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Methamphetamine is a man-made stimulant drug-a more potent form of the drug amphetamine. It was first synthesised from ephedrine in 1918, and was also used during World War II. There are different forms of methamphetamine, generally distinguished by their appearance and perceived purity.The three main forms are:hile there was no significant increase in meth/amphetamine use in 2013, there was a change in the main form of meth/amphetamine used. Use of powder decreased significantly from 51% to 28.5% while the use of ice (or crystal methamphetamine) more than doubled, from 22% in 2010 to 50.4% in 2013.
L-methamphetamine is a fine example of how molecules that vary only in their chirality can have very different biological effects.Chiral molecules have non-superimposable mirror images. L-methamphetamine, at left, below, is found in Vicks Vapor Inhalers.(Notice how they obfuscate the name a little bit by calling it âlevmetamfetamineâ). This is the mirror image of D-methamphetamine â the street drug.hiral molecules have non-superimposable mirror images. L-methamphetamine, at left, below, is found in Vicks Vapor Inhalers. (Notice how they obfuscate the name a little bit by calling it âlevmetamfetamineâ).