Especially in infants and small children, antihistamines in over dosage may cause hallucinations, convulsions and death. Antihistamines may diminish mental alertness. In young children, they may produce excitation.
Because of its antihistamine component, this product should be used with caution in patients with a history of bronchial asthma, narrow-angle glaucoma, gastrointestinal obstruction, or urinary bladder neck obstruction. Because of its sympathomimetic component, this product should be used with caution in patients with diabetes, hypertension, heart disease, or thyroid disease.