4-METHYLAMINOREX (U4EUH, ICE, 4-MAR)

4-Methylaminorex (4-MAR, 4-MAX) is a stimulant drug of the 2-amino-5-aryloxazoline class that was first synthesized in 1960 by McNeil Laboratories. It is also known by its street names “U4Euh” (“Euphoria“) and “Ice

Dosage

4-methylaminorex can be smoked, insufflated or taken orally.

As an anorectic, the ED50 is 8.8 mg/kg in rats for the (±)-cis isomers. The (±)-trans isomers are slightly more potent at 7.0 mg/kg. As a recreational drug, the effective dosage ranges from 5 to 25 mg.

In the 1970s McNeil Laboratories, Inc. was trying to bring 4-methylaminorex to drug market as a sympathomimetic (most commonly used as asthma-medicines), research name was McN-822, they mention that human dose would have been 0.25 mg/kg of body weight. They mention also LD50: 17 mg/kg p.o for mice