Phentermine is a prescription weight‑loss medication that comes in both brand‑name (e.g., Adipex‑S, Tenuate, Alli) and generic forms. Because it’s a prescription drug, the out‑of‑pocket cost can vary widely depending on a few key factors:
| Factor | Typical Impact on Cost |
|--------|------------------------|
| Brand vs. Generic | Generic phentermine is usually 70‑90 % cheaper than brand names. |
| Dosage Strength | Higher mg tablets cost more per dose but may cover the same month‑long supply. |
| Insurance Coverage | Many health plans cover generic phentermine (often with a copay of $10–$30) but may not cover brand names. |
| Pharmacy | Prices can differ by 10‑20 % between chain and independent pharmacies. |
| Coupons/Discount Cards | Manufacturer or pharmacy discount programs can bring the price down by $10–$50 per month. |
| Quantity | Buying a 30‑day supply versus a 90‑day refill can change the per‑day cost. |
Rough Price Ranges (U.S. 2026)
| Type | Approx. Monthly Cost (30‑day supply) |
|------|-------------------------------------|
| Generic phentermine (15 mg tablets) | $10–$25 |
| Generic phentermine (30 mg tablets) | $15–$35 |
| Brand‑name (e.g., Adipex‑S) | $80–$200+ |
These are general estimates. Prices can fluctuate based on pharmacy, location, and insurance.
Tips to Lower Your Cost
1. Ask Your Doctor to prescribe the lowest effective generic dose.
2. Compare Pharmacy Prices online or with the “price checker” feature on many pharmacy apps.
3. Use Insurance: Many plans include generic weight‑loss drugs in their formulary; ask your pharmacy for the “fill‑and‑go” option so you get the lowest copay.
4. Discount Cards: Pharmacies often have free discount programs; check the manufacturer’s website for coupons.
5. Ask About Sample Programs: Some prescribers can provide a one‑month supply of a brand‑name medication to “try” before switching to a generic.
Bottom Line
If you’re considering phentermine, the generic version is typically the most budget‑friendly, often costing $10–$30 per month after insurance or with discount programs. Brand‑name versions can exceed $100 per month without insurance. Always check with your pharmacist or insurance provider for the most accurate, personalized pricing.