Phentermine: Our #2 Favorite Diet Pill


Phentermine Review

Phentermine is a prescription obesity drug.  Doctors prescribe this medication to patients who are obese and whose weight threatens their health.  When the patient has been unable to lose weight successfully through diet and exercise alone, doctors may recommend this option.  While it does not cause weight to simply disappear from the body, many patients find it makes dieting easier to stick to while they use it.

This drug is based on the chemical called phentermine hydrochloride (HCl).  That is its generic name, though it is sold under many brand names, as well.  These include Adipex-P, Adipex, and Ionamin, among others.  That said, no matter what name is printed on the label, the medication’s active ingredient remains the same.

Are Adipex Diet Pills the Same?

Adipex diet pills are a brand name version of Phentermine.  As a result, these are also based on the generic medication phentermine hydrochloride (HCl).  This prescription drug must be obtained in the same way and can only be legally prescribed by a licensed doctor.

This medication is meant to be used as a component of a larger overall obesity treatment strategy.  To use Adipex diet pills properly, obesity patients must carefully follow the recommendations prescribed by their doctors – which typically include calorie-controlled dieting and fitness-appropriate exercise.  It’s also extremely important to keep up regular appointments with the prescribing doctor, who needs to monitor your progress and reaction to this medication.

Adipex diet pills can be used only over the short term. Usually, doctors will prescribe them for a handful of weeks at a time.  Breaks are needed between uses in order to avoid addiction and overcome the tolerance the body can build up quite rapidly.  This tolerance will cause the drug to become less effective over time.  Taking more will not make it more effective, but it will increase the risk of addiction and severe side effects. That said, taking these pills over spans of weeks can help to build the long-term habits needed to lose weight and stop it from returning.

Why Use Phentermine?

A doctor will prescribe Phentermine to provide a dieter with obesity with added support in his or her efforts to lose weight.  A prescription for Phentermine will also be accompanied with requirements to make significant lifestyle changes.  These changes include doctor-approved methods of dieting, such as calorie control, as well as fitness-appropriate activity levels. These efforts must be made in order for this drug to be helpful.

A prescription for Phentermine will also be accompanied with requirements to make significant lifestyle changes.

Phentermine’s effects include energy boosting, metabolism enhancing, and appetite suppressing.  In this way, dieters will find it easier to stay driven to do their workouts and prepare their healthy foods, they will be satisfied by smaller amounts of food, and they will burn through more calories while doing their workouts.

Phentermine’s Active Ingredient

Phentermine contains only one active ingredient, which is phentermine HCl.  That substance has undergone substantial research in order to make its way through the formal FDA approval process.  That FDA approval research is quite extensive.


As a prescription obesity treatment, Phentermine is not appropriate for everyone.  This is not safe for individuals who are not obese or who want to achieve cosmetic weight loss.  If you just want to fit into a wedding dress or look better in a bikini, this will not be prescribed to you.

That said, if you suffer from obesity, or if you are overweight and nearly obese and your excess weight is increasing your risk of serious health conditions, a prescription may be made for you.  Among the health conditions that may be affected by being very overweight or obese, include: heart disease, high blood pressure, diabetes, and even some cancers.

For these patients, using Phentermine to help lose weight makes the potential risks worthwhile.  The reason is that by losing the weight, it can lower their risk of disease and increase their longevity.  Though there are potential drawbacks to using this drug, the improvements to long-term health often justify its use.

Among those drawbacks include side effects which can range from being very mild and temporary to quite severe.  This drug can also be habit forming.  This means that your body can become addicted to it and suffer from withdrawal symptoms when the time comes to stop using it. Therefore, many doctors recommend a careful gradual cessation schedule and will prescribe this drug for only a few weeks at a time.

If you feel Phentermine may be appropriate for you, it’s very important to speak with your doctor about both the advantages it can offer, as well as the disadvantages it may present. Your doctor may feel it is an appropriate fit to help you to lose weight or may recommend that you look into non-prescription options instead.

Final Phentermine Ranking Calculations

The following is a breakdown of how we created our rank for Phentermine. To better understand our ranking system, continue reading.

Ingredient Safety

Ingredient Safety: One ingredient in Phentermine has been researched and proven safe: 0.1 point added. One ingredient has been associated with mild to severe side effects, drug interactions and a risk of addiction: 2 points deducted.

  • Phentermine HCl – (+0.1points) – This substance was studied and proven safe to use under a doctor’s supervision, when used by patients with obesity following a doctor-prescribed eating plan and fitness regimen.
  • Phentermine HCl – (2 points deducted) – Research has shown that Phentermine can cause a wide range of side effects from mild to severe and this drug can interact with almost 500 other medications, many of which are very commonly used.

Banned Ingredients(USA): No deductions.

Formula Effectiveness

Ingredients underwent clinical research published in peer-reviewed industry journals: No deductions.

Ingredients proven ineffective in clinical research published in peer-reviewed industry journals: No deductions.

Ingredients shown in reputable studies to be potentially beneficial to weight loss: No additions.

Ingredients clinically proven to provide significant weight management support in clinical research published in peer-reviewed industry journals: 0.3 points added.

  • +0.3 points – Phentermine HCl was thoroughly studied as a part of the formal FDA approval process. It successfully received FDA approval for use as a prescription obesity drug due to its results.

Overall Phentermine User Reviews

Average user rating: 1 point added. Phentermine maintains an average 4+ star average user rating.










  • FDA Approved
  • Prescription Obesity Drug
  • Proven Effective
  • Must be Used Alongside a Healthy Lifestyle


  • Requires Regular Monitoring by a Doctor
  • Associated with Mild to Severe Side Effects
  • May Cause Addiction and Withdrawal Symptoms
  • Can be Used for only a Few Weeks at a Time