Amphetamine and methamphetamine are stimulant drugs that change normal function in the brain and body by altering levels of naturally occurring substances called neurotransmitters. The two drugs are so closely related that methamphetamine turns into amphetamine when it starts to break down inside the bloodstream. However, despite their similarities, the two drugs have different levels of potency and work in somewhat different ways inside the body. In addition, while doctors commonly use amphetamine-based prescription medications for the treatment of certain health problems, use of methamphetamine-based prescription medications is much less common.
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