Guaifenesin 600 mg / Dextromethorphan HBr 30 mg Extended-Release (DM)
Mucinex and its twins. Cough suppressant / expectorant. Active ingredients: Dextromethorphan HBr 30 mg + Guaifenesin 600 mg.
17 options at Walmart, Amazon, Kroger, Target, CVS, Walgreens. Cheapest: 29¢ per pill; typical Mucinex: 71¢ per pill. Prices are estimates from Oct 2026.
Cheapest options
- Equate Mucus Relief DM ER Tablets — Walmart, 40 tablets, $11.47 (29¢ per pill)
- Amazon Basic Care Mucus DM ER Tablets — Amazon, 40 tablets, $11.99 (30¢ per pill)
- Kroger Mucus Relief DM ER Tablets — Kroger, 40 tablets, $12.99 (32¢ per pill)
- up&up Mucus Relief DM ER Tablets — Target, 40 tablets, $13.49 (34¢ per pill)
- CVS Health Mucus DM ER Tablets — CVS, 40 tablets, $19.99 (50¢ per pill)
- Walgreens Mucus Relief DM ER Tablets — Walgreens, 40 tablets, $19.99 (50¢ per pill)
- Mucinex DM 12 Hour Expectorant & Cough Suppressant — Walmart, 40 tablets, $22.47 (56¢ per pill)
- Mucinex DM 12 Hour Expectorant & Cough Suppressant — Amazon, 40 tablets, $23.49 (59¢ per pill)
Where to find it
Look for the “Cough, Cold & Flu” aisle sign.
Good to know
- Mucinex DM is plain Mucinex (guaifenesin 600 mg) plus dextromethorphan HBr 30 mg, a cough suppressant.
- Mucinex DM Maximum Strength and Kirkland Signature Mucus DM (Costco) contain 1,200 mg guaifenesin and 60 mg dextromethorphan per tablet, so they belong to a different group.
- Dextromethorphan — the "DM" — is also an active ingredient in Delsym, NyQuil and DayQuil.