There is now ample evidence that dopamine is involved in the rewarding and motivational effects produced by a long list of drugs, including all of the following except alcohol, amphetamines, cocaine

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Librium is a benzodiazepine medication used to treat anxiety and alcohol withdrawal symptoms. It acts on the GABA system in the brain, not the dopamine system, and therefore is not directly involved in the rewarding and motivational effects produced by drugs that act on the dopamine system.

There Is Now Ample Evidence That Dopamine Is Involved in the Rewarding