Phentermine and Adipex FAQ

Phentermine and Adipex FAQ

Phentermine is the most popular weight loss drug, available in USA by prescription only. Pharmacies offering Phentermine in two forms - generic and brand name - Adipex P. Generic Phentermine normally looks like white tablet with blue specks and Adipex P comes in blue and white capsules. Both, generic and brand name comes with 37.5 mg of active ingredient - Phentermine HCL.

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Description & Specs


Phentermine is one of the oldest weight loss drugs on the market. It was first made nearly 70 years ago and was once widely used to help people lose weight. Phentermine is very similar to amphetamine and is considered to be a brain stimulant. When ingested, phentermine diminishes appetite and has a thermogenic effect (helps the body burn off calories). Phentermine is also sold as Suprenza, Adipex-P and Ionamin. Previously Phentermine was also sold as Fastin, but this brand is no longer available in the USA.

Does one need a prescription to buy phentermine?

Phentermine is classified as a controlled substance and is only available with a doctor’s prescription. Experts recommend that the drug should not be taken for more than 3 weeks. To get the best results from phentermine, it is highly recommended that one also decrease intake of calories and perform some type of exercise.

Who should take phentermine?

Phentermine is generally recommended for obese people with a body mass index greater than 30. The drug is only prescribed after a trial of diet control and exercise has failed to reduce weight. Click here to learn more about obesity...

Is phentermine addictive?

Yes, phentermine is addictive when taken for prolonged periods. Others may become addicted when they take high doses in a short time. When people addicted to phentermine stop taking it, they may develop depression, anxiety or extreme fatigue.

Are there any FDA warnings about phentermine?

The FDA has issued a warning that phentermine should not be taken for more than 2-3 weeks. In addition, other similar drugs or herbal products should not be consumed with phentermine. Individuals who have the following medical disorders should also not take phentermine:

  • Glaucoma
  • Heart disease
  • History of drug abuse
  • Uncontrolled blood pressure
  • Moderate to severe depression, anxiety or irritability
  • Individuals on Monoamine oxidase inhibitors
  • Overactive thyroid
  • Uncontrolled diabetes


What type of monitoring is required while taking phentermine?

In general, your healthcare provider should monitor your blood pressure, kidney function and status of your heart valves on a regular basis. This monitoring should be done every few weeks.

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When should I see my healthcare provider?

If your blood pressure starts to increase, if you develop chest pain, feel faint, have difficulty breathing or develop swelling of your feet or legs, you should stop taking phentermine and see your healthcare provider.

How long do effects of phentermine last?

The effects of phentermine are not permanent. Once you have lost weight, you need to watch your diet and continue exercise. If you do not change your lifestyle, you will regain your weight.

What are side effects of phentermine?

Some people who take phentermine may experience the following aside effects:

  • Constipation or diarrhea
  • Upset stomach
  • Dry mouth
  • Headache
  • Anxiety
  • A jittery sensation
  • Itching
  • Alteration of taste
  • Decreased libido
  • Difficulty sleeping
  • Difficulty thinking, concentrating or being alert
Most of these side effects are temporary but if they persist, you should seek emergent care.


What serious adverse effects does Phentermine have?

Even though phentermine is relatively safe, it may cause serious adverse effects in the rare individual. These serious effects include:

  • Chest or jaw pain which may suggest a heart problem
  • High blood pressure
  • Swelling in the feet or ankles
  • Very fast heart rate
  • Shortness of breath
  • Tremor
  • Difficulty walking
  • Changes in behavior- anxiety, depression, hallucinating
Anyone who experiences these adverse effects should immediately go to the nearest emergency room and stop taking phentermine. If you suddenly stop taking phentermine after having been on it for a long period, you might experience symptoms of withdrawal, such as depression or fatigue.


Can I take alcohol with phentermine?

It is highly recommended that you not take any type of alcoholic beverage with phentermine. Alcohol increases the risk of adverse reactions like stomach upset, diarrhea and altering mood.

What if I miss my daily dose of phentermine?

If you miss one single dose of phentermine, you should take it as soon as you remember it. If the timing is too close to the next dose, then do not take the missed dose but only the take the scheduled dose. Never take two tablets at the same time.

How does Phentermine Work?

The actions of phentermine occur in the brain and in body (muscles and soft tissues). In the brain, phentermine suppresses the appetite control center, so one does not feel hungry. In the body, phentermine also induces a thermogenic effects-meaning it helps burn off calories.

Phentermine and drug interactions

Phentermine does interact with many other medications. So before you take phentermine, you should tell the doctor about all your medications. Common medications that interact with phentermine include Adderall, Didrex, Focalin, Dexedrine, Vyvnase, Desoxyn, Ritalin, Bontril, Nardil, Emsam and Meridia. These interactions can lead to a higher incidence of adverse effects and can even be life threatening.

Phentermine and Pregnancy

The majority of drugs are not safe during pregnancy and the same applies to phentermine. Phentermine can cause harm to the fetus and is not recommended during pregnancy. All women of child bearing age who plan to become pregnant should avoid phentermine. In addition, phentermine is not recommended in women who breast feed.

Phentermine and Obesity

Phentermine is only meant to be used in obese people with a body mass index of 30. The drug should not be taken by others without first discussing the issue with your healthcare provider.

Phentermine for Children

Phentermine is not recommended for use in children under the age of 18. The drug is only meant for use in obese adults.

Gastric Bypass Surgery or Phentermine

Many people required to use Phentermine before going "under the knife", because their BMI is not safe for the surgery. Most people who undergo surgery for weight loss start to lose weight and there is no need to take weight loss medications. However, in order to suppress the appetite center in the brain, phentermine in low doses can be taken. It is important to speak to your healthcare provider before taking phentermine after weight loss surgery. The drug is ideal for people who continue to crave for food after surgery.

Short term Complications Associated with Phentermine Use

When phentermine is taken for a short time, one may develop adverse effects like stomach upset, constipation, diarrhea, sweating, high blood pressure and even glaucoma. However, these adverse effects do not occur in everyone and they are reversible and only temporary.

Long Term Complications Associated with Phentermine Use

The only long term effect of phentermine which is of concern is addiction to the drug; the addiction is both physical and psychological. Once addicted, there is a need to continue taking the drug. If phentermine is discontinued one can develop withdrawal symptoms. There have been no other long term adverse effects of phentermine reported.

Can I expect results to last

Phentermine does not work immediately. The weight loss starts gradually and will become obvious after the first 10 days. The weight loss will continue as long as you consume phentermine. However, once phentermine is discontinued, the weight can be regained if you do not continue to exercise and eat a low calorie diet.

Phentermine and Hypothermia

Phentermine does not cause hypothermia (low body temperature). However, it may cause mild increase in body temperature as a result of its thermogenic actions. The amount of increase in body temperature is mild and well tolerated.

Phentermine and Cancer

There is no link between phentermine and cancer. Phentermine has been around for nearly 70 years and no increase in incidence of cancer has ever been reported. Phentermine in general should not be taken by people who have cancer as it may react adversely with some of the cancer medications.

Phentermine and Diabetes

Diabetics who are obese and would like to lose weight can take phentermine. In fact diabetics tend to respond well to phentermine. However, prior to taking phentermine, all diabetics should undergo a proper exam by their healthcare provider to ensure that there is no heart disease or uncontrolled high blood pressure.

What are dosages of phentermine?

Phentermine is available in three doses: 15, 30 and 37.5 mg. Most people respond to 30 or the 37.5 mg dose. In people with medical disorders like high blood pressure, doctors will start with the low dose phentermine. The pills are available as capsules and tablets. The capsules cannot be divided whereas the tablets can be halved. The pill should be taken on an empty stomach but if you develop stomach upset, it can be taken with food. Phentermine pills are best taken first thing in the morning. If you take the pill late in the evening, it may interfere with your sleep. The tablet should be swallowed whole and not chewed. The capsule on the other hand should be allowed to dissolve under the tongue.

Can one overdose with phentermine?

Overdose is possible with very high doses of phentermine and when it is combined with other agents and alcohol. Overdose typically presents with abnormal behavior, extremes of irritability or sedation, high blood pressure, excess sweating and anxiety. If you suspect an overdose with phentermine, contact the nearest emergency center or call 911.

Where to buy Phentermine Online

Phentermine is a controlled substance and hence you can’t buy it without a prescription. There are many online stores which claim to sell phentermine. In most cases, they sell the brand names of phentermine like fastin, adipex or ionamin. Again, all these products require a prescription. Many online Canadian pharmacies do sell phentermine but the quality or quantity of these products is debatable. In addition, it is suspected that fakes and counterfeits are also common when buying medications online. Unless you know the reputation of the online store; it is not recommended that you buy your medications online.

Phentermine Reviews

There are plenty of reviews on phentermine and its ability to induce weight loss. Overall, people who changed their diet and started to exercise while taking phentermine had the most success. The amount of weight loss varied from 2-6 pounds a month. However, when the phentermine was stopped and the new lifestyle was not maintained, regain in weight was a common complaint. In some people phentermine did not work. Mild side effects which were tolerable and were reported in some individuals. Most people who lost weight mentioned that they also exercised at the same time.

What is real and fake Phentermine

Because phentermine is a relatively cheap medication and can induce weight loss, it is widely sought after obese individuals. However, the world of weight loss is also full of scams and shams. Fake and counterfeit products are common and thus it is highly recommended one only buy their pharmaceutical supplies from reputable website or retail pharmacies or health food stores. It is not possible to tell a fake pill from a real pill just by looking at it. It is best to avoid buying medications from abroad as the risk of fakes is much higher.

Herbal Phentermine - is there such thing?

There are many health food stress that sell herbal phentermine. It is claimed by these people that herbal phentermine works exactly like the prescription phentermine. Herbal phentermine does not require a prescription and costs a lot less than the prescription product. Herbal phentermine usually contains ingredients like yohimbine, synephrine, Green tea extracts, L-Carnitine, alpha lipoic acid and black pepper extracts. These agents decrease your appetite center and also help burn of excess calories. It is important to know that herbal phentermine is not approved by the FDA.

What is Adipex?

Adipex is just one other brand of phentermine. It works as an appetite suppressant and also helps burn of calories. It works best when one incorporates a low fat diet and regular exercise at the same time. Adipex also requires a physician prescription. The usual adult dose is 37.5 mg.

Where to buy Adipex?

Adipex is a brand name drug, sold only in the United States. Manufactured by Teva Pharmaceuticals and sold everywhere in the grocery stores, pharmacies and other specialty stores across the continental USA. Adipex can be bought in any retail pharmacy. There are some online pharmacies that also sell adipex but you will need to fax in a doctor’s prescription first. In general, Online sites that claim to sell adipex are more likely to sell fake products.

Can you get Phentermine without prescription or why do you need to see a doctor?

In the USA, you cannot get phentermine or its brand formulas without a doctor’s prescription. Since it is a controlled agent, the sale of phentermine is closely regulated by the DEA. Possession and sell of phentermine without a prescription can lead to monetary fines and incarceration by the Justice Department.

What's the difference between Phentermine Pills and Capsules?

There is no difference in the actual content of the active drug; the only difference is how the phentermine is formulated. With capsules, all the ingredients are contained in an inert gelatin covering. With a pill there is no external covering. A pill can be divided into two doses but this is not possible with a capsule. Pills usually have to be swallowed whole, whereas a capsule can be placed underneath the tongue.

Phentermine vs. PhenObestin

PhenObestin is not an herbal product but a real pharmaceutical product but does not require a prescription; it is now a legal alternative to phentermine, which is no longer available. PhenObestin contains natural ingredients like yohimbine, synephrine, and phenyl ethylamine. These agents burn of calories and help suppress appetite. Unlike phentermine, PhenObestin can be purchased in many retail and online pharmacies. It is also a lot less cheaper than phentermine.

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