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A substance made up of about 60% amphetamine. In contrast to speed, which is made up of about 5% amphetamine. Often methamphetamine is defined as base: "a purer form of speed". Methamphetamine is a completely different chemical, with different effects. Base is the same chemical as speed, just in much higher concentrations. Usually has a different effect to speed, as the higher dosage doesn't just mean fuller effects, but whole new ones as well. NB: both amphetamine and methamphetamine have absolutely NOTHING to do with 2,3 methylenedioxymethamphetamine (ecstasy), despite the uneducated and ill-informed ramblings of the DEA.
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