Ephedrine Hydrochloride (Hcl) is a central nervous system stimulant used to treat breathing problems (as a bronchodilator), nasal congestion (as a decongestant), low blood pressure problems (orthostatic hypotension), or myasthenia gravis. Ephedrine is also used to treat narcolepsy, menstrual problems (dysmenorrhea), or urine-control problems. Ephedrine is available in generic form.