Many kinds: Stimulants are drugs that activate physiological processes by acting on neurotransmitters. Caffeine based products liked Vivarin (caffeine) are an example. Decongestants containing pseudoephedrine & phenylephrine also have stimulant effects. All stimulants are dangerous when taken to excess & should only be used as directed. Consult your primary care doctor if you feel you feel chronically tired or drowsy.
Answered 5/16/2015
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A doctor has provided 1 answer
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