Phentermine costs $8 to $51 a month without insurance in 2026
Phentermine costs $8 to $51 a month without insurance in 2026. The price depends on the pharmacy, the form, and whether you use a coupon. GoodRx lists an average retail price of $40.18, with coupon prices near $17. SingleCare says the average retail cost is about $51 for 30 days. Drugs.com shows 30 tablets of 37.5 mg for $8.66 to $10.58. Brand Lomaira costs more, at about $41 for 30 tablets of 8 mg.
What price guides say
We checked 3 price guides and read every number on their pages on October 7, 2026. They do not all measure the same thing, so read each line for what it counts.
| Source | What it found |
|---|---|
| GoodRx | GoodRx lists 30 day capsule prices of $16.98 to $17.51 with its coupon, against retail prices of $37.17 to $40.78, and an average retail price of $40.18. |
| Drugs.com | Drugs.com lists 30 tablets of 37.5 mg at $8.66 to $10.58 and 30 capsules of 15 mg at $8.43 for cash buyers. |
| SingleCare | SingleCare says the average retail cost is about $51 for 30 days, with a $10 coupon price at Kroger and Lomaira 8 mg at $41 cash. |
Phentermine price by way to pay
| Way to pay | Price | Source |
|---|---|---|
| Average retail, 30 days | $40.18 | GoodRx |
| GoodRx coupon, 37.5 mg capsules | $16.98 | GoodRx |
| Lowest advertised price | $10.70 | GoodRx |
| Cash, 30 tablets of 37.5 mg | $8.66 to $10.58 | Drugs.com |
| Coupon, 30 tablets of 37.5 mg at Kroger | $10 | SingleCare |
| Average retail, 30 days | $51 | SingleCare |
| Brand Lomaira 8 mg, 30 tablets, cash | $41 | SingleCare |
Every number in this table was read on one of the source pages listed at the bottom of this page.
What pushes the price up
| What | Why it matters |
|---|---|
| Form and strength | Capsules and tablets of 15 mg, 30 mg and 37.5 mg are cheap. The 8 mg tablet is sold as Lomaira and costs much more. |
| Pharmacy | Prices for the same pills differ a lot between stores. Costco, Sam's Club and Kroger often have the lowest cash prices. |
| Coupons | A free discount card from GoodRx or SingleCare can cut the retail price of about $40 to about $17 or less. |
| Quantity | Larger fills cost less per pill. A 30 tablet fill is $8.66 to $10.58 while 90 tablets is $16.14 on Drugs.com. |
| Brand or generic | Generic phentermine is the low cost choice. Brand Lomaira was listed at $41 for 30 tablets, and Adipex-P is no longer sold, per SingleCare. |
What the price includes
The price covers the pills only. It does not cover the doctor visit needed for a prescription, lab work, or any weight loss program. Phentermine is a controlled drug, so you need a new prescription from a licensed provider. Some telehealth plans bundle the visit with the pills, which raises the monthly total. It does not include tax or extras the provider adds on the day.
Does insurance cover it
Many plans do not cover weight loss drugs, and phentermine is often left out. Some plans cover it with a prior approval, and the copay is then set by your plan. Because generic phentermine is so cheap, the cash price with a coupon can be lower than a copay. Ask your plan, then compare it with a coupon price of about $17 from GoodRx. Paying cash may not count toward your deductible, so ask about that too. Ask your plan if it has a weight loss rider.
When a doctor orders it
A doctor may suggest phentermine when diet and exercise have not worked and your weight puts your health at risk. It is usually for adults with a high body mass index, or a lower one with a weight related health problem. It is a short term drug and is not safe for everyone. Your doctor will check your heart, blood pressure and other medicines before writing the prescription.
How to judge your quote
- Ask for the price of generic 37.5 mg before you agree to brand Lomaira.
- Compare at least three pharmacies and one discount card.
- Ask what the visit costs, not only the pills.
- Check the price for 30 days and for 90 days.
- Compare the total with the range above: $8 to $51 per month for most people in 2026.
Ways to pay less
- Compare prices at three or four pharmacies before you fill. The same 30 day supply can differ by more than $20.
- Use a free discount card such as GoodRx or SingleCare instead of paying the retail price at the counter.
- Ask for generic phentermine 37.5 mg tablets or capsules. They cost far less than brand Lomaira.
- Check warehouse club pharmacies. GoodRx lists Sam's Club at $11.59 and Costco at $18.99 for a 30 day supply.
- Ask your doctor about a larger fill if it is safe. Drugs.com shows 90 tablets costs less per pill than 30.
How we got these numbers
The range on this page comes from GoodRx, Drugs.com and SingleCare. We opened each source page and read every number on it on October 7, 2026. Where the sources disagree, the table above shows each one so you can see the spread. These are planning ranges, not quotes. The written price you are given is the real price.
Common questions
How much is phentermine without insurance?
Most people pay $8 to $51 for 30 days. GoodRx lists an average retail price of $40.18, and coupon prices are near $17.
What is the cheapest way to buy phentermine?
Use a discount card and shop around. GoodRx lists a low price of $10.70, and SingleCare lists $10 at Kroger for 30 tablets of 37.5 mg.
Why does Lomaira cost more than phentermine?
Lomaira is a brand name for an 8 mg tablet. SingleCare lists it at $41 for 30 tablets, and Drugs.com lists 90 generic 8 mg tablets at $537.
Is phentermine cheaper in larger amounts?
Yes. On Drugs.com, 30 tablets of 37.5 mg cost $8.66 to $10.58, and 90 tablets cost $16.14. You still need a valid prescription.
Do I need a visit to get phentermine?
Yes. It is a controlled drug, so a licensed provider must write the prescription. The visit is a separate cost from the pills.