Guaifenesin is an expectorant used to help relieve chest congestion. Chest congestion is a common symptom of many illnesses. Guaifenesin loosens up mucus in the chest and lungs to ease this symptom. This medication will not treat or cure the underlying condition causing chest congestion, but it does help minimize discomfort.
Some strengths of guaifenesin are available over the counter, meaning they can be purchased without a prescription. Other strengths, or certain formulations containing guaifenesin, require a written prescription from a licensed healthcare provider. Guaifenesin is available in generic form as guaifenesin or under various brand names such as Mucinex or Robitussin. It’s important to note that these medicines may contain other drugs. Be sure to read the packaging of your medication so you are aware of its active ingredients.