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GuaifenesinOver the counter
Pronounced gwye-FEN-e-sin
Brand names: Mucinex, Robitussin
Type: Expectorant (mucus thinner) · All Lung & Breathing Medicines
What Guaifenesin is used for
- Loosening chest mucus in colds
- Loosening mucus in bronchitis
◆ Kidney note
People with kidney disease should check combination cold products carefully, as many also contain ingredients that strain the kidneys or raise blood pressure.
Common side effects
- Nausea
- Dizziness
- Headache
- Rash
Important cautions
- Drinking adequate fluids helps it work; a cough that lasts, or comes with fever or blood, needs medical review rather than continued self-treatment
How it comes
Tablets, extended-release tablets, liquid, granules. This guide lists forms only — it never lists strengths or doses.
Related medicines — Lung & Breathing Medicines
Please note: This page is a patient-education summary, not medical advice, and it deliberately contains no doses. Medicines affect everyone differently — always follow your own prescription and talk to your doctor or pharmacist before starting, stopping or changing any medicine.