Midrid 325mg/65mg Capsules
SUMMARY OF PRODUCT CHARACTERISTICS
1 NAME OF THE MEDICINAL PRODUCT
Midrid 325mg/65mg Capsules
Lloydspharmacy Migraine Relief 325mg/65mg Capsules
2 QUALITATIVE AND QUANTITATIVE COMPOSITION
Paracetamol 325.0mg
Isometheptene mucate 65.0mg
3 PHARMACEUTICAL FORM
Capsules
4 CLINICAL PARTICULARS
4.1 Therapeutic indications
In the treatment of migraine and other vascular headaches.
4.2 Posology and method of administration
For oral administration
Adults: 2 capsules at once, then 1 capsule every hour until relief obtained
up to a maximum of 5 capsules within a 12 hour period.
Children: Not recommended.
4.3 Contraindications
Severe cardiac, hepatic or renal impairment, severe hypertension, glaucoma. Patients on monoamine oxidase inhibitor therapy. Porphyria. Hypersensitivity to paracetamol and/or other constituents.
4.4 Special warnings and precautions for use
Cardiovascular disease, diabetes mellitus, hyperthyroidism. When used in patients with high spinal cord lesions, isometheptene, like other sympathomimetics may cause autonomic dysreflexia.
Women who have recently given birth may be at increased risk of developing cerebral vasospasm following use of vasospastic agents. Women should not take Midrid during the post-partum period as there have been several reports of life-threatening cerebral vasoconstriction or intracranial haemorrhage occurring after ingestion of therapeutic doses of isometheptene during the first few weeks after childbirth.
Care is advised in the administration of this product to patients with renal or hepatic impairment. The hazards of paracetamol overdose are greater in those with non-cirrhotic alcoholic liver disease.
Do not exceed the recommended dose.
If symptoms persist consult your doctor.
Keep out of the sight and reach of children.
Patient information leaflet warning:
Immediate medical advice should be sought in the event of an overdose, even if you feel well, because of the risk of delayed, serious liver damage.
Label warning:
Do not take with any other paracetamol-containing products. Immediate medical advice should be sought in the event of an overdose, even if you feel well.
4.5 Interaction with other medicinal products and other forms of interaction
On theoretical grounds, care should be taken with patients receiving cardiac glycosides, quinidine, anti-hypertensives and tricyclic anti-depressants. Alcohol reduces liver capacity to deal with paracetamol. Colestyramine reduces absorption of paracetamol. Metoclopramide and domperidone accelerate absorption of paracetamol. May interact with chloramphenicol, causing increased plasma levels.
The anticoagulant effect of warfarin and other coumarins may be enhanced by prolonged regular use of paracetamol with increased risk of bleeding; occasional doses have no significant effect.
There is an increased risk of toxicity with bromocriptine & isometheptene.
There is an increased risk of a hypertensive crisis when sympathomimetics are given with MAOIs.
4.6 Fertility, pregnancy and lactation
There is no evidence of the product’s safety in human pregnancy nor is there evidence from animal work that it is free from hazard. Avoid in pregnancy and lactation. Midrid should not be taken during the post-partum period (see section 4.4).
4.7 Effects on ability to drive and use machines
No information
4.8 Undesirable effects
Transient dizziness may appear in hypersensitive patients. This can usually be eliminated by reducing the dose. Circulatory disturbances may occur.
Adverse effects of paracetamol are rare but hypersensitivity reactions including skin rashes may occur. Anaphylaxis, angioedema, urticaria and very rare cases of fixed drug eruption have been reported. There have been reports of blood dyscrasias including thrombocytopenia purpura and agranulocytosis, but these were not necessarily causally related to paracetamol.
Blood disorders have also been reported with isometheptene-containing products. 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 the Yellow Card Scheme at: www.mhra.gov.uk/yellowcard.
4.9 Overdose
Isometheptene
Limited information is available regarding overdose. There have been reports of cerebrovascular vasoconstriction or intracranial haemorrhage following overdose or use of excessive amounts of isometheptene-containing products.
Paracetamol
Liver damage is possible in adults who have taken 10g or more of paracetamol. Ingestion of 5g or more of paracetamol may lead to liver damage if the patient has risk factors (see below).
Risk factors
If the patient
a, Is on long term treatment with carbamazepine, phenobarbitone, phenytoin, primidone, rifampicin, St John’s Wort or other drugs that induce liver enzymes.
or
b, Regularly consumes ethanol in excess of recommended amounts. or
c, Is likely to be glutathione deplete e.g. eating disorders, cystic fibrosis, HIV infection, starvation, cachexia
Symptoms
Symptoms of paracetamol overdosage in the first 24 hours are pallor, nausea, vomiting, anorexia and abdominal pain. Liver damage may become apparent 12 to 48 hours after ingestion. Abnormalities of glucose metabolism and metabolic acidosis may occur. In severe poisoning, hepatic failure may progress to encephalopathy, haemorrhage, hypoglycaemia, cerebral oedema, and death. Acute renal failure with acute tubular necrosis, strongly suggested by loin pain, haematuria and proteinuria, may develop even in the absence of severe liver damage. Cardiac arrhythmias and pancreatitis have been reported.
Management
Immediate treatment is essential in the management of paracetamol overdose. Despite a lack of significant early symptoms, patients should be referred to hospital urgently for immediate medical attention. Symptoms may be limited to nausea or vomiting and may not reflect the severity of overdose or the risk of organ damage. Management should be in accordance with established treatment guidelines, see BNF overdose section.
Treatment with activated charcoal should be considered if the overdose has been taken within 1 hour. Plasma paracetamol concentration should be measured at 4 hours or later after ingestion (earlier concentrations are unreliable). Treatment with N-acetylcysteine may be used up to 24 hours after ingestion of paracetamol, however, the maximum protective effect is obtained up to 8 hours post-ingestion. The effectiveness of the antidote declines sharply after this time. If required the patient should be given intravenous N-acetylcysteine, in line with the established dosage schedule. If vomiting is not a problem, oral methionine may be a suitable alternative for remote areas, outside hospital. Management of patients who present with serious hepatic dysfunction beyond 24h from ingestion should be discussed with the NPIS or a liver unit.
5 PHARMACOLOGICAL PROPERTIES
5.1 Pharmacodynamic properties
Paracetamol is an effective analgesic and antipyretic agent but has only weak anti-inflammatory properties. Its mechanism of action is not fully understood as it is only a weak inhibitor of prostaglandin biosynthesis, but it has been suggested that it is more effective against enzymes in the CNS than those in the periphery. The drug has no effect on the cardiovascular and respiratory systems, and it does not cause gastric irritation or bleeding like salicylates.
Isometheptene mucate is a sympathomimetic agent believed to act in migraine headache by a sympathetic activation to close arteriovenous anastomoses felt to contribute to the pain of migraine.
5.2 Pharmacokinetic properties
Isometheptene mucate is rapidly excreted in man. Excretion peaks at 2-6 hours after dosing.
Paracetamol is readily absorbed from the gastro-intestinal tract with peak plasma concentrations occurring about 30 minutes to 2 hours after ingestion. It is metabolised in the liver and excreted in the urine mainly as the glucuronide and sulphate conjugates. Less than 5% is excreted as unchanged paracetamol. The elimination half-life varies from about 1 to 4 hours. Plasma-protein binding is negligible at usual therapeutic concentrations but increases with increasing concentrations.
A minor hydroxylated metabolite, which is usually produced in very small amounts by mixed-function oxidases in the liver and which is usually detoxified by conjugation with liver glutathione, may accumulate following paracetamol overdosage and cause liver damage.
5.3 Preclinical safety data
There are no other data of relevance to the prescriber which are not included on the SPC.
6 PHARMACEUTICAL PARTICULARS
6.1 List of excipients
Microcrystalline cellulose Talc
Colloidal silicon dioxide Capsule shell:
Gelatin
Water
Titanium dioxide Erythrosine Quinoline yellow Indigotine
Printing ink Opacode black S-1-8100HV
6.2 Incompatibilities
Not applicable
6.3 Shelf life
3 years
6.4 Special precautions for storage
Do not store above 25°C
6.5 Nature and contents of container
Strips of 5 or 15 capsules
Blister packs of 5, 10, 15, 20 and 30 capsules
6.6 Special precautions for disposal
None
7 MARKETING AUTHORISATION HOLDER
DHP Healthcare Ltd 26 Pickering Street Maidstone Kent
ME15 9RS UK
8 MARKETING AUTHORISATION NUMBER(S)
PL 00111/0205
9 DATE OF FIRST AUTHORISATION/RENEWAL OF THE AUTHORISATION
27/01/1983
10 DATE OF REVISION OF THE TEXT
01/07/2015