Updated December 29, 2014.

Mucinex (Humibid, Robitussin) guaifenesin drug information, dosage, side effects, drug interactions, and warnings. Guaifenesin is an expectorant and mucus thinner used to help the symptoms of cough. Guaifenesin is the active ingredient found in many cough medicines including Humibid, Mucinex, Robitussin, and many others. According to Gold Standard, generic guaifenesin is available as prescription or non-prescription capsules, extended-release capsules, tablets, extended-release tablets, and oral liquids.

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