Overview
- The independent tester evaluated study data for 27 over-the-counter products in its November 2025 issue.
- All cough suppressants, herbal and synthetic, failed due to insufficient proof of efficacy.
- Most expectorants were judged suitable only with limitations, with effects described as modest.
- Some ingredients carry risks, including rare dependence and hallucinations reported with dextromethorphan.
- Non-drug measures such as honey, warm drinks, lozenges and inhalation were recommended, and doctors note post-cold coughs often last three to four weeks.