#1 Pill for Prescription Weight Loss

phentermine bottle

Phentermine is the most popular weight loss medication in the United States. Its active ingredient, phentermine hydrochloride, is an amphetamine-like substance that suppresses appetite and boosts energy.


  1. Phentermine is the most widely-prescribed weight-loss medication in the United States.
  2. It first received FDA approval in 1959 as an appetite suppressant for the short-term management of obesity.
  3. Phentermine helps patients lose weight by decreasing appetite and boosting energy.
  4. The medication’s active ingredient, Phentermine Hydrochloride (Phentermine HCl), is a sympathomimetic amine anorectic that functions as a central nervous system stimulant.
  5. It is available as a tablet, capsule or orally dissolving tablet (ODT), and sold under the popular brand names: Adipex, Qsymia and Lomaira.
  6. Phentermine HCL is a schedule IV controlled substance. For that reason, it is only available with a doctor’s prescription, and only for 12 weeks at a time.
  7. 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.


Looking to buy phentermine or Adipex online? Learn more about where to buy phentermine.

phen caps bottle

Phen Caps​

Phen Caps are the leading alternative to phentermine weight loss pills. Available online 24/7.

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phentermine bottle

Phentermine 37.5

Phentermine is a prescription appetite suppressant used for the treatment of obesity.

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adipex bottle

Adipex 37.5

Adipex is the most popular brand of phentermine HCL in the United States.

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Essential Phentermine Information

Whether you’re new to phentermine, or looking for more in-depth information after a few months of treatment, these pages are a great place to start!

phentermine prescription

How to Get a Phentermine Prescription

Phentermine is a prescription-only medication. It must be purchased from a pharmacy and cannot be purchased online. Learn more about where to buy phentermine safely and legally.

side effects

Phentermine Side Effects

Phentermine is an effective weight loss medication, but can cause a wide variety of adverse reactions. Learn about phentermine side effects, both common and severe.


Phentermine Dosage

Phentermine is available in dosages ranging from 8mg to 40mg, depending on the region. Read more about these and the other common phentermine dosages here.

fake phentermine

Avoiding Fake Phentermine

What do real phentermine pills look like? How can I avoid purchasing fake medication? If you want answers to these questions, check out the phentermine pill identifier here.

Phentermine 37.5mg capsule (blue/white, KVK Tech)

Phentermine 37.5 mg

37.5 milligrams (mg) is the most popular dose of phentermine weight loss pills and can be achieved by taking 1-2 pills per day. It is also the maximum daily dosage in most countries.


Phentermine Withdrawal

Phentermine is only approved for short-term use, partially due to the active ingredient’s addictive potential. Some users experience withdrawal symptoms at the end of treatment.

Popular Brands of Weight Loss PILLS

adipex brand

Adipex-P is the most popular brand of phentermine diet pills in the US. It is available as either tablets or capsules but, unlike other brands, it only comes in one dose: 37.5 mg. Adipex is typically taken once per day in the morning.

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qsymia brand

Qsymia contains a combination of phentermine HCL and topiramate extended-release. Qsymia, which is available in 4 doses, is an effective weight loss pill. However, it is riskier and more expensive than single-ingredient preparations.

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lomaira brand

Lomaira contains just 8mg of phentermine HCL per tablet. It is the lowest available dose. This pill can be taken up to three times per day, so it may be preferable for patients who struggle with nighttime cravings or bingeing.

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phencaps brand

Phen Caps is a non-prescription weight loss supplement that uses all-natural ingredients to suppress appetite and boost energy. It doesn’t contain any phentermine HCL. Phen Caps is available online and has absolutely no side effects!

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Phentermine Reviews

Looking for reviews to find out how phentermine could help you lose weight? Browse hundreds of people’s opinions brands including Adipex, Qsymia and more!

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

Generic Phentermine

By Ninna On May 2, 2019
Thank you phentermine!


By Luna On Aug 18, 2019
Great Time

Phentermine 37.5 mg

By MichelleG March 28, 2019
I’ve lost 30 pounds total!


By Nick On Apr 10, 2019
80 Pound Weight Loss

Phentermine Results

Get inspired! Browse dozens of jaw-dropping before and after comparisons submitter by real phentermine users.

Lost 50 pounds

“Nine months before my wedding I decided to go to a weight loss clinic to get my life back on track. And it worked!”

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Chrissy before picture Chrissy after picture
Lost 138 pounds

“Nothing else worked like this. I lost over 130lbs and I can’t imagine where my life would be if I hadn’t had found these pills – amazing!”

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Michel before picture Michel after picture

Phentermine Support Groups

Social groups centered around phentermine provide you with much-needed advice, support and encouragement during your weight loss journey! manages the following support groups on Facebook – join now!

Losing Weight With Phentermine

phentermine fb group

Looking for steady support during your weight loss journey? This online community is caring, knowledgeable and active, with more than 10,000 users there to help you reach your goals with phentermine!

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Life After Phentermine

after phentermine fb group

We understand that the weight loss journey doesn’t stop when phentermine treatment ends. This group provides much-needed support for individuals interested in long-term weight maintenance and healthy living.

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Grupo Oficial de Apoyo de la Fentermina

fentermina fb group

¿Prefiere español? This Spanish-speaking community provides support for people at all stages of their weight loss journeys: whether you’re considering a change, already taking phentermine or recently finished treatment.

Únase aquí


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The Keto Diet and Phentermine

The ketogenic diet, more commonly referred to as the “keto diet”, is one of the most popular diets for weight loss right now. This very low carb eating plan promises rapid and dramatic weight loss to its followers. However, medical

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Top 10 Superfoods to Eat with Phentermine

It sometimes seems like a new superfood is discovered every day, promising you healthier skin, lower cholesterol, and cancer-fighting properties all in one little pink berry. It can be difficult to find your way through all of the information and

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Phentermine and Fertility

Many women take phentermine to increase fertility or experience unplanned pregnancies shortly after taking this medication. That combination of circumstances leads a lot of people to wonder: does phentermine increase fertility? The short answer is [often] yes… but not because

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