Ephedrine is a prescription drug with a maximum dose of 60 mg, but according to the British National Formulary an overdose produces restlessness, muscle spasms, racing heart, dry throat and cold extremities. It is not recommended and should be avoided whenever possible. Note that the recreational dose is several times the prescription dose, and is potentially dangerous for people with weak hearts. Physical effects last 3-4 hours with gentle comedown, but you may feel high for several days. Consists of dexamphetamine sulphate.
Effect is similar to speed and causes high blood pressure.
Should not be used with MAO inhibitors. Legal in Britain, sold in sex shops and some clubs in small bottles. Sniffed or breathed in open mouth. Gives strong rushes of euphoria for a minute or two, especially while on E. Can cause black out, headache, nausea and even heart attacks. Traditionally popular among gay men for sex as it relaxes the anus without loss of erection.