Phentermine: #1 Diet Pill for Weight Loss



Information You Can Trust

Ready to learn more about phentermine and how it helps you lose weight?

We will make your weight loss journey simple and meaningful. All of our reference pages are reviewed by doctors and supported with scientific references. You can trust that the information you read on is accurate and medically-sound.

What is Phentermine?

  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 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. 

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Essential Phentermine Information

Whether you're new to the medication, or looking for more in-depth information, the following resources are a great place to start!

What is Phentermine?

New to phentermine? Want a general overview of the medication, its side effects and potential results? Learn all about it in one extensive guide.

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Phentermine Side Effects

Phentermine is an effective weight loss medication, but it comes with a wide variety of potential side effects. This page discusses possible phentermine side effects, both common and severe.

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Phentermine Dosage

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

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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 in most countries. 

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Phentermine Withdrawal

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

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Phentermine Pill Identifier

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.

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Where to Buy Phentermine

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

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Adipex-P 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. 

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Qsymia contains a combination of phentermine HCL and topiramate extended-release. Qsymia works well for some people, but it also carries more risks and costs more than single-ingredient preparations.

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Lomaira contains just 8mg of phentermine HCL per tablet, making it 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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Phentermine OTC Alternative

Phen Caps is an all-natural weight loss supplement that contains nine powerful ingredients to suppress appetite and boost energy. Since Phen Caps do not contain any phentermine HCL, they are available online & without a prescription. Plus, Phen Caps have 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 opinions on 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 BJ On May 13, 2019
Generic Phentermine - Good luck!
By Zara On May 6, 2019
Generic Phentermine - 💛 Happy Monday everyone!
By Ninna On May 2, 2019
Generic Phentermine - Thank you phentermine!


Phentermine Results

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

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

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

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

¿Prefieres 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 with treatment, this group has something for you!

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Weight Loss Motivation Blog

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 know which foods are good and for what reason, but there are some surprisingly simple […]

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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 the pill has any special powers. In both men and women, carrying extra weight decreases […]

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how to lose weight fast with phentermine

How To Lose Weight Fast With Phentermine

May 22, 2019

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

What to Eat While Taking Phentermine

May 15, 2018

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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