Guaifenesin: what pharmacies actually pay
Prices below are the National Average Drug Acquisition Cost (NADAC) — the federal government's weekly survey of what pharmacies actually pay their wholesalers, as of 07/22/2026. Your pharmacy's cash price includes their markup and dispensing cost, so it will be higher — but if it's many times this number, that's a signal to shop around.
| Form & strength | Pharmacy cost | Unit | Type |
|---|---|---|---|
| GUAIFENESIN 100 MG/5 ML SOLN | $0.01 | per mL | OTC |
| GUAIFENESIN 200 MG TABLET | $0.03 | per tablet/unit | OTC |
| GUAIFENESIN 400 MG TABLET | $0.07 | per tablet/unit | OTC |
| GUAIFENESIN ER 1,200 MG TABLET | $0.44 | per tablet/unit | OTC |
| GUAIFENESIN ER 600 MG TABLET | $0.29 | per tablet/unit | OTC |
Rough math: a typical 30-day supply of one tablet/day equals 30× the per-unit cost.
This is pricing information, not medical advice. Talk to your doctor or pharmacist before changing any medication.
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