Each tablet, for oral administration, contains prescription mg open this link 50 mg Histaloc promethazine hydrochloride. Your pharmacist can provide more information about promethazine. Promethazine lacks antipsychotic effects, but has strong anticholinergic, antiemetic, and antihistaminic effects.
Possible side effects of Histaloc include:
Histaloc is used to treat diseases such as: Allergic Reactions, Allergic Rhinitis, Anaphylaxis, Light Sedation, Motion Sickness, Nausea/Vomiting, Opiate Adjunct, Sedation, Urticaria, Vertigo.
The maximum daily dose administered in clinical trials is 320 mg in divided doses. If you stop taking this medication for several days, you may need to increase your dose slowly back to your previous dosage.