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The "best" cough medicine is ultimately based on the type of cough you have, as well as an evaluation of possible side effects. The three main types of over-the-counter (OTC) medicines adults can use ...

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Guaifenesin is the active ingredient in several common expectorants, including Mucinex and Robitussin. It is a safe and effective drug for relieving a chesty cough and other mucus-related symptoms.