The molecular formula of Ephedrine Hydrochloride is C10H15NO.HCl. Its molecular weight is 201.7. The CAS registry number of Ephedrine hydrochloride is 50-98-6. Ephedrine belongs to a group of medicines called sympathomimetics. Sympathomimetic drugs affect the part of your nervous system that works automatically. Ephedrine Injection is used to relieve low blood pressure during spinal or epidural anaesthesia. It raises blood pressure by temporarily reducing the blood supply to small blood vessels.