Propiomazine and its Impurities

Propiomazine is an antihistamine blocking H1 receptors. It is used to treat insomnia, and to produce sleepiness or drowsiness and to relieve anxiety before or during surgery or other procedures and in combination with analgesics also during labor. Reference standards of Propiomazine API, and its pharmacopeial, non pharmacopeial impurities, and stable isotopes are listed below.