Diphenhydramine has an atropine-like action and thus it should be used with caution in patients with a history of bronchial asthma, increased intraocular pressure, hyperthyroidism, cardiovascular disease, or hypertension, patients with narrow-angle glaucoma, urinary retention, prostatic hypertrophy and respiratory depression.
This preparation may cause drowsiness. If affected, patient should not drive or operate machinery. Patients should avoid alcoholic beverages. When used for treatment of cough and cold: Not to be used in children less than 2 years of age.
To be used with caution and doctor's/pharmacist's advice in children 2 to 6 years of age.
Effect on ability to drive and use machine: This product may cause drowsiness. If affected, the patient should not drive or operate machinery.