Phentermine: #2 Best Diet Pill of 2018










  • Prescription strength
  • FDA Approved
  • Proven Effects
  • Used along with a healthier lifestyle


  • Associated with side effects (including some severe)
  • Habit forming, withdrawal symptoms are possible
  • Requires regular doctor’s appointments
  • Can be used for only a few weeks at a time (breaks required)


Phentermine bottles

Phentermine is a prescription medication prescribed to help patients with obesity and certain other excess weight struggles to overcome their challenges to lose unwanted body fat. It can be obtained only through a doctor’s prescription. It is made of the chemical phentermine hydrochloride (HCl).

It is sold under several different brands, including Adipex, Adipex-P, Ionamin, Pro-Fast and others. Regardless of its name, it remains the same as the generic drug Phentermine when it comes down to its active ingredient.

While this is an obesity medication, it is not meant to be a solution to losing weight.

Why Use Phentermine?

Phentermine is prescribed to help support the natural weight loss that is the only way to actually take the pounds off the body. When a doctor prescribes this drug, it comes with a requirement to follow certain important lifestyle changes. These include a doctor-approved behavior changes, a fitness appropriate exercise regimen and a calorie reduced eating strategy.

The reason is that Phentermine doesn’t melt fat off the body. It provides potential benefits such as increased energy, reduced appetite and increased metabolic rate. In this way, it means a dieter will not find the struggle as great when cutting back on calories, keeping up with lifestyle changes and boosting physical activity level.

Phentermine’s Active Ingredient

The active ingredient in Phentermine is phentermine hydrochloride. This substance has been studied both on its own and in combination with certain other medications. Its research is adequately extensive to gain it FDA approval ( as a prescription obesity medication. The research determined that it is a powerful stimulant with effects somewhat comparable to amphetamine.


Phentermine is not prescribed to people who are seeking weight loss for cosmetic purposes. If you are trying to drop a few pounds to look better in a bathing suit, this won’t be the pill for you.

However, if you have obesity or if you are overweight and those extra pounds are placing you at a greater risk of serious conditions such as diabetes, high blood pressure, heart disease and certain cancers, then this drug can be beneficial.

Still, while this medication can be worthwhile in improving your longevity because it has reduced your risk of life threatening illnesses, it does come with its own drawbacks. There is a long list of potential side effects associated with using Phentermine. They range from very mild and temporary to quite severe and potentially dangerous. The severe side effects are among the most rare.

The use of this prescription obesity drug is also linked with addiction. As it is habit forming, it can cause withdrawal symptoms if you try to cease its use without following a careful schedule provided by the prescribing doctor.

If you think Phentermine might be right for you, it’s important to speak with your doctor about both the advantages and drawbacks. Many people also choose to try non-prescription alternatives to see if they can use a gentler product, opting to use this medication as a last resort.

Final Phentermine Ranking Calculations

Here’s the breakdown of how we ranked Phentermine. For more information about our ranking system, visit our page about How We Decide On the Best Diet Pill Rankings.

Phentermine Total Score: 9.4/10

Ingredient Safety

• Possibly Unsafe Ingredients: 2 points deducted because Phentermine has been associated with a spectrum of side effects from mild to severe ( and interacts with nearly 500 other medications (
• Banned Ingredients: No deductions.
• Ingredients studied and proven safe: 0.1 point added because Phentermine hydrochloride has been studied and found safe when prescribed and used appropriately while under a doctor’s supervision. (

Formula Effectiveness

• Ingredients not studied in reputable clinical research: No deductions.
• Ingredients proven ineffective: No deductions.
• Ingredients shown in reputable studies to be potentially beneficial to weight loss: No additions.
• Ingredients clinically proven for weight loss in reputable research: 0.3 points added as Phentermine hydrochloride has been studied and is FDA approved as an obesity drug (

Overall Phentermine User Reviews

• Average user rating: 1 point added for an average user review of over 4 stars (


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