsades de pointes have been reported with the use of neuroleptics and are considered class effects.

Children and adolescents (10 to 17 years of age):

The same ADRs described above for adults should be considered for children and adolescents. The following table summarises ADRs that occur in a higher frequency category in children and adolescent patients (10-17 years of age) than in the adult population or ADRs that have not been identified in the adult population.

The frequencies of adverse events are ranked according to the following: Very common (>1/10), common (>1/100, <1/10), uncommon (>1/1000, <1/100), rare (>1/10,000, <1/1000) and very rare (<1/10,000).

Very

Elevations in prolactin

Metabolism and nutrition disorders
Very	Increased appetite
Nervous system disorders
Very common•	Extrapyramidal symptoms³’⁴
Common:	Syncope
Vascular disorders
Very cojjjjjjyvn •	2 Increases in blood pressure
Respiratory, thoracic and mediastinal disorders
Common:	Rhinitis
Gastrointestinal disorders
Very crmwnnn •	Vomiting
General disorders and administration site conditions
Common:	Irritability³

(1) Prolactin levels (patients <18 years of age): >20 pg/l (>869.56 pmol/l) males; >26 pg/l (>1130.428 pmol/l) females at any time. Less than 1% of patients had an increase to a prolactin level >100 pg/l.

(2) Based on shifts above clinically significant thresholds (adapted from the National Institute of Health criteria) or increases >20mmHg for systolic or >10 mmHg for diastolic blood pressure at any time in two acute (3-6 weeks) placebo-controlled trials in children and adolescents.

(3) Note: The frequency is consistent to that observed in adults, but irritability might be associated with different clinical implications in children and adolescents as compared to adults.

(4) See section 5.1.

Reporting of suspected adverse reactions:

Reporting suspected adverse reactions after authorisation of the medicinal product is important. It allows continued monitoring of the benefit/risk balance of the medicinal product. Healthcare professionals are asked to report any suspected adverse reactions via www.mhra.gov.uk/yellowcard.

4.9 Overdose Symptoms

In general, reported signs and symptoms were those resulting from an exaggeration of the active substance's known pharmacological effects, i.e. drowsiness and sedation, tachycardia and hypotension.

Overdose can lead to QT-prolongation, seizures, status epilepticus, rhabdomyolysis, respiratory depression, urinary retention, confusion, delirium and/or agitation, coma and death.

Patients with pre-existing severe cardiovascular disease may be at an increased risk of the effects of overdose. (See section 4.4, Orthostatic hypotension).

Management of overdose

There is no specific antidote to quetiapine. In cases of severe signs, the possibility of multiple drug involvement should be considered, and intensive care procedures are recommended, including establishing and maintaining a patent airway, ensuring adequate oxygenation and ventilation, and monitoring and support of the cardiovascular system.

According to the published literature, patients with delirium and agitation and a positive anticholinergic syndrome can be treated (under continuous ECG monitoring) with 1-2 mg physostigmine. This treatment is not recommended as a standard therapy due to the potentially negative effect of physostigmine on stimulus conduction of the heart. Treatment with physostigmine can be considered if there are no deviations in the ECG. Physostigmine should not be used in the event of cardiac arrhythmias, heart block of any degree or QRS widening.

Whilst the prevention of absorption in overdose has not been investigated, gastric lavage can be indicated in severe poisonings and if possible to perform within one hour of ingestion. The administration of activated charcoal should be considered.

In cases of quetiapine overdose refractory hypotension should be treated with appropriate measures such as intravenous fluids and/or sympathomimetic agents (epinephrine and dopamine should be avoided, since beta stimulation may worsen hypotension in the setting of quetiapine-induced alpha blockade).

Close medical supervision and monitoring should be continued until the patient recovers.

5 PHARMACOLOGICAL PROPERTIES

5.1 Pharmacodynamic properties

Pharmacotherapeutic group: Psycholeptics, antipsychotics; diazepines, oxazepines, thiazepines and oxepines.

ATC code: N05A H04

Mechanism of action:

Quetiapine is an atypical antipsychotic agent. Quetiapine and the active human plasma metabolite, norquetiapine interact with a broad range of neurotransmitter receptors. Quetiapine and norquetiapine exhibit affinity for brain serotonin (5HT₂) and dopamine D^ and D₂-receptors. It is this combination of receptor antagonism with a higher selectivity for 5HT₂ relative to D2-receptors, which is believed to contribute to the clinical antipsychotic properties and low extrapyramidal undesirable effect (EPS) liability of quetiapine compared to typical antipsychotics. Additionally, norquetiapine has high affinity for the norepinephrine transporter (NET). Quetiapine and norquetiapine also have high affinity at histaminergic and adrenergic ai-receptors, with a lower affinity at adrenergic a₂- and serotonin 5HT₁A receptors. Quetiapine has no appreciable affinity at muscarinic or benzodiazepine receptors.

Pharmacodynamic effects:

Quetiapine is active in tests for antipsychotic activity, such as conditioned avoidance. It also blocks the action of dopamine agonists, measured either behaviourally or electrophysiologically, and elevates dopamine metabolite concentrations, a neurochemical index of D₂-receptor blockade.

In pre-clinical tests predictive of EPS, quetiapine is unlike typical antipsychotics and has an atypical profile. Quetiapine does not produce dopamine D₂-receptor supersensitivity after chronic administration. Quetiapine produces only weak catalepsy at effective dopamine D2-receptor blocking doses. Quetiapine demonstrates selectivity for the limbic system by producing depolarisation blockade of the mesolimbic but not the nigrostriatal dopamine-containing neurones following chronic administration. Quetiapine exhibits minimal dystonic liability in haloperidol-sensitised or drug-naive Cebus monkeys after acute and chronic administration. (see section 4.8).

Clinical efficacy:

Schizophrenia

The efficacy of quetiapine prolonged-release in the treatment of schizophrenia was demonstrated in one 6-week placebo-controlled trial in patients who met DSM-IV criteria for schizophrenia, and one active-controlled quetiapine immediate-release-to- quetiapine prolonged-release switching study in clinically stable outpatients with schizophrenia.

The primary outcome variable in the placebo-controlled trial was change from baseline to final assessment in the PANSS total score. Quetiapine prolonged-release tablets 400 mg/day, 600 mg/day and 800 mg/day were associated with statistically significant improvements in psychotic symptoms compared to placebo. The effect size of the 600 mg and 800 mg doses was greater than that of the 400 mg dose.

In the 6-week active-controlled switching study the primary outcome variable was the proportion of patients who showed lack of efficacy, i.e., who discontinued study treatment due to lack of efficacy or whose PANSS total score increased 20% or more from randomisation to any visit. In patients stabilised on quetiapine immediate release 400 mg to 800 mg, efficacy was maintained when patients were switched to an equivalent daily dose of quetiapine prolonged-release tablets given once daily.

In a long-term study in stable schizophrenic patients who had been maintained on quetiapine prolonged-release tablets for 16 weeks, quetiapine prolonged-release tablets were more effective than placebo in preventing relapse. The estimated risks of relapse after 6 months treatments was 14.3% for the quetiapine prolonged-release treatment group compared to 68.2% for placebo. The average dose was 669 mg.

There were no additional safety findings associated with treatment with quetiapine prolonged-release tablets for up to 9 months (median 7 months). In particular, reports of adverse events related to EPS and weight gain did not increase with longer-term treatment with quetiapine prolonged-release tablets.

Bipolar disorder

In the treatment of moderate to severe manic episodes, quetiapine demonstrated superior efficacy to placebo in reduction of manic symptoms at 3 and 12 weeks, in two monotherapy trials. The efficacy of quetiapine prolonged-release tablets was further demonstrated with significance versus placebo in an additional 3 week study. Quetiapine prolonged-release tablets were dosed in the range of 400 mg to 800 mg/day and the mean dose was approximately 600 mg/day. Quetiapine data in combination with divalproex or lithium in acute moderate to severe manic episodes at 3 and 6 weeks is limited; however, combination therapy was well tolerated. The data showed an additive effect at week 3. A second study did not demonstrate an additive effect at week 6.

In a clinical trial, in patients with depressive episodes in bipolar I or bipolar II disorder, quetiapine prolonged-release tablets 300 mg/day showed superior efficacy to placebo in reduction of MADRS total score.

In 4 additional clinical trials with quetiapine, with a duration of 8 weeks in patients with moderate to severe depressive episodes in bipolar I or bipolar II disorder, Quetiapine immediate-release tablets 300 mg and 600 mg were significantly superior to placebo treated patients for the relevant outcome measures: mean improvement on the MADRS and for response defined as at least a 50% improvement in MADRS total score from baseline. There was no difference in magnitude of effect between the patients who received 300 mg quetiapine immediate release and those who received 600 mg dose.

In the continuation phase in two of these studies, it was demonstrated that longterm treatment, of patients who responded on quetiapine immediate-release 300 mg or 600 mg, was efficacious compared to placebo treatment with respect to depressive symptoms, but not with regard to manic symptoms.

In two recurrence prevention studies evaluating quetiapine in combination with mood stabilizers, in patients with manic, depressed or mixed mood episodes, the combination with quetiapine was superior to mood stabilizers monotherapy in increasing the time to recurrence of any mood event (manic, mixed or depressed). Quetiapine was administered twice-daily totalling 400 mg to 800 mg a day as combination therapy to lithium or valproate.

In one long-term study (up to 2 years treatment) evaluating recurrence prevention in patients with manic, depressed or mixed mood episodes quetiapine was superior to placebo in increasing the time to recurrence of any mood event (manic, mixed or depressed), in patients with bipolar I disorder.

The number of patients with a mood event was 91 (22.5%) in the quetiapine group, 208 (51.5%) in the placebo group and 95 (26.1%) in the lithium treatment groups respectively. In patients who responded to quetiapine, when comparing continued treatment with quetiapine to switching to lithium, the results indicated that a switch to lithium treatment does not appear to be associated with an increased time to recurrence of a mood event.

Major depressive episodes in MDD

Two short-term (6 week) studies enrolled patients who had shown an inadequate response to at least one antidepressant. Quetiapine prolonged-release tablets 150 mg and 300 mg/day, given as add-on treatment to ongoing antidepressant therapy (amitriptyline, bupropion, citalopram, duloxetine, escitalopram, fluoxetine, paroxetine, sertraline or venlafaxine) demonstrated superiority over antidepressant therapy alone in reducing depressive symptoms as measured by improvement in MADRS total score (LS mean change vs. placebo of 2-3.3 points).

Long-term efficacy and safety in patients with MDD has not been evaluated as add-on therapy, however long-term efficacy and safety has been evaluated in adult patients as monotherapy (see below).

The following studies were conducted with quetiapine prolonged-release as monotherapy treatment, however quetiapine prolonged-release tablets are only indicated for use as add-on therapy.

In three out of four short term (up to 8 weeks) monotherapy studies, in patients with major depressive disorder, quetiapine prolonged-release 50 mg, 150 mg and 300 mg/day demonstrated superior efficacy to placebo in reducing depressive symptoms as measured by improvement in the Montgomery-Asberg Depression Rating Scale (MADRS) total score (LS mean change vs. placebo of 2-4 points).

In a monotherapy relapse prevention study, patients with depressive episodes stabilised on open-label quetiapine prolonged-release treatment for at least 12 weeks were randomised to either quetiapine prolonged-release once daily or placebo for up to 52 weeks. The mean dose of quetiapine prolonged-release during the randomised phase was 177 mg/day. The incidence of relapse was 14.2% for quetiapine prolonged-release treated patients and 34.4% for placebo-treated patients.

In a short-term (9 week) study non-demented older patients (aged 66 to 89 years) with major depressive disorder, quetiapine prolonged-release dosed flexibly in the range of 50 mg to 300 mg/day demonstrated superior efficacy to placebo in reducing depressive symptoms as measured by improvement in MADRS total score (LS mean change vs placebo -7.54). In this study patients randomised to quetiapine prolonged-release received 50 mg/day on Days 1-3, the dose could be increased to 100 mg/day on Day 4, 150 mg/day on Day 8 and up to 300 mg/day depending on clinical response and tolerability. The mean dose of quetiapine prolonged-release was 160 mg/day.

Other than the incidence of extrapyramidal symptoms (see section 4.8 and ‘Clinical Safety’ below) the tolerability of quetiapine prolonged-release once daily in older patients was comparable to that seen in adults (aged 18-65 years). The proportion of randomized patients over 75 years of age was 19%.

Clinical safety

In short-term, placebo-controlled clinical trials in schizophrenia and bipolar mania the aggregated incidence of extrapyramidal symptoms was similar to placebo (schizophrenia: 7.8% for quetiapine and 8.0% for placebo; bipolar mania: 11.2% for quetiapine and 11.4% for placebo). Higher rates of extrapyramidal symptoms were seen in quetiapine treated patients compared to those treated with placebo in short- term, placebo-controlled clinical trials in MDD and bipolar depression. In short-term, placebo-controlled bipolar depression trials the aggregated incidence of extrapyramidal symptoms was 8.9% for quetiapine compared to 3.8% for placebo. In short-term, placebo-controlled monotherapy clinical trials in major depressive disorder the aggregated incidence of extrapyramidal symptoms was 5.4% for quetiapine prolonged-release and 3.2% for placebo. In a short-term placebo- controlled monotherapy trial in older patients with major depressive disorder, the aggregated incidence of extrapyramidal symptoms was 9.0% for quetiapine prolonged-release and 2.3% for placebo. In both bipolar depression and MDD, the incidence of the individual adverse events (eg, akathisia, extrapyramidal disorder, tremor, dyskinesia, dystonia, restlessness, muscle contractions involuntary, psychomotor hyperactivity and muscle rigidity) did not exceed 4% in any treatment group.

In short term, fixed dose (50mg/d to 800 mg/d), placebo-controlled studies (ranging from 3 to 8 weeks), the mean weight gain for quetiapine-treated patients ranged from 0.8 kg for the 50 mg daily dose to 1.4 kg for the 600 mg daily dose (with lower gain for the 800 mg daily dose), compared to 0.2 kg for the placebo treated patients. The percentage of quetiapine treated patients who gained >7% of body weight ranged from 5.3% for the 50 mg daily dose to 15.5% for the 400 mg daily dose (with lower gain for the 600 mg and 800 mg daily doses), compared to 3.7% for placebo treated patients.

A 6-week, randomized study of lithium and quetiapine prolonged-release tablets versus placebo and quetiapine prolonged-release tablets in adult patients with acute mania indicated that the combination of quetiapine prolonged-release tablets with lithium leads to more adverse events (63% versus 48% in quetiapine prolonged-release tablets in combination with placebo). The safety results showed a higher incidence of extrapyramidal symptoms reported in 16.8% of patients in the lithium add-on group and 6.6% in the placebo add-on group, the majority of which consisted of tremor, reported in 15.6% of the patients in the lithium add-on group and 4.9% in the placebo add-on group. The incidence of somnolence was higher in the quetiapine prolonged-release tablets with lithium add-on group (12.7%) compared to the quetiapine prolonged-release tablets with placebo add-on group (5.5%). In addition, a higher percentage of patients treated in the lithium add-on group (8.0%) had weight gain (> 7%) at the end of treatment compared to patients in the placebo add-on group (4.7%).

Longer term relapse prevention trials had an open label period (ranging from 4 to 36 weeks) during which patients were treated with quetiapine, followed by a randomized withdrawal period during which patients were randomized to quetiapine or placebo. For patients who were randomized to quetiapine, the mean weight gain during the open label period was 2.56 kg, and by week 48 of the randomized period, the mean weight gain was 3.22 kg, compared to open label baseline. For patients who were randomized to placebo, the mean weight gain during the open label period was 2.39 kg, and by week 48 of the randomized period the mean weight gain was 0.89 kg, compared to open label baseline.

In placebo-controlled studies in older patients with dementia-related psychosis, the incidence of cerebrovascular adverse events per 100 patient years was not higher in quetiapine-treated patients than in placebo-treated patients.

In all short-term placebo-controlled monotherapy trials in patients with a baseline neutrophil count >1.5 X 10⁹/L, the incidence of at least one occurrence of a shift to neutrophil count <1.5 X 10⁹/L, was 1.9% in patients treated with quetiapine compared to 1.5% in placebo-treated patients. The incidence of shifts to >0.5 - <1.0 X 10⁹/L was the same (0.2%) in patients treated with quetiapine as with placebo-treated patients. In all clinical trials (placebo-controlled, open-label, active comparator) in patients with a baseline neutrophil count >1.5 X 10⁹/L, the incidence of at least one occurrence of a shift to neutrophil count <1.5 X 10⁹/L was 2.9% and to <0.5 X 10⁹/L was 0.21% in patients treated with quetiapine.

Quetiapine treatment was associated with dose-related decreases in thyroid hormone levels. The incidence of shifts in TSH was 3.2% for quetiapine versus 2.7% for placebo. The incidence of reciprocal, potentially clinically significant shifts of both T₃ or T₄ and TSH in these trials were rare, and the observed changes in thyroid hormone levels were not associated with clinically symptomatic hypothyroidism. The reduction in total and free T4 was maximal within the first six weeks of quetiapine treatment, with no further reduction during long-term treatment. For about 2/3 of all cases, cessation of quetiapine treatment was associated with a reversal of the effects on total and free T₄, irrespective of the duration of treatment.

Cataracts/lens opacities

In a clinical trial to evaluate the cataractogenic potential of quetiapine (200-800 mg/day) versus risperidone (2-8 mg/day) in patients with schizophrenia or schizoaffective disorder, the percentage of patients with increased lens opacity grade was not higher in quetiapine (4%) compared with risperidone (10%), for patients with at least 21 months of exposure.

Children and adolescents (10 to 17 years of age)

Clinical efficacy

The efficacy and safety of quetiapine IR was studied in a 3-week placebo controlled study for the treatment of mania (n= 284 patients from the US, aged 10-17). About 45% of the patient population had an additional diagnosis of ADHD. In addition, a 6 week placebo controlled study for the treatment of schizophrenia (n = 222 patients, aged 13-17) was performed. In both studies, patients with known lack of response to quetiapine IR were excluded.

Treatment with quetiapine IR was initiated at 50 mg/day and on day 2 increased to 100 mg/day; subsequently the dose was titrated to a target dose (mania 400600 mg/day; schizophrenia 400-800 mg/day) using increments of 100 mg/day given two or three times daily.

In the mania study, the difference in LS mean change from baseline in YMRS total score (active minus placebo) was -5.21 for quetiapine IR 400 mg/day and -6.56 for quetiapine IR 600 mg/day. Responder rates (YMRS improvement > 50%) were 64% for quetiapine IR 400 mg/day, 58% for 600 mg/day and 37% in the placebo arm.

In the schizophrenia study, the difference in LS mean change from baseline in PANSS total score (active minus placebo) was -8.16 for quetiapine IR 400 mg/day and -9.29 for quetiapine IR 800 mg/day. Neither low dose (400 mg/day) nor high dose regimen (800 mg/day) quetiapine was superior to placebo with respect to the percentage of patients achieving response, defined as > 30% reduction from baseline in PANSS total score. Both in mania and schizophrenia higher doses resulted in numerically lower response rates.In a third short-term placebo-controlled monotherapy trial with quetiapine prolonged-release tablets in children and adolescent patients (10-17 years of age) with bipolar depression, efficacy was not demonstrated.

No data are available on maintenance of effect or recurrence prevention in this age group.

Clinical safety

In the short-term paediatric trials with quetiapine described above, the rates of EPS in the active arm vs. placebo were 12.9% vs. 5.3% in the schizophrenia trial, 3.6% vs. 1.1% in the bipolar mania trial, and 1.1% vs. 0% in the bipolar depression trial. The rates of weight gain >7% of baseline body weight in the active arm vs. placebo were 17% vs. 2.5% in the schizophrenia and bipolar mania trials, and 12.5% vs. 6% in the bipolar depression trial. The rates of suicide related events in the active arm vs. placebo were 1.4% vs. 1.3% in the schizophrenia trial, 1.0% vs. 0% in the bipolar mania trial, and 1.1% vs. 0% in the bipolar depression trial. During an extended post-treatment follow-up phase of the bipolar depression trial, there were two additional suicide related events in two patients; one of these patients was on quetiapine at the time of the event. Long-term safety

A 26-week open-label extension to the acute trials (n= 380 patients), with quetiapine IR flexibly dosed at 400 mg - 800 mg/day, provided additional safety data. Increases in blood pressure were reported in children and adolescents and increased appetite, extrapyramidal symptoms and elevations in serum prolactin were reported with higher frequency in children and adolescents than in adult patients (see section 4.4 and 4.8).

With respect to weight gain, when adjusting for normal growth over the longer term, an increase of at least 0.5 standard deviation from baseline in Body Mass Index (BMI) was used as a measure of a clinically significant change; 18.3% of patients who were treated with quetiapine for at least 26 weeks met this criterion.

5.2 Pharmacokinetic properties Absorption:

Quetiapine is well absorbed following oral administration. Quetiapine prolonged-release achieves peak quetiapine and norquetiapine plasma concentrations at approximately 6 hours after administration (Tmax). Steady-state peak molar concentrations of the active metabolite norquetiapine are 35% of that observed for quetiapine.

The pharmacokinetics of quetiapine and norquetiapine are linear and dose-proportional for doses up to 800 mg administered once daily. When quetiapine prolonged-release administered once daily is compared to the same total daily dose of immediate-release quetiapine fumarate (quetiapine immediate-release) administered twice daily, the area under the plasma concentration-time curve (AUC) is equivalent but the maximum plasma concentration (Cmax) is 13% lower at steady state. When quetiapine prolonged-release is compared to quetiapine immediate-release, the norquetiapine metabolite AUC is 18% lower.

In a study examining the effects of food on the bioavailability of quetiaine, a high-fat meal was found to produce statistically significant increases in the quetiapine prolonged-release Cmax and AUC of approximately 50% and 20% respectively. It cannot be excluded that the effect of a high fat meal on the formulation may be larger. In comparison, a light meal had no significant effect on the Cmax or AUC of quetiapine. It is recommended that quetiapine prolonged-release is taken once daily without food.

Distribution:

Quetiapine is approximately 83% bound to plasma proteins.

Biotransformation:

Quetiapine is extensively metabolised by the liver, with parent compound accounting for less than 5% of unchanged drug-related material in the urine or faeces, following the administration of radiolabelled quetiapine.

In vitro investigations established that CYP3A4 is the primary enzyme responsible for cytochrome P450 mediated metabolism of quetiapine. Norquetiapine is primarily formed and eliminated via CYP3A4.

Quetiapine and several of its metabolites (including norquetiapine) were found to be weak inhibitors of human cytochrome P450 1A2, 2C9, 2C19, 2D6 and 3A4 activities in vitro. In vitro CYP inhibition is observed only at concentrations approximately 5 to 50 fold higher than those observed at a dose range of 300 mg to 800 mg/day in humans. Based on these in vitro results, it is unlikely that co-administration of quetiapine with other drugs will result in clinically significant drug inhibition of cytochrome P450 mediated metabolism of the other drug. From animal studies it appears that quetiapine can induce cytochrome P450 enzymes. In a specific interaction study in psychotic patients, however, no increase in the cytochrome P450 activity was found after administration of quetiapine.

Elimination:

The elimination half lives of quetiapine and norquetiapine are approximately 7 and 12 hours, respectively. Approximately 73% of a radiolabelled drug was excreted in the urine and 21% in the faeces with less than 5% of the total radioactivity representing unchanged drug-related material. The average molar dose fraction of free quetiapine and the active human plasma metabolite norquetiapine is <5% excreted in the urine.

Special populations

Gender:

The pharmacokinetics of quetiapine does not differ between men and women. Older people:

The mean clearance of quetiapine in the older people is approximately 30 to 50% lower than that seen in adults aged 18 to 65 years.

Renal impairment:

The mean plasma clearance of quetiapine was reduced by approximately 25% in subjects with severe renal impairment (creatinine clearance less than 30 ml/min/1.73 m²), but the individual clearance values are within the range for normal subjects.

Hepatic impairment:

The mean quetiapine plasma clearance decreases with approximately 25% in persons with known hepatic impairment (stable alcohol cirrhosis). As quetiapine is extensively metabolised by the liver, elevated plasma levels are expected in the population with hepatic impairment. Dose adjustments may be necessary in these patients (see section 4.2).

Children and adolescents (10 to 17 years of age):

Pharmacokinetic data were sampled in 9 children aged 10-12 years old and 12 adolescents, who were on steady-state treatment with 400 mg quetiapine IR twice daily. At steady-state, the dose-normalised plasma levels of the parent compound quetiapine, in children and adolescents (10-17 years of age) were in general similar to adults, though Cmax in children was at the higher end of the range observed in adults. The AUC and Cmax for the active metabolite, norquetiapine, were higher, approximately 62% and 49% in children (10-12 years), respectively and 28% and 14% in adolescents (13-17 years), respectively, compared to adults.

No information is available for quetiapine prolonged-release in children and adolescents.

5.3 Preclinical safety data

There was no evidence of genotoxicity in a series of in vitro and in vivo genotoxicity studies. In laboratory animals at a clinically relevant exposure level the following deviations were seen, which as yet have not been confirmed in long-term clinical research.

In rats, pigment deposition in the thyroid gland has been observed; in cynomolgus monkeys thyroid follicular cell hypertrophy, a lowering in plasma T₃ levels, decreased haemoglobin concentration and a decrease of red and white blood cell count have been observed; and in dogs lens opacity and cataracts. (For cataracts/lens opacities see section 5.1).In a toxicity study in rabbits for embryo-fetal development an increased incidence of carpal/tarsal flexures was observed in the fetus. This effect was observed in apparent effects on the part of the mother, such as decreased weight gain. These effects appeared at exposures, which were 4 times higher than that in humans within the maximum therapeutic dose. The relevance of these findings for humans is unknown. In a fertility study in rats, a marginally reduced fertility in males and phantom pregnancies, prolonged dioestrum periods, extended precoital interval and reduced pregnancy rates were observed. These effects are due to increased prolactin levels. Because of the species differences they are not directly relevant for humans in relation to the hormonal control of reproduction.

Taking these findings into consideration, the benefits of the treatment with quetiapine need to be balanced against the safety risks for the patient.

6 PHARMACEUTICAL PARTICULARS

6.1 List of excipients

Core:

Lactose monohydrate Cellulose, microcrystalline Magnesium oxide, light Carrageenan lambda Povidone (K-30)

Magnesium stearate Film-coating:

Carrageenan lambda Titanium dioxide (E 171)

Macrogol 400

Ferric oxide yellow (E 172)

Imprinting:

Black ink (contains shellac glaze, iron oxide black (E172) and propylene glycol)

6.2 Incompatibilities

Not applicable.

6.3 Shelf life

36 months.

6.4 Special precautions for storage

This medicinal product does not require any special storage conditions.

6.5 Nature and contents of container

PVC/PVDC-Aluminium blisters in folding cartons OPA/Al/PVC-Aluminium blisters in folding cartons Pack sizes: 10, 50, 60, 100 prolonged-release tablets Not all pack sizes may be marketed.

6.6 Special precautions for disposal

Any unused product or waste material should be disposed of in accordance with local requirements.

7 MARKETING AUTHORISATION HOLDER

Dallas Burston Ashbourne Ltd The Rectory, Braybrooke Rd Arthingworth, Market Harborough

LE16 8JT, United Kingdom Telephone: (01858) 525643 Fax:(01858) 525383 Email: enquiries@medinformation.co.uk

8 MARKETING AUTHORISATION NUMBER(S)

PL 20311/0028

9 DATE OF FIRST AUTHORISATION/RENEWAL OF THE AUTHORISATION

28/07/2014

10 DATE OF REVISION OF THE TEXT

22/09/2015

See section 4.4

Somnolence may occur, usually during the first two weeks of treatment and generally resolves with the continued administration of quetiapine.

Asymptomatic elevations (shift from normal to >3 X ULN at any time)

in serum transaminase (ALT, AST) or gamma-GT levels have been observed

in some patients administered quetiapine. These elevations were usually

Endocrine disorders