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 (MDA) [meth″il-di-ok″se-am-fet´ah-mēn]
a hallucinogenic compound chemically related to amphetamine and mescaline; it is widely abused and causes dependence.




1 abbreviation for Muscular Dystrophy Association.
2 abbreviation for methylenedioxyamphetamine.


A phenethylamine and amphetamine class of psychoactive agent, used primarily as a recreational drug but also to facilitate transcendence, meditation, psychedelic psychotherap and psychonautics. There are no medical indications for MDA.

Adverse effects
Cardiovascular and CNS stimulation; acute effects include agitation, sweating, hypertension, tachycardia, hyperthermia, convulsions, death.


1. Mento-dextra anterior–obstetrics.
2. Methydopamine.
3. 3,4-Methylenedioxymethamphetamine. See Ecstasy.

Medical Devices Agency

; MDA UK competent authority for manufacture of medical devices (e.g. bespoke orthoses); EEC Directive 93/42 requires that all manufacturers are registered with the MDA, and that all manufactured orthoses carry the CE mark (see Box 1)
Box 1: Registration with the Medical Devices Agency (MDA)

MDA, methylenedioxyamphetamine; a highly addictive hallucinogenic substance.
References in periodicals archive ?
Determination of amphetamine, methamphetamine, 3,4-methylenedioxyamphetamine, 3,4-methylenedioxyethylamphetamine, and 3,4-methylenedioxymethamphetamine in urine by online solid-phase extraction and ion-pairing liquid chromatography with detection by electrospray tandem mass spectrometry.
The aims of this study were as follows: (a) to investigate the presence and the concentration of MDMA and its main metabolites, 3,4-methylenedioxyamphetamine (MDA) and 4-hydroxy-3-methoxymethamphetamine (HMMA), in saliva; (b) to assess the eventual correlation between salivary and plasma MDMA concentrations; and (c) to determine the effect of salivary pH on the MDMA saliva-to-plasma (S/P) ratio.
The designer drugs 3,4-methylenedioxymethamphetamine (MDMA,; [4] ecstasy), 3,4-methylenedioxyethylamphetamine (MDEA; eve), and 3,4-methylenedioxyamphetamine (MDA), the latter being a designer drug but also an important metabolite of both MDMA and MDEA, are all methylenedioxyamphetamine derivatives (Fig.

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