By Dr. Karen Viera - Last updated Sept. 3, 2018
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!
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.
If you are overweight or obese, Adipex 37.5 can help you reach a healthier weight. The medication supports weight loss by suppressing appetite and increasing energy. In combination with healthy diet and exercise, it can help you transform your lifestyle and reach your weight loss goals faster.
The active ingredient in Adipex diet pills is phentermine hydrochloride(phentermine HCl). Each capsule or tablet contains 37.5mg of this substance.
The inactive ingredients include: croscarmellose sodium, lactose monohydrate, magnesium stearate, microcrystalline cellulose, and blue sugar spheres.
Phentermine HCl is a powerful stimulant and it has a chemical structure that is similar to amphetamines. This means that is potentially addictive and for this reason, Adipex is class IV a controlled substance .
Yes. Due to phentermine’s chemical similarity to amphetamines, this medication can produce a false-positive for amphetamines/meth on a standard drug test . However, phentermine is NOT an amphetamine.
The difference between the molecules in phentermine and amphetamine is a single methyl group (CH3). More specifically, phentermine contains two methyl groups, while amphetamine contains a single hydrogen (H) atom in place of one of the methyl groups.
The next logical question is: “how long does Adipex stay in your system”?
Phentermine has a half-life of about 16-31 hours (average is 20 hours), which refers to how long it takes the body to break down (metabolize) half of a dose . It takes several half-lives for a does to be completely broken down, which means you can expect to test positive for phentermine on a urine drug screen for about 4-7 days after taking your last dose of this medication. This window increases if you were taking the drug for a long time or at higher-than-normal doses.
Good to Know
Phentermine HCl – the main ingredient in Adipex – is a sympathomimetic amine, which means it stimulates the nervous system .
More specifically, it promotes the release of norepinephrine, which is a neurotransmitter (chemical in the brain) that evokes a stress response such as the “fight or flight” reaction and it also reduces feelings of hunger . In addition, phentermine stimulates the release of adrenaline (epinephrine) to other areas of the body and this leads to the breakdown of stored fat . These processes subsequently suppress the appetite and boost energy, which supports weight loss. When you have fewer cravings, feel full faster, and enjoy plenty of energy to exercise, it is easier to slim down.
Similar to other weight loss medication, Adipex works best when it is combined with a healthy diet and regular exercise. It is important to develop healthy, sustainable lifestyle habits during your treatment as this is only a short-term medication.
Adipex is ashort-term treatment for exogenous obesity, or obesity that is caused by consuming more calories than you burn over time. This imbalance can occur from eating too much, moving too little, or due to a combination of both of these factors. This medication is not designed to treat obesity caused by other medical problems.
These weight loss pills are an option for patients with a BMI ≥ 30 (obese), or a BMI ≥ 27 (overweight) in the presence of other weight-related conditions. BMI refers to body mass index.
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.
Adipex-P is the most well-known brand of phentermine, and it remains the most-prescribed appetite suppressant in the US, but that does not mean it is the only option. Keep reading to learn how this medication compares to other prescription weight loss drugs.
One of the most common questions people ask is, “Is Adipex phentermine?” The answer is yes – Adipex is a popular brand name for phentermine diet pills. This means that if you’re comparing Phentermine to Adipex, you’re really comparing a brand name to the generic form of the medication. Generic phentermine is typically cheaper and available in a wider variety of doses.
Contrave contains a combination of naltrexone and bupropion extended-release to suppress appetite and control cravings [1, 5]. It can be taken for longer periods of time than Adipex-P and it is not a controlled substance . Contrave can, however, cause a variety of serious side effects.
Bontril is a popular brand of phendimetrazine, which is a drug that promotes weight loss. It is similar to Adipex in that it stimulates the nervous system, thereby triggering a biological stress response. Due to its effect on the nervous system, it is classified as a class III controlled substance . Although Bontril and Adipex are very similar, people respond to them differently and some individuals experience better outcomes with Bontril.
Didrex is the brand name for the benzphetamine, also known as benzphetamine HCl. It is a prescription appetite suppressant, and similar to Adipex and Bontril, Didrex decreases the appetite and boosts energy by enhancing the activity of the central nervous system. More specifically, it promotes the release of dopamine and noradrenaline, which are neurotransmitters (chemicals in the brain) that play a role in appetite suppression . It is a class III controlled substance, but Adipex is more potent than Didrex.
As an over the counter alternative to Adipex, Phentermine.com recommends Phen Caps to help you achieve your weight loss goals. Phen Caps contain all-natural ingredients that suppress the appetite and boost energy. Furthermore, they do not contain phentermine HCl, which means that Phen Caps are legally available online and without a prescription.
Phentermine is a controlled substance and the only way to legally buy Adipex is with a valid doctor's prescription.
You cannot purchase Adipex online or over the counter without a prescription.
Yet, after you obtain a current and valid doctor’s prescription, you can fill the prescription online through the pharmacy you typically receive your medication from.
Be open and honest with your physician during the initial consultation. In particular, make sure to discuss the following points with your doctor:
To read more about the precautions and contraindications of this weight loss medication, please click here.
This prescription appetite suppressant is available in tablet and capsule form.
Adipex tablets are blue and white with an oblong shape. Each tablet is scored and embossed with "ADIPEX-P" and "9-9". The bottles contain 30 tablets.
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". The capsules are packaged in bottles of 100.
Most patients take Adipex-P 37.5 mg once a day in the morning, either before breakfast or 1-2 hours after the first meal. A lower dose of this medication (e.g. Adipex 15 mg) is NOT available, but some people split their tablet in half.
People who split their tablets may take just half a pill (18.75 mg) per day, or they may take the two halves throughout the course of the day. This second option is most common in people who struggle with afternoon or nighttime cravings.
You should avoid taking this medication late at night or just before you go to bed because it can cause insomnia.
It is important to talk about an Adipex schedule and dosage with your doctor when he or she writes your prescription. By sharing this information, you can work together to establish a phentermine schedule that will function best for you – and minimize unnecessary side effects.
If you have an unusual schedule (e.g. shift work), it is especially important to discuss your typical daily routine with the prescribing physician.
When taking Adipex, focus on establishing healthy eating habits that you can maintain over a long period of time, especially since this medication is typically only prescribed for up to 3 months. In addition, it may be tempting to follow the latest diet trends or to slash calories dramatically, but try to avoid any extreme measures (unless they are specifically recommended by your doctor).
Instead, take advantage of the weight loss-boosting potential of Adipex and make sure you begin to incorporate healthy eating habits such as portion control and nutritional balance into your daily routine. There is no specific or optimal “Adipex diet”, but regular exercise and eating nutritious meals can help you maintain your ideal weight.
For more information about healthy eating and diet tips, head over to the phentermine.com blog!
It is prescribed as a short-term treatment for obesity, which means this medication should not be taken for more than 12 weeks at a time. If your doctor believes that you could benefit from taking this medication for a longer period of time, he or she may assess the possibility of additional rounds of Adipex (phentermine) after a break. Taking breaks is necessary to decrease the risk of addiction and to increase its effectiveness.
Overdosing on phentermine can have serious consequences. If you suspect an overdose, call emergency medical services or seek immediate medical attention.
The symptoms and severity of an Adipex overdose depend on various factors including how much medication was ingested, prior health, and whether it was taken with food, alcohol or other drugs.
Symptoms of a phentermine overdose include:
This medication is highly effective for weight loss, but it can also cause many side effects that range from relatively mild to very severe.
The severity of Adipex side effects differs depending on individual tolerance to phentermine, medical history, overall health, lifestyle choices, and the patient’s adherence to the prescribing instructions. In addition, while some people experience intense reactions, others have no side effects at all.
In a recent poll of phentermine users, the top five Adipex-P side effects reported were:
The graph below includes percentages for the number of poll respondents who experienced each of phentermine’s most common side effects:
As you can see, dry mouth is the most common Adipex side effect. Other common reactions include:
Side effects usually occur at the start of treatment when your body is trying to adjust to the medication.
Although severe side effects occur less frequently while taking this medication, it can cause some dangerous reactions.
Symptoms of the potentially life-threatening side effects include:
It is possible to have an allergic reaction to Adipex-P and some of the signs include:
Adipex is a highly effective weight loss medication for those who are looking to lose weight fast [1, 9]. It works by suppressing the appetite, curbing food cravings, and increasing energy [1, 4, 9]. By doing so, Adipex enables motivated dieters to lose weight easier and faster. However, the results often vary depending on the person because every individual is different. More specifically, we do not observe identical results for each person who takes this medication because we all have different body types, eating habits, metabolisms, and genetics.
In general, patients experience a spectacular amount of 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 down. 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 phentermine’s effect isn’t as dramatic.
Adipex weight loss results would be expected to mirror (or closely match) the results you would achieve by taking generic phentermine weight loss pills.
To maintain your weight loss, it is important to make healthy, sustainable changes to your diet and exercise regularly. Even though this is a short-term medication, weight loss is not a short-term commitment. Once you’ve dropped the weight with phentermine, it is important to continue to monitor portions, make healthy dietary choices, and incorporate regular physical activity into your routine in order to maintain your weight loss. If you go back to your old habits, your old weight will almost certainly return as well.
Some users find that adding a dietary supplement, such as Phen Caps, to their daily regimen can also help keep the weight off after their phentermine prescription has ended.
You now know the facts about appropriate prescribing, dosage, side effects, and results. If you’re still curious about real users’ experiences with this prescription weight loss drug, or wondering “does Adipex really work?”
Here are the inspiring Adipex weight loss stories of two real women!
Starting Weight: 204 lb | Current Weight: 149 lb | POUNDS LOST: 55
Kristin started her weight loss journey to be healthy for herself and her daughter. Now she loves being able to shop for smaller clothes and encourages others to believe in themselves. To read her full story, click here.
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 type 2 diabetes soon after. She hated having to throw 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.
Visit our success stories page to read more Adipex weight loss stories!
Over the past 15 years, hundreds of real phentermine users have submitted their reviews and success stories 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 and stories.
Adipex diet pills are manufactured by Gate Pharmaceuticals, which is now part of Teva Pharmaceuticals USA. They have been marketing this 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 is located in Israel. Teva is one of the largest makers of generic pharmaceutical products in the world and is located in 60 countries to date.
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)
Good to Know
3. Food and Drug Administration, Washington (USA): QSYMIA (Phentermine HCL and Topiramate), Application number: 22590Orig1s000, Clinical Pharmacology and Biopharmaceutics Review. Retrieved from https://www.accessdata.fda.gov/drugsatfda_docs/nda/2012/022580Orig1s000ClinPharmR.pdf
9. Weintraub M, Hasday JD, Mushlin AI, Lockwood DH. A double-blind clinical trial in weight control. Use of fenfluramine and phentermine alone and in combination. Arch Intern Med. 1984;144(6):1143-1148.