Promethazine hydrochloride is the hydrochloride salt of promethazine. Promethazine is a first-generation antihistamine and antiemetic used to treat allergies, insomnia, and nausea. Promethazine is available by mouth in syrup or tablet dosage forms, as a rectal suppository, or by injection into a muscle.
Promethazine side effects
- fast or slow heartbeats,
- uncontrolled muscle movements in your face (chewing, lip smacking, frowning, tongue movement, blinking or eye movement);
- easy bruising or bleeding (nosebleeds, bleeding gums);