what is promethazine hydrochloride oral solution usp

What is promethazine hydrochloride oral solution？ Promethazine hydrochloride oral solution is a liquid medication that contains promethazine hydrochloride, an antihistamine used to treat several conditions such as allergies, nausea and vomiting, motion sickness, and sometimes sleep problems. It works by blocking histamine receptors (H1) in the body, which helps reduce allergic reactions, prevent vomiting, and induce sedation. The oral solution form allows for easy dosing, especially for children or people who have difficulty swallowing pills. It is usually measured in milliliters (mL) according to the prescribed dose.