Last updated: March 2026
How Much Does Guaifenesin Rx (Mucinex) Cost?
Cost Breakdown by Type
| Type / Procedure | Without Insurance | With Insurance |
|---|---|---|
| Guaifenesin 600mg ER Tablet | $4 – $10 | $0 – $5 |
| Guaifenesin 1200mg ER Tablet | $6 – $15 | $0 – $5 |
What Affects the Cost
- Brand-name vs. generic availability
- Insurance formulary tier placement
- Pharmacy choice (retail vs. mail-order vs. Costco)
- Manufacturer savings cards and coupons
- Dosage and quantity prescribed
- Geographic location
Insurance Coverage
Typical coverage: Tier 1 generic — covered on most plans; also widely available OTC
Most insurance plans use a tiered formulary: Tier 1 (generic) $0-$15 copay, Tier 2 (preferred brand) $25-$75, Tier 3 (non-preferred brand) $50-$150, Tier 4 (specialty) $100-$500+. Prior authorization may be required for certain medications. Step therapy may require trying cheaper alternatives first.
How to Save Money
- Always ask for generic when available — saves 50-90%
- Use GoodRx, RxSaver, or similar discount cards
- Costco pharmacy is open to non-members and often has lowest prices
- Mark Cuban's Cost Plus Drugs offers transparent low pricing
- Manufacturer patient assistance programs provide free medication to qualifying patients
- HSA/FSA funds can cover medication costs tax-free
Related Procedures & Costs
Frequently Asked Questions
Prescription guaifenesin costs $4 to $15 for a 30-day supply. OTC Mucinex may cost $10 to $25 depending on the formulation and quantity.
A prescription may be written for insurance coverage, higher doses, or to combine with other medications. Some patients prefer the convenience and cost savings of a prescription.
Guaifenesin is an expectorant that thins and loosens mucus. While evidence for its effectiveness is mixed, many patients find it helpful. Staying well-hydrated enhances its effect.