Adipex: The #1 Brand of Phentermine Weight Loss Pills

Interested in learning more about Adipex diet pills? Click on a topic below to jump to a specific section, or simply scroll down to start from the beginning!


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What is Adipex?

Adipex diet pills

Adipex-P® is the most common brand of phentermine, a popular prescription weight loss medication. It is commonly referred to as Adipex or Adipex P.

Adipex supports overweight and obese patients’ efforts to reach a healthier weight. It helps you shed extra pounds by suppressing appetite and increasing energy. In combination with healthy diet and exercise, Adipex can help you transform your lifestyle and reach your weight loss goals.

The active ingredient in Adipex is phentermine hydrochloride (phentermine HCl). Phentermine HCl is a powerful stimulant and has a chemical structure to amphetamines. For this reason (and its addictive potential), phentermine is a controlled substance. However, like all phentermine brands, Adipex is NOT an amphetamine and it is legal to take with a doctor’s prescription.

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How does Adipex work?

Phentermine HCl – the main ingredient in Adipex – is a sympathetic amine. It works by triggering your brain to simulate a stress response like the "fight or flight" reaction. This feedback suppresses appetite and boosts energy, both of which help you lose weight. When you have fewer cravings, get full faster and enjoy plenty of energy to exercise, it’s easier to slim down. Still, it remains important to develop healthy, sustainable habits while taking Adipex. Like any other weight loss medication, Adipex works best when combined with healthy diet and regular exercise.

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Who Takes Adipex?

what is Adipex used for

Adipex is a short-term treatment for exogenous obesity, or the obesity caused by improper energy balance. Specifically, consuming more calories than you expend over time. This imbalance can result from eating too much or moving too little, or both. Adipex is not designed to treat obesity caused by other medical problems.

Adipex is an option for patients with a BMI ≥30 (obese), or a BMI ≥27 (overweight) in the presence of other weight-related conditions. However, it is not appropriate or safe for all populations. For example, due to safety concerns, you cannot take this medication if you have a history of cardiovascular problems or if you are pregnant, breastfeeding or planning to become pregnant. It is also dangerous to combine Adipex-P with many other medications.

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Where to Buy Adipex

Adipex is a prescription medication, so the only way to legally buy phentermine is with a valid doctor’s prescription.

Up until 2005, buying Adipex online was easy and legal. At that time, doctors could prescribe Adipex to internet users without physically meeting them face-to-face. Once you answered this quick questionnaire and paid for your "virtual consultation", you could order Adipex online and receive it at home. The Adipex prescribed was manufactured in the USA and shipped from real pharmacies.

In 2005, however, new regulations were implemented and prescribing Adipex online became illegal. You must now participate in an in-person doctor’s appointment before receiving a script for Adipex. This is to help protect consumers from phentermine’s potentially-dangerous side effects, as well as minimize abuse of controlled substances. At this point, any website claiming to sell real Adipex without a prescription is either not selling Adipex, or selling it illegally.

You can, however, buy Adipex online if you already have a current and valid doctor’s prescription. Online pharmacies are still allowed to sell Adipex. Simply visit your usual online pharmacy and follow their process. You will need to enter your personal details and the number of your prescription to be allowed to finalize your purchase.

If you do not have an Adipex prescription from your doctor, you can’t purchase Adipex online. However, recommends Phen Caps to help you achieve your weight loss goals. Phen Caps are designed to suppress appetite and boost energy using all-natural ingredients. Because they do not contain any phentermine HCl, Phen Caps are legally available online and without a prescription.

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Your First Doctor’s Appointment

adipex contraindications is adipex safe

It is critical that you stay open and honest with your physician during the initial consultation. During your prescribing appointment, make sure to discuss the following points with your doctor:

  • All current and recent medications and supplements, plus their dosages. Your doctor especially needs to know if you’ve taken a monoamine oxidase inhibitor (MAOI) within the past 14 days.
  • The duration of your Adipex prescription. Phentermine cannot be taken for long periods of time.
  • Your diabetes management, if relevant. Your insulin or medications may need to be adjusted while taking Adipex.
  • Your overall health. Double-check that your doctor has completed a thorough check-up to make sure the obesity isn’t due to an underlying health problem. Phentermine may not be right for you if you have a condition such as hyperthyroidism.
  • Your mental state. Alert your doctor if you are prone to becoming severely nervous/agitated.
  • Your eyes. Warn your doctor of any glaucoma condition.
  • Your alcohol consumption. It is not advisable to drink while taking Adipex. This medication is not recommended for people with a history of dependency on drugs or alcohol.
  • Pregnancy. You should not take phentermine while pregnant, breastfeeding or trying to become pregnant.

To read more about the precautions and contraindications of phentermine, please click here.

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What does Adipex look like?

Adipex is available in both tablet and capsule form.

Adipex tablets

Adipex tablets are blue and white with an oblong shape. Each tablet is scored and embossed with "ADIPEX-P" and "9-9". Adipex tablets are packaged in bottles of 30.

Adipex capsules

Adipex capsules are two colors. One end is opaque bright blue and the other end is opaque white with two dark blue stripes. Each capsule is imprinted with "ADIPEX-P" and "37.5". Adipex capsules are packaged in bottles of 100.

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Adipex Dosage

The standard dose of Adipex is 37.5 mg taken once daily. It is intended as a short-term treatment for obesity, so this medication should not be taken for more than 12 weeks at a time. If your doctor feels you could benefit from more time on Adipex, he or she may assess the possibility of additional rounds of phentermine after a break. Taking breaks is necessary to reduce risk of addiction and increase effectiveness.

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How to Take Adipex

Adipex is usually taken in the morning, either before breakfast or 1-2 hours after the first meal. Certain patients, however, are directed to split their Adipex-P tablet in half. Some take just half a pill (18.75 mg) per day, while others take the two halves of their Adipex throughout the course of their day. This second option is most common in people who struggle with afternoon or nighttime cravings. You should avoid taking Adipex late at night or just before bed because it can cause insomnia.

It is important to talk about schedule and dosage with your doctor when he or she writes your prescription for Adipex. If you have an unusual schedule (e.g. shift work), it is especially important to discuss your typical daily routine and complications with the prescribing physician. By sharing this information, you can work together to establish a phentermine schedule that will function best for you – and minimize unnecessary side effects.

Never adjust your Adipex schedule or dosage without first speaking with your doctor.

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Adipex Overdose

adipex overdose

Overdosing on Adipex – or any brand of phentermine – can have serious consequences. If you suspect a phentermine overdose, call emergency services or seek immediate medical attention. The symptoms and severity of an Adipex overdose depend on various factors including how much Adipex was ingested, prior health, and whether it was taken with food, alcohol or other drugs.

Symptoms of an Adipex or phentermine overdose include:

  • Confusion
  • Violent outbursts
  • Labored/rapid breathing
  • Tremors
  • Panic
  • Hallucinations
  • Restlessness
  • Irregular heartbeat
  • High or low blood pressure
  • Nausea or vomiting
  • Diarrhea
  • Abdominal cramping
  • Seizures
  • Coma

If you or someone you know may have overdosed on phentermine, call emergency services or poison control immediately and seek professional medical attention.

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Adipex Side Effects

Adipex is highly effective for weight loss, but it can also cause many side effects – ranging from relatively mild to very severe. The harshness of Adipex side effects differs depending on individual tolerance to phentermine, medical history, overall health, lifestyle choices and the patient’s adherence to prescribing instructions. So, while some people experience intense reactions, others have no Adipex side effects at all.

What are the side effects of Adipex?

In a recent forum poll, the top 5 side effects reported by current or recent users were:

  1. Dry mouth (xerostomia)
  2. Trouble sleeping (insomnia)
  3. Constipation
  4. Headache
  5. Dizziness

The graph below includes percentages for the number of poll respondents who experienced each of phentermine’s most common side effects:

phentermine forum side effects poll

The absolute most common side effect of Adipex is dry mouth. Other common reactions include:

  • Insomnia
  • Constipation
  • Dizziness
  • Impotence
  • Changes in libido
  • Fatigue/weakness
  • Excess energy
  • Headache
  • Diarrhea
  • Nausea

Side effects usually occur most at the beginning of taking the Adipex diet pill, as your body is trying to adjust to the medication and reacts to the ingredients.

Although they occur less frequently, Adipex can also cause some very severe reactions. Symptoms of these potentially life-threatening side effects include:

  • Fainting
  • Swelling of feet or ankles
  • Trouble breathing
  • Extreme weakness/inability to carry-out daily activities
  • Chest or lung pains

If you or someone you know experiences any of these reactions while taking Adipex, call emergency services or get to a hospital right away. These symptoms can indicate a very severe, sometime fatal, reaction to phentermine.

It is also possible to have an allergic reaction to Adipex, just like any other medication. Some signs of an allergic reaction to Adipex or phentermine include:

  • Severe dizziness
  • Trouble breathing
  • Itching
  • Swelling
  • Rash
  • Chest pain

If any of these symptoms occur while taking Adipex, seek medical attention right away.

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Adipex Results

Adipex is a highly effective weight loss medication for those who are looking to lose weight fast. It works by suppressing appetite, curbing food cravings, and by increasing energy. In this way, it enables motivated dieters to lose weight easier and faster. Every individual is different, so the results of Adipex vary depending on the person. The medication will never affect everyone identically since we all have different body types, eating habits, metabolisms, genetics, and so on.

In general, Adipex-P users experience a spectacular weight loss during the first week. This initial, rapid loss is most often due to a significant drop in water weight. Between shedding the fluid contained in your body’s carbohydrate stores and a dramatic decrease in dietary sodium and calories, some people see losses of up to 10 pounds in these first few days.

Thereafter, weight loss typically slows. After a few weeks of taking the medication, some patients begin to report weight loss plateaus. This occurs because the body gets used to Adipex and the phentermine is no longer as effective.

Your results on Adipex P would be expected to mirror (or closely match) the results you would achieve on generic phentermine weight loss pills.

To maintain your weight loss, it is important to make healthy, sustainable changes to your diet and exercise habits. Even though Adipex is a short-term medication, weight loss is not a short-term commitment. Once you’ve dropped the weight with phentermine, it’s important to continue to monitor portions, make healthy dietary choices and incorporate regular physical activity into your routine to preserve weight loss. If you go back to your old habits, your old weight will almost certainly come back as well.

Some users find that adding a dietary supplement, such as Phen Caps, can also help keep the weight off after their Adipex prescription has ended.

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Adipex Before and After

You now know the facts about Adipex prescribing, dosage, side effects and results. Still curious about real users’ experiences with this prescription weight loss drug? Here are the stories of two women who took Adipex, and a little about their success stories!


Starting Weight: 204 lb --> Current Weight: 149 lb --> POUNDS LOST: 55

Kristin started her weight loss journey to be healthy for herself and her daugster. She now loves being able to shop for smaller clothes and advises others to believe in themselves. To read her full story, click here.

Kristin Vivenzio's Picture Kristin Vivenzio's Picture


Starting Weight: 230 lb --> Current Weight: 184 lb --> POUNDS LOST: 46

Neva decided to ask her doctor about Adipex after being diagnosed with high blood pressure, and then type 2 diabetes soon after. She hated throwing away all of her expensive clothes, but loves being to slip into the size she wore at her wedding! To read Neva’s full story, click here.

Neva's Picture Neva's Picture

Visit our success stories page to read more phentermine success stories!

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Adipex Reviews

Over the past 15 years, hundreds of real phentermine users have submitted their reviews and successes with Adipex weight loss pills. Now we’re committed to sharing that information with you!

To see what past and present phentermine users thought about the medication, you can visit our reviews section to read dozens of honest opinions about Adipex.

Here’s an example of the types of reviews you will find in the phentermine reviews section:

adipex reviews

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Who Makes Adipex?

GATE Pharmaceuticals manufacture Adipex-P. GATE Pharmaceuticals is a division of TEVA Pharmaceuticals USA , which is a subsidiary of Teva Pharmaceutical Industries, Ltd.

Adipex diet pills are manufactured by Gate Pharmaceuticals - now part of Teva Pharmaceuticals, the world leader in generic drugs - who have been marketing the diet pill since 1990. Teva is located in 13 states within the USA, Puerto Rico, Canada and The District of Columbia with more than 9,000 employees. Their worldwide headquarters are located in Israel. Teva is one of the largest makers of generic pharmaceutical products in the world and is found in 60 countries to date.

adipex logo teva logo

The contact information for GATE Pharmaceuticals is:

Teva North America
1090 Horsham Road
North Wales, PA 19454 USA
Tel: 888-TEVA-USA (888-838-2872)

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In the past, doctors were recommending a drug "cocktail", where they mixed phentermine diet pills, such as Adipex, with another medication called fenfluramine, a very effective anorectic drug. This drug combination was known under the name Phen-Fen.

The combination was extremely effective in helping people lose weight very fast, but it also proved harmful for some people who took it. The main side effects were problems with the heart and lungs, including primary pulmonary hypertension (PPH). Fenfluramine was finally taken out of the market in 1997, while Adipex continues to be authorized solely upon prescription.

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Good to know

  • If you want to buy Adipex Online, please visit Where to buy Adipex
  • We also recommend the Adipex alternative, Phen Caps. Visit to order Phen Caps Online

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