Phentermine is a generic prescription medication. The Food and Drug Administration (FDA) has approved it as a short-term treatment to help certain adults with obesity lose weight. Phentermine is meant to be used for only a few weeks. The drug is not for use in people who want to lose a few pounds or are otherwise healthy.

To be specific, phentermine is for use in people with a body mass index (BMI) of 30 or higher. The drug is also for use in people with a BMI of 27 or higher who have a health condition that’s related to weight. These health conditions can include high cholesterol, diabetes, and high blood pressure.

Drug details

Here are some details on phentermine:

  • Drug class: anorectic
  • Drug forms: oral tablet, oral capsule, oral disintegrating tablet
  • Brand-name versions: Adipex-P (oral tablet and oral capsule) and Lomaira (oral tablet)

Read on to learn about phentermine and cost, and how to save money on prescriptions.

As with all medications, the cost of phentermine can vary. Factors that may affect the price you’ll pay include your treatment plan, your insurance coverage, and the pharmacy you use.

To find out what the cost of phentermine will be for you, talk with your doctor, pharmacist, or insurance provider.

Here are answers to some frequently asked questions about drug cost and phentermine.

How much is phentermine without insurance?

The cost of phentermine without insurance can vary. But it’s likely that without insurance, the drug will cost more than if you do have insurance.

If you have questions about the cost of phentermine without insurance, talk with your doctor or pharmacist. Your pharmacist may be able to help determine how much you’ll pay for phentermine without insurance, including the price per pill.

Do the different strengths of phentermine cost the same?

Phentermine is available in different forms and strengths. Your costs may vary depending on the form and strength of phentermine your doctor prescribes.

Phentermine is available in the following forms and strengths. The strengths are listed in milligrams (mg).

Phentermine tabletsPhentermine capsulesPhentermine disintegrating tablets
8 mg15 mg15 mg
37.5 mg30 mg30 mg
37.5 mg37.5 mg

If you have questions about the different forms and strengths of phentermine, and what’s right for you, talk with your doctor.

Phentermine is a generic drug. A generic drug is an exact copy of the active drug in a brand-name medication. The generic is considered to be as safe and effective as the original drug. And generics tend to cost less than brand-name drugs.

Phentermine is available in two brand-name forms: Adipex-P and Lomaira.

Both Adipex-P and Lomaira contain phentermine as the active drug. But they contain phentermine in different strengths:

  • Adipex-P comes as a tablet or capsule in one strength: 37.5 milligrams (mg).
  • Lomaira comes as a tablet in one strength: 8 mg.

This means the 15-mg and 30-mg strengths of phentermine are available only as the generic drug.

In addition, the oral disintegrating tablet form of phentermine is available only as a generic. There’s no brand-name product that comes as an oral disintegrating tablet.

To find out how the cost of Adipex-P or Lomaira compares with the cost of phentermine, talk with your doctor, pharmacist, or insurance provider.

If your doctor has prescribed phentermine and you’re interested in using Adipex-P or Lomaira instead, talk with your doctor. They may have a preference for one version or the other. You’ll also need to check with your insurance provider, as it may cover only one or the other.

Phentermine is not approved to be used for longer than a few weeks. However, the drug may be prescribed off-label for longer treatment of obesity. Off-label drug use means using a drug for a purpose other than what it’s been approved for by the Food and Drug Administration (FDA).

You should not take more phentermine than the dose your doctor prescribes for you. And it’s important that you do not use phentermine for longer than your doctor advises. You and your doctor can discuss the risks and benefits of using phentermine.

Getting a 3-month supply

You may be able to get a 90-day supply of phentermine. If approved by your insurance company, getting a 90-day supply of the drug could reduce your number of trips to the pharmacy and help lower the cost. If you’re interested in this option, check with your doctor or insurance provider.

Using a mail-order pharmacy

Phentermine may be available through a mail-order pharmacy. Using this type of service may help lower the drug’s cost and allow you to receive your medication without leaving home. Some Medicare plans may help cover the cost of mail-order medications. You may also be able to get a 90-day supply of the drug via mail order.

If you don’t have health insurance, talk with your doctor or pharmacist. They may be able to suggest online pharmacy options that could work for you.

If you need financial support to pay for phentermine, consider looking into websites that offer cost resources and information. Two such organizations are:

These sites can provide details on drug assistance programs, ways to make the most of your insurance coverage, and links to savings cards and other services.

Now that you’ve learned about cost and phentermine, you may still have some questions. Talk with your doctor or pharmacist, who can provide personalized guidance on cost issues related to you and phentermine. But if you have health insurance, you’ll need to talk with your insurance provider to learn the actual cost you would pay for phentermine.

Here are some other resources references you may find helpful:

Disclaimer: Medical News Today has made every effort to make certain that all information is factually correct, comprehensive, and up to date. However, this article should not be used as a substitute for the knowledge and expertise of a licensed healthcare professional. You should always consult your doctor or other healthcare professional before taking any medication. The drug information contained herein is subject to change and is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. The absence of warnings or other information for a given drug does not indicate that the drug or drug combination is safe, effective, or appropriate for all patients or all specific uses.