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meth- is a prefix used in chemistry. It indicates that a chemical compound has been derived from methane or contains "methyl" groups.

It serves as the number 1 when counting axial atoms in forming names of organic compounds.

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derivatives of meth are commonly used to treat Attention Deficit Hyperactivity Disorder and Attention Deficit Disorder. Common derivatives include Riddlin, Concerta, and Aderall. While methlyphenidate is normally considered highly dangerous when taken in large or short-acting doses, it may actually decrease the likelihood that someone with ADD will get in an accident when taken correctly. This increased safety occurs because medical treatment for ADD increases the affected person's ability to concentrate.

Contributed by Laura Daggett

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