Diphenhydramine is indicated for the treatment of followings:
Seasonal, perennial, vasomotor rhinitis
Urticaria, angioneurotic oedema, anaphylaxis
Pruiritic conditions
Premedication for emesis and motion sickness
Miscellaneous like meniere's disease and parkinsonism
Dosage
Adryl Syrup 10 mg/5 ml dosage
Adult-
Most allergic conditions: 25-50 mg three times a day with a further 50 mg at night.
Children-
1 to 5 years of age: 5 mg i.e., 2.5 ml of elixir 4 times a day
More than 6 years of age: 10 mg i.e. 5 ml of elixir 4 times a day
Side Effects
Side effect includes sedation, dizziness, tinnitus, fatigue, ataxia, blurred vision, diplopia, euphoria, and epigastric discomfort.
Precaution
Caution should be exercised with patients in whom drowsiness is undesirable e.g., drivers, machine operators. Concomitant consumption of alcohol or central nervous system (CNS) depressants will potentiate drowsiness.
Interaction
Diphenhydramine administration significantly reduces the absorption of the antituberculous agent para-aminosalicyclic acid (PAS) from the gastrointestinal tract. CNS depressants may potentiate the sedative action of Diphenhydramine. Anticholinergic drugs may potentiate Diphenhydramine’s anticholinergic side effects.
Pregnancy & Breastfeeding use
Category B: There are no adequate and well controlled studies in pregnant women using diphenhydramine hydrochloride. Therefore, diphenhydramine hydrochloride should be used in pregnancy only if clearly needed. Diphenhydramine hydrochloride has been reported to be excreted in breast milk and thus, use of diphenhydramine hydrochloride in lactating mother is not recommended.
Contraindication
Known hypersensitivity to Adryl Syrup 10 mg/5 ml, Ammonium chloride is contra-indicated in presence of impaired hepatic or renal function.
Acute Overdose
Symptoms: Impaired consciousnessÍž psychosis, seizures, antimuscarinic symptoms (e.g. mydriasis, tachycardia, tachyarrhythmias), resp failure, rhabdomyolysis; acute delirium with visual and auditory hallucination (topical). Management: Supportive and symptomatic treatment. Convulsions and marked CNS stimulation may be treated with IV diazepam.
Storage Condition
Store between 15-30° C. Protect from moisture.
Innovators Monograph
*** Taking medicines without doctor's advice can cause long-term problems.