Benadryl Allergy Relief

Document: spc-doc_PL 15513-0017 change



Benadryl Allergy Relief Plus Decongestant Capsules


This product contains 8 mg acrivastine and 60 mg pseudoephedrine hydrochloride.




4.1    Therapeutic indications

This product is indicated for the symptomatic relief of allergic rhinitis.

4.2    Posology and method of administration

Adults and children 12 years and over:

Oral. One capsule as necessary, up to three times a day.

Children under 12 years:

This product is not currently recommended for use in children under 12 years of age. The Elderly:

This product is not currently recommended for use in the elderly.

4.3    Contraindications

This product is contra-indicated in individuals with known hypersensitivity to the product, any of its components or triprolidine.

This product is contra-indicated in individuals with known intolerance to the product, any of its components or triprolidine.

This product is contra-indicated in patients with severe hypertension or severe coronary artery disease.

The concomitant use of a pseudoephedrine-containing product and monoamine oxidase inhibitors can occasionally cause a rise in blood pressure. This product is therefore contra-indicated in patients who are taking, or have taken, monoamine oxidase within the preceding two weeks.

The antibacterial agent furazolidone is known to cause a dose-related inhibition of monoamine oxidase. Although there are no reports of hypertensive crises having occurred, it should not be administered concurrently with this product.

Renal excretion is the principal route of elimination of acrivastine. Until specific studies have been carried out, this product should not be given to patients with significant renal impairment.

4.4 Special warnings and precautions for use

It is usual to advise patients not to undertake tasks requiring mental alertness whilst under the influence of alcohol or other CNS depressants. Concomitant administration of this product may, in some individuals, produce additional impairment.

Although pseudoephedrine has virtually no pressor effects in patients with normal blood pressure, this product should be used with caution in patients taking antihypertensive agents, tricyclic antidepressants or other sympathomimetic agents such as decongestants, appetite suppressants and amfetamine-like psychostimulants. The effects of a single dose on the blood pressure of these patients should be observed before recommending repeated or unsupervised treatment.

As with other sympathomimetic agents, this product should be used with caution in patients with hypertension, heart disease, diabetes, hyperthyroidism, elevated intraocular pressure or prostatic enlargement.

4.5 Interaction with other medicinal products and other forms of interaction

Concomitant use of pseudoephedrine with tricyclic antidepressants, other sympathomimetic agents (such as decongestants, appetite suppressants and amfetamine-like psychostimulants) or with monoamine oxidase inhibitors (including furazolidone), which interfere with the catabolism of sympathomimetic amines, may occasionally cause a rise in blood pressure (see Contraindications).

The effect of antihypertensive agents, which interfere with sympathetic activity, may be partially reversed by this product, e.g. bretylium, betanidine, guanethidine, debrisoquine, methyldopa, alpha- and beta-adrenergic blocking agents.

4.6 Pregnancy and lactation

No information is available on the effects of administration of this product during human pregnancy. This product, like most medicines, should not be used during pregnancy unless the potential benefit of treatment to the mother outweighs any possible risk to the developing foetus.

No information is available on levels of acrivastine which may appear in human breast milk following administration of this product.

It has been estimated that approximately 0.5 to 0.7% of a single 60 mg dose of pseudoephedrine ingested by a nursing mother will be excreted in the breast milk over 24 hours, but the effect of this on breast-fed infants is not known.

4.7 Effects on ability to drive and use machines

Most patients do not experience drowsiness with this product. Nevertheless as there is individual variation in response to all medication, it is recommended that patients are advised not to engage in activities requiring mental alertness, such as driving a car or operating machinery, until they have established their own response to the drug (see Special warnings and precautions for use).

It is recommended that patients are advised not to undertake tasks requiring mental alertness whilst under the influence of alcohol or other C.N.S. depressants. Concomitant administration of this product may, in some patients, produce additional impairment.

4.8 Undesirable effects

In clinical trials with this product, the incidence of somnolence and dizziness was no greater than that from placebo. Reports of drowsiness directly attributable to this product are extremely rare. For the great majority of patients, treatment with this product is not associated with clinically significant anticholinergic or sedative side effects.

Serious adverse effects associated with the use of pseudoephedrine are extremely rare. Symptoms of central nervous system excitation may occur including sleep disturbance, and, rarely, hallucinations.

Skin rashes, with or without irritation, have occasionally been reported with pseudoephedrine. Urinary retention has been reported occasionally in men receiving pseudoephedrine; prostatic enlargement could have been an important predisposing factor.

4.9 Overdose

There have been no reported cases of acute overdosage with this product. It may be expected that as with other sympathomimetic drugs, the symptoms and signs of overdosage may include irritability, restlessness, tremor, convulsions, palpitations, hypertension and difficulty with micturition.

Patients should receive necessary supportive treatment in the event of overdosage. Gastric lavage should be performed if indicated. If desired, the elimination of pseudoephedrine can be accelerated by acid diuresis or by dialysis.

5.1    Pharmacodynamic properties

Acrivastine is a potent, competitive H1-receptor antagonist that lacks significant anticholinergic effects and has a low potential to penetrate the central nervous system. Acrivastine provides symptomatic relief in conditions believed to depend wholly, or partly, upon the triggered release of histamine.

Pseudoephedrine has direct and indirect sympathomimetic activity and is an effective upper respiratory decongestant. Pseudoephedrine is less potent than ephedrine in producing both tachycardia and elevation of systolic blood pressure and is less potent in causing stimulation of the central nervous system. Pseudoephedrine produces its decongestant effect within 30 minutes, persisting for at least 4 hours.

After oral administration of a single dose of 8 mg acrivastine to adult volunteers, the onset of action, as determined by the ability to antagonise histamine induced wheals and flares in the skin, is 15 minutes. Peak effects occur at 2 hours, and although activity declines slowly thereafter, significant inhibition of histamine induced wheals and flares still occur 8 hours after dose.

Relief from the histamine-mediated symptoms of allergic rhinitis is apparent within 1 hour of systemic administration of the drug and lasts for up to 8 hours

5.2    Pharmacokinetic properties

After the administration of one this product to healthy adult volunteers, the peak plasma concentration (Cmax) for acrivastine is approximately 140 ng/ml, occurring at about 1.3 hours (Tmax) after drug administration. The plasma half-life is approximately 1.6 hours. The peak plasma concentration for pseudoephedrine is approximately 210 ng/ml, with Tmax approximately 2 hours after drug administration. The plasma half-life is approximately 5.5 hours (urine pH maintained between 5.0 -7.0). The plasma half-life of pseudoephedrine is markedly decreased by acidification of urine and increased by alkalination. Renal excretion is the principal route of elimination of both acrivastine and pseudoephedrine.

5.3    Preclinical safety data

Pre-clinical safety data do not add anything of further significance to the prescriber.


6.1    List of excipients


Sodium starch glycollate Magnesium stearate Gelatin

Titanium dioxide (E171) Patent Blue V (E131)

6.2    Incompatibilities

None known

6.3    Shelf life

36 months

6.4    Special precautions for storage

Do not store above 25 °C.

Store in the original package to protect from moisture.

6.5    Nature and contents of container

6 or 12 capsules in PVC/PVDC Aluminium foil blister packs.

6 capsules in polypropylene containers with polyethylene snap-fitting lids.

6.6    Special precautions for disposal

None known


McNeil Products Limited Foundation Park Roxborough Way Maidenhead Berkshire SL6 3UG United Kingdom


PL 15513 / 0017


12/02/1997 /    13/12/2004