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Medical Definition of Speed

Speed: Common street name for a stimulant drug, especially for an amphetamine.

Amphetamines have been used to treat hyperactivity in children, the symptoms of narcolepsy, and as an appetite suppressant and they are also frequently abused as a stimulant of the central nervous system.

Source: MedTerms™ Medical Dictionary
https://www.medicinenet.com/script/main/art.asp?articlekey=13198
Last Editorial Review: 6/9/2016

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