Ephedrine is a medication and stimulant.^[1] It is often used to prevent low blood pressure during spinal anesthesia.^[1] It has also been used for asthma, narcolepsy, and obesity but is not the preferred treatment.^[1] It is of unclear benefit in nasal congestion.^[1] It can be taken by mouth or by injection into a muscle, vein, or just under the skin.^[1] Onset with intravenous use is fast, while injection into a muscle can take 20 minutes, and by mouth can take an hour for effect.^[1] When given by injection it lasts about an hour and when taken by mouth it can last up to four hours.

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