Phentermine 37.5 mg: the most popular phentermine dosage

Phentermine is available in a variety of dosages, ranging from 8 mg to 37.5 mg. However, phentermine 37.5 is by far the most commonly prescribed phentermine. So, why is it so popular? Here we explain more about the different dosages of phentermine and why 37.5 mg is the most prescribed type of phentermine.

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Dosage Options

Although international brands such as Duromine are available in higher dosages, the phentermine available in the US ranges from 8 mg to 37.5 mg. Phentermine 37.5 is therefore the highest dosage available at present in the US.

phentermine dosage

The mg or milligram amount refers to the amount of phentermine hydrochloride (phentermine HCL) in each capsule or tablet. Phentermine HCL is the active ingredient of phentermine and phentermine brands such as Adipex. Phentermine 37.5 therefore contains 37.5 mg of phentermine HCL per tablet or capsule. Capsules and tablets contain other ingredients but these are inactive 'filler' ingredients which are not taken into account when referring to the phentermine dosage.

Generic phentermine refers to phentermine made by a variety of pharmaceutical companies under the name 'phentermine', as opposed to any brand name. Generic phentermine comes in 15 mg, 30 mg, and 37.5 mg dosages. While phentermine capsules are available in 15 mg, 30 mg and 37.5 mg, phentermine tablets are only available in 37.5 mg. However, some doctors choose to prescribe the 37.5 mg tablets to be split in half, taken either as two doses of 18.75 mg during the day, or as half a tablet per day.

The most well-known phentermine brand, Adipex, comes in both capsule and tablet form, but is only available in the maximum dosage of 37.5 mg. Adipex is therefore a branded version of phentermine 37.5.

Why Is Phentermine 37.5 mg So Popular?

In general, doctors will prescribe the lowest dosage of a medication needed to provide the desired effects. However, in the case of phentermine it is quite typical for patients to start off with phentermine 37.5 mg for these reasons:

  • Phentermine tablets are only available in the maximum dosage of 37.5 mg. Phentermine tablets are more commonly prescribed than capsules mainly because they are cheaper, so patients prescribed phentermine tablets will therefore take this concentration of phentermine.
  • The most popular phentermine brand, Adipex, is only available as 37.5 mg in both capsule and tablet form.
  • As phentermine is intended for short-term use, both doctors and patients often find that taking the highest dosage is the best way to maximize the patient's limited time on the medication. So, if you're new to phentermine and you've been prescribed phentermine 37.5 mg, this is actually quite common.
  • Phentermine 37.5 tablets can be split in half so that patients can start with a lower dosage and work up to 37.5 mg, which is not possible with capsules.

Is Phentermine 37.5 For Me?

phentermine 37.5 mg for me

Phentermine 37.5 mg is the most popular and most commonly prescribed phentermine. However, this may not be the best choice for everyone. Due to individual differences in the way our bodies metabolize drugs, this does not mean that taking high dosages will be more effective for you. With phentermine 37.5, both the side effects and desired effects can be too strong for many people. For this reason, the way that phentermine tablets can be split in half means that your dosage can easily be reduced if necessary.

By comparison, although lower dosages of phentermine tend to give patients fewer side effects, they may not always give patients the desired effects of appetite suppression and added energy to a sufficient enough level for them to successfully lose weight. Therefore, it's a case of getting the right phentermine dosage for the individual, which can often be a balancing act between minimizing side effects and maximizing weight loss. The right amount for you is one that helps you to control your appetite, boosts your energy and motivation, but that doesn't cause you any unmanageable side effects.

If a lower mg phentermine is working for you to suppress appetite and add energy and is also helping you to lose weight then this is a good thing, as it means your body is not building up as much of a resistance to the phentermine as it would if you were to take a higher concentration of phentermine. It's also likely that any side effects you're experiencing are mild and manageable. By comparison, those who start off on phentermine 37.5 mg often find that they suffer with much more severe side effects, which can in turn stall their weight loss progress. For example, side effects such as insomnia can negatively affect weight loss as sleep is crucial to ensure that your body is burning fat and keeping a steady metabolism. It's also not uncommon for people to stop taking phentermine altogether due to the extremity of side effects for some patients. You should therefore trust that your doctor will prescribe you with the most suitable phentermine dosage for you.

Here are the most popular phentermine 37.5 mg tablets and capsules:

  • Adipex-P 37.5 mg tablets

    Manufactured by Teva Pharmaceuticals USA, Adipex-P is the most popular brand of Phentermine. This tablet is characterized by its blue spleckles and was copied many times by other brands, as you can see below. This tablet is relatively small and can be easily swallowed.

    Please visit Adipex-P for more information.

    Phentermine Adipex-P 37.5 mg tablets
  • Adipex-P 37.5 mg capsules

    Also manufactured by Teva Pharmaceuticals USA, this capsule has the same strength as the tablet. It is known to be less popular than Adipex 37.5 tablets, probably because it doesn't have the famous blue speckles that people think contain the phentermine active ingredient.

    Some doctors prefer prescribing capsules because they are easy to swallow.

    Phentermine Adipex-P 37.5 mg capsules
  • Phentermine 37.5 mg tablets by Qualitest Pharmaceuticals

    These Phentermine 37.5 mg tablets are manufactured by Qualitest Pharmaceuticals, a small generic manufacturer which was recently acquired by Endo Pharmaceuticals. As you can see, this tablet looks like the Adipex 37.5 mg tablet although its blue speckles are darker.

    Please visit Qualitest's official site for more information.

    Phentermine 37.5 mg tablets qualitest pharmaceuticals
  • Phentermine 37.5 mg tablets by Actavis USA

    Previously known as Purepac Phentermine, it is now manufactured and distributed by Actavis Pharmaceuticals, a leading generic pharmaceutical manufacturer. These tablets are easy to identify thanks to their R-316 imprint. They are small, smooth and easy to swallow.

    Before being acquired by Actavis, Purepac was the largest manufacturer of Phentermine 37.5 mg tablets.

    Phentermine 37.5 mg tablets actavis usa
  • Phentermine 37.5 mg tablets by Able Laboratories Inc

    Able Laboratories, Inc. was a developer and manufacturer of generic pharmaceutical products in tablet, capsule, liquid and suppository dosage forms.

    However in May 2005, the firm went bankrupt and suspended manufacturing and distributing its line of Phentermine tablets.

    Phentermine 37.5 mg tablets able
  • Phentermine 37.5 mg tablets by Actavis Totowa LLC

    Actavis Totowa LLC was previously known as Amide Pharmaceuticals, a company based in Little Falls, New Jersey, before it was purchased by Actavis in 2006.

    In the early 2000, Amide Phentermine 37.5 mg tablets were very popular because they were sold by online pharmacies.

    Patients like this tablet because it's very similar to the Adipex 37.5 mg tablet.

    Phentermine 37.5 mg tablets actavis towata
  • Phentermine 37.5 mg capsules by Actavis (former Amide Pharmaceuticals)

    Manufactured by Actavis Totowa LLC, these capsules are very similar in shape and color to Adipex 37.5 mg capsules. They are usually sold as pure generic Adipex and patients often refer to them as "cheap adipex".

    Phentermine 37.5 mg actavis amide
  • Phentermine 37.5 mg tablets by KVK-Tech

    KVK-Tech is a small manufacturer of generic Phentermine which has grown very fast in the last couple of years. They focus on a few products, mostly diet pills.

    These Phentermine 37.5 mg tablets are a substitute to the Adipex 37.5 mg tablets, as you may have noticed. The K-25 imprint is more and more popular, in particular with the forums, which shows that the KVK-Tech Phentermine is becoming a key player in the diet pill business.

    Phentermine 37.5 mg tablets KVK-Tech
  • Phentermine 37.5 mg capsules by KVK-Tech

    These 37.5 mg capsules are here to compete with Adipex 37.5 mg capsules and the capsules by Actavis. is constantly receiving positive feedback from physicians who tend to think that these generic phentermine solutions are as efficient as the branded ones.

    Phentermine 37.5 mg capsules KVK-Tech


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