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Amphetamine and Related Drugs

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Disposition in the Body.<br />

It is absorbed into the blood stream after ingestion <strong>and</strong><br />

excreted in urine, the majority of the dose unchanged (65%<br />

within 3 days). Metabolism occurs by a number of routes: N-<br />

demethylation of the parent compound to 3,4– 3,4<br />

methylenedioxyamfetamine (MDA) (7%) with further O-<br />

demethylation to 3,4–dihydroxymethamfetamine 3,4 dihydroxymethamfetamine (HHMA)<br />

<strong>and</strong> 3,4–dihydroxyamfetamine 3,4 dihydroxyamfetamine (HHA). Both HHMA <strong>and</strong><br />

HHA are subsequently O-methylated methylated mainly to 4–hydroxy 4 hydroxy–3–<br />

methoxymetamfetamine (HMMA) <strong>and</strong> 4–hydroxy 4 hydroxy–3–<br />

methoxyamfetamine (HMA). These four metabolites are<br />

excreted in the urine as the conjugated glucuronide or sulfate<br />

metabolites.<br />

4/27/2009 ٣٨

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