Generic Name: phentermine
Brand Name(s): Adipex-P, Oby-Cap, Suprenza, T-Diet, Zantryl
Medically reviewed by Ahmed Zayed, MD on June 19, 2018

With the significant impact that obesity has on the general population, causing a rise in the prevalence of diabetes, heart disease, degenerative joint diseases, and even early death1, appropriate treatment becomes essential. The healthcare system considered obesity a disease today2, due to the many hazardous effects the excess weight has on the body.

Adipex has become one of the most widely used prescription drugs to be used to provide a pharmaceutical approach to the treatment of obesity. Millions of people turn to weight loss supplements to help them lose excess weight, but many of the over-the-counter options are ineffective. The development of Adipex has provided a way for physicians to assist patients who are experiencing adverse health effects due to obesity through a pharmaceutical drug.

What Is Adipex?

Adipex is commonly also called Adipex P. The product cannot be purchased at a local supplement store or grocery stores, but only from pharmacies that stock this brand name of phentermine. This is the most commonly prescribed option when a patient is advised to start taking a pharmaceutical drug to help them lose weight. The product is usually prescribed in a 37.5mg dose and only includes the main active ingredient phentermine, also referred to as phentermine hydrochloride or phentermine HCI. Even though Adipex is not a type of amphetamine, the chemical structure of the phentermine hydrochloride used in the product is quite similar to that of amphetamine. This is a legal weight loss drug, but can only be legally obtained with a prescription from a physician.

How Does Adipex Work?

Knowledge of how Adipex works to assist with the treatment of obesity is important to help patients understand what this product will do to their body and whether or not it has any potential for them. The active ingredient in this drug, phentermine HCI, is a powerful stimulant. When taken regularly, it will frequently cause a stress response in the body that is similar to what is experienced during a reaction known as the body’s fight or flight response.

The result of this working action leads to two particular actions in the patient’s body:

  • They will experience an improvement in their energy levels throughout the day. This helps them feel more energized and motivated to participate in physical exercises and also helps the patient get through the day without having to rely on high-carb foods and coffee to get them through the day.
  • In addition to its energy-boosting effects, Adipex also works as a potent appetite suppressant3. This is especially useful when the patient frequently finds themselves binge eating or reaching for unhealthy snacks between breakfast, lunch, and

Possible Side-Effects Of Adipex

The most important side-effects that patients need to be aware of when they are considering the use of Adipex to help them reduce their body weight is the risk of addiction4. The active ingredient in this product is a stimulant that is known to be addictive when frequently taken, especially over extended periods of time. Additionally, many patients find that using this drug for too long causes the active ingredient to become less effective in suppressing their appetite, controlling their energy levels and providing them with a way to reduce their body weight.

Other side-effects that a patient may experience when they use this drug include dry mouth, insomnia, headaches, dizziness, dysphoria, urticaria, and psychosis. Some patients also experience constipation while taking this drug. It should be noted that a change in the patient’s libido may also occur while they are taking Adipex5.

Frequently Asked Questions About Adipex

Does Adipex show up in blood tests?

Some patients may be wondering whether the use of Adipex may cause blood tests to show that they are using a drug to help them lose weight. This drug contains an active ingredient with a chemical structure similar to amphetamine. This means that blood tests may report a positive value for the presence of amphetamine in the patient’s blood while they are using this drug to treat their obesity.

What is the optimal dosage of Adipex?

A physician will be able to provide an accurate dosage for the patient, based on their current weight, health challenges, and the goals that have been set in place for them. In most cases, the patient will be prescribed a 37.5mg dose of Adipex – one of these pills are usually to be taken daily over a period of around 12 weeks to help the client experience a suppression of their appetite and to reduce their body weight.

How to use Adipex effectively?

It is vital for a patient to closely follow the dosage instructions that are provided by their physician should they be prescribed a phentermine pill like Adipex to help them achieve a lower body weight. Not adhering to these dosage instructions may lead to a higher chance of addiction or experiencing some of the more serious side-effects that have been associated with the use of this prescription weight loss drug.

It is also vital for patients to realize that this drug is not effective on its own. For effective weight reduction, the patient will need to implement changes in their diet and physical training protocol. A healthier diet needs to be adopted, together with frequent exercises that have been designed to assist with burning excess calories in the patient’s body. Long-term use is not recommended and the use of this drug for periods longer than 12 weeks should always be accompanied by a break in-between.


Adipex has provided a pharmaceutical method for the treatment of obesity. This drug is based on amphetamine and is a type of stimulant that works in different ways to address excess weight and to make weight loss possible in certain patients. While the drug may yield some positive results, the potential side-effects of the product are considered detrimental for many qualifying patients.

PhenterPro is an excellent alternative to Adipex that does not require a prescription from a physician. This weight loss pill has been developed to target the most common causes of weight gain in users to deliver an effective approach to reducing their body weight. PhenterPro delivers a surge in energy levels, as well as an effective way to suppress the user’s appetite – without causing the adverse effects that are often experienced by patients taking Adipex.


1 X. Pi-Sunyer. The medical risks of obesity. U.S. National Library of Medicine. November 2009.

2 T.K. Kyle, E.J. Dhurandhar, and D.B. Allison. Regarding Obesity as a Disease: Evolving Policies and Their Implications. HHS Public Access. 1 September 2017.

3 G. Skopp and R. Jantos. Phentermine—a “weighty” or  a dangerous substance? U.S. National Library of Health. March 2013.

4 Multiple Authors. Addiction potential of phentermine prescribed during long-term treatment of obesity. U.S. National Library of Medicine. 17 May 2013.

5 Phentermine (By mouth). PubMed Health. 1 June 2018.


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