Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.
Excessive anti-cholinergic effects (described below) can occur when promethazine is used with other antihistamines, for example, diphenhydramine (Benadryl); some phenothiazines, for example, thioridazine (Mellaril); some tricyclic antidepressants, for example, amitriptyline (Elavil); clozapine (Clozaril), cyclobenzaprine (Flexeril), and disopyramide (Norpace).
STORAGE: Tablets, syrup and injection should be stored at room temperature between 15-25 C (68-77 F). Suppositories should be stored at 2-8 C (36-46 F).
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