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A member asked:

Does dm in robitussin (guaifenesin) affect your brain?

A doctor has provided 1 answer

Not mine but maybe..: Dextromethorphan, (the dm) is a neurotransmitter receptor blocker, which means it definitely causes alteration of brain signalling. Some people are more susceptible to its effects than others. Also medication interactions can magnify the dm effects.

Answered 10/18/2012

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