Doesn't interfere: Robitussin (guaifenesin) doesn't decrease the effectiveness of oral contraceptives. I am concerned however with why you are drinking Robitussin (guaifenesin) and how much you are drinking. This might be something to look into. Hope this helps.
Answered 5/29/2015
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A doctor has provided 1 answer
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A doctor has provided 1 answer
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