Subscribe to receive new product updates, special offers, and the latest water methanol injection tuning tips and technical articles. Find patient medical information for Promethazine on WebMD including its uses, side effects and safety, interactions, pictures, warnings, and user ratings Promethean Action is a political movement dedicated to defying oligarchy & unleashing the fire of human creativity! Promethazine is a phenothiazine and antihistamine used to treat allergies, motion sickness, nausea, and as a sedative or sleep aid by altering brain chemicals. Subscribe to receive new product updates, special offers, and the latest water methanol injection tuning tips and technical articles. Promethazine, sold under the brand name Phenergan among others, is a first-generation antihistamine, sedative, and antiemetic used to treat allergies, nausea, and vomiting. It may also help with some symptoms associated with the common cold [8] and may also be used for sedating people who are agitated or anxious, an effect that has led to some recreational use (especially with codeine). [9][10. NHS medicines information on promethazine – what it's used for, side effects, dosage and who can take it. View promethazine hydrochloride information, including dose, uses, side-effects, renal impairment, pregnancy, breast feeding, contra-indications and important safety information. Learn about promethazine DM usage and dosing. Read the latest news and reviews about the drug as well as potential side effects and popular alternatives. Promethazine may also be given to you by a doctor. This can be for use in any of the above situations or for use in the following additional situations: to help you feel more relaxed before an operation as a short-term sedative for both adults and children to calm you down or to induce sleep.