Phentermine: #1 Diet Pill for Weight Loss

What is phentermine?

phentermine bottle

Phentermine is the most widely-prescribed weight-loss medication in the United States.

It is available as a tablet, capsule or orally dissolving tablet (ODT), and sold under the popular brand names: Adipex, Qsymia and Duromine.

This medication first received FDA approval in 1959 as an appetite suppressant for the short-term management of obesity. Phentermine helps patients lose weight by decreasing appetite and boosting energy.

Phentermine hydrochloride, the active ingredient in these weight loss pills, is a controlled substance. For that reason, it is only available with a doctor's prescription, and only for 12 weeks at a time.

When used as prescribed, phentermine is usually safe and well-tolerated. However, like all medications, it carries the risk of side effects and is not safe or appropriate for everyone. Potential reactions to this drug range from mild (e.g. dry mouth and insomnia) to severe reactions (e.g. chest pains or trouble breathing). Contact your doctor if any side effect bothers you or doesn’t go away.

Prescription weight loss drugs are designed as a complement to healthy lifestyle habits. It is critical that patients use their time on this medication to develop healthier eating and exercise habits that will help promote and maintain weight loss.

As many Type 2 diabetics are overweight or obese, phentermine provides an important treatment option to help control diabetes by reducing their weight.

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The #1 diet pill in the USA

Phentermine is the most popular weight loss pill sold in the USA. Watch this video for a quick summary of the medication’s history and to learn how it helps you lose weight!

Make sure to visit our Phentermine Ultimate Guide 2018!

This comprehensive page discusses what phentermine is, how it works, possible side effects, common dosages, popular brands, where to buy, and more. Whether you're new to the medication, or looking for more in-depth information, this is a great place to start!

Read the Phentermine Ultimate Guide.

Why is phentermine 37.5 mg so popular?

The strength of phentermine capsules and tablets is shown by how many milligrams (mg) of phentermine HCL they contain. Phentermine 37.5 mg is the maximum daily dosage of phentermine, and by far the most commonly prescribed. But why?

  • 37.5 mg is the highest dosage - since phentermine can only be taken for a limited time, this means that patients get the maximum benefits in the minimum time.
  • Phentermine tablets are only available in 37.5 mg, and more patients are prescribed tablets than capsules.
  • The popular brand Adipex is only available in 37.5 mg, in both tablet and capsule form.

Learn more about phentermine 37.5 mg

Popular Phentermine Brands


Adipex-P, manufactured by Teva Pharmaceuticals USA, is the most popular brand of phentermine diet pills in the US. It is available in tablet or capsule form and comes in a 37.5 mg dosage. Adipex is not the cheapest option, but it is generally considered high-quality.

 Learn more about Adipex


Phentermine 37.5 mg

37.5 milligrams (mg) is the most popular dose of phentermine weight loss pills. It is also the maximum daily dosage. Phentermine 37.5 mg tablets and capsules are sold under both brand name and generic labels.

 Learn more about Phentermine 37.5 mg



Qsymia (previously known as Qnexa) is a combined diet pill that contains a blend of phentermine HCL and topiramate extended-release. It was approved by the FDA in 2012. While the phentermine works to suppress appetite and boost energy, the topiramate makes food seem less appealing. Qsymia is a highly-effective weight loss medication, but it is not right for everyone and costs more than single ingredient pills.

 Learn more about Qsymia



Lomaira, manufactured by KVK Tech, is the lowest dose tablet with just 8mg of phentermine HCL per tablet. Due to its low dose, Lomaira can be taken up to three times per day, which makes it ideal for patients who struggle with nighttime cravings or bingeing.

 Learn more about Lomaira

Phentermine Alternative Brands

Phen Caps: a powerful OTC alternative

Phen Caps contain nine all-natural ingredients to suppress appetite and boost energy. Since Phen Caps do not contain any phentermine HCL, they are available online & without a prescription. The best part? Phen Caps have absolutely NO side effects! 

 Learn more about Phen Caps

Phentermine Side Effects

Phentermine is one of the safest, most effective weight loss drugs available on the market today. However, like all medications, users experience side effects. These reactions range from the most common and mild (e.g. dry mouth, insomnia and constipation) to more severe (e.g. chest pain or trouble breathing).

  1. Dry mouth (xerostomia)
  2. Trouble sleeping (Insomnia)
  3. Constipation
  4. Headache
  5. Dizziness
  6. Rapid Heartbeat
  7. "Phen Rage" (Dysphoria)
  8. Change in sex drive
  9. Red Hash (Urticaria)
  10. Psychosis

See all Side Effects

Real User Reviews

Looking for real phentermine reviews to find out more about how it could help you lose weight? Then check out these reviews of all the leading brands including Adipex, Qsymia and more!

If you would like to share your own experience, please write a review!

Latest Reviews

By D Man On Dec. 12, 2018
By Deb On Dec. 10, 2018
By Natashia On Dec. 3, 2018
Adipex-P - week one

See All Reviews

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How To Lose Weight Fast With Phentermine

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As the leading prescription diet pill in the US, phentermine is the key to rapid weight loss. But, in order to get the most out of your prescription, it’s crucial to know what you need to do to lose weight fast with phentermine. Here we have a four point guide for you to help you achieve the weight loss results you really want with phentermine.

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What to Eat While Taking Phentermine

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At the start of your weight loss journey it can be difficult to know exactly what to eat while taking phentermine. There are so many diets and eating plans to choose from and it’s no different when you’re taking phentermine. Although you will experience a suppressed appetite, it is still very important that you eat well and make the right food choices.

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