Guaifenesin (Mucinex) is classified as which type of medication?

• A. Mucolytic
• B. Expectorant
• C. Antitussive
• D. Bronchodilator

Answer: (B)

Guaifenesin is an expectorant. Expectorants help clear the airways by thinning and loosening mucus, which makes it easier to cough up secretions. Guaifenesin works by increasing the hydration of the mucus, reducing its viscosity so a productive cough can more effectively remove mucus from the lungs and airways. It does not chemically break down mucus (that would be a mucolytic), it does not suppress coughing (that would be an antitussive), and it does not widen the airways (that would be a bronchodilator). This is why it’s used for a productive, or wet, cough—to facilitate mucus clearance with coughing. Use with plenty of fluids to enhance the effect, and monitor for mild GI upset as a common side effect.