Phentermine facts

Phentermine is the most sought-after prescription diet medication in the US. But how much do you know about this drug? will guide you with facts about this medication.

What Is It?

It is known as anti-obesity medicine, which aids in decreasing overweight issues. It is a psychostimulant drug of the class phenethylamine, with pharmacology the same to amphetamine and is utilized clinically as an appetite suppressant. It first obtained approval from Food Drug and Administration as an appetite-suppressing pill. It also became accessible in the US the similar year as Phentermine resin, as well as Phentermine Hydrochloride in the 1970s. Lately, it was sold under the name Fastin.

Typical Brands

This pill is currently sold under various brand names that vary between nations, but the most typically known brand name is Adipex-P. It is manufactured by different pharmaceutical corporations along with different looks to differentiate between manufacturers. It’s accessible in tablet and capsule form, and also as a disintegrating oral tablet under the brand Suprenza.

How Does It Work?

This drug causes the brain to excite the adrenal glands to free norepinephrine – a type of neurotransmitter that alerts a fight-or-flight response, decreasing hunger. It also generates dopamine and serotonin, but to a lesser degree than that of norepinephrine, though at levels enough to establish a satiating effect and lessen cravings. This works outside your brain to discharge adrenaline, stimulating the body and mind to be more alert and efficient, boosting concentration and energy levels.

Precautions Before Using

Don’t utilize this pill if you’ve taken an MAO inhibitor in the previous fourteen days, as a dangerous drug interaction could happen. Further, MAO inhibitors are composed of linezolid, tranylcypromine, selegiline, rasagiline, phenelzine, and isocarboxazid.

You must not take this drug if you are pregnant or a lactating mother. You must not take it if you are experiencing following health issues:

  • A history of heart disease (stroke, uncontrolled or congestive heart failure, heart rhythm issues, coronary artery disease)
  • Overactive thyroid
  • Pulmonary hypertension
  • Glaucoma
  • Uncontrolled or severe high blood pressure
  • Alcohol abuse
  • In agitated condition

Taking the pill together with other medications for a diet like Redux or Phen-Fen can cause an infrequent fatal lung disorder known as pulmonary hypertension. If you want to take this, make sure that you pay a visit first to your doctor for recommendations. To ensure this pill is 100% safe for your health, you need to state your physician if you have the following conditions:

  • A thyroid disorder
  • Kidney disease
  • High blood pressure
  • Allergic to yellow food dye or aspirin
  • Diabetes

Take note not to share this pill with another party, specifically someone who has a history of addiction or drug abuse. Make sure to keep the medication in a place where other people can’t access to it.

How to Take the Drug?

As mentioned earlier, you need to consult your doctor first before taking the drug. Follow every direction on the prescription label and don’t take it in smaller or bigger numbers or for longer use than suggested. You will find some brand, which requires to take it on an empty stomach before breakfast or within two hours after breakfast.

In order to avoid sleep issues, you can take the drug early in the day, no later than 6 o’clock in the evening. Ensure to discuss with your physician if you’ve experienced increased hunger, which means the medication is not suitable for you. Taking more of the drug will not make it more efficient and can cause life-threating side effects in the long run.

On the other hand, if you have experienced sudden and unwanted withdrawal signs, don’t stop taking it. Consult your doctor first.

What are the Possible Side Effects?

If you have any symptoms of these side effects, get emergency medical assistance right away:

  • A headache
  • A shift in sex drive
  • Tremor
  • Feeling uneasy
  • Palpitations
  • Impotence
  • Hives
  • Unpleasant taste in the mouth
  • Dry mouth
  • Vomiting
  • Nausea
  • Euphoria
  • Insomnia
  • Dizziness
  • Overstimulation
  • Elevated blood pressure
  • Fast heart rate

Typical Withdrawal Signs

As this drug is addictive and commonly prescribed for a limited period only, a lot of those prescribed with it might find that they encountered side effects after cessation of the medication. Mostly, the common withdrawal signs include low mood, insomnia, weight gain, and fatigue. These indications are mainly associated, wherein the depressed mood you may encounter once you stop feeling the mood-increasing effects of the drug can cause some depression-related and thus fatigue if you don’t get enough sleep.

On the other hand, weight gain can then happen as a result of lack of energy to exercise, insufficient sleep and lack of focus on keeping a healthy diet.

Recommended Dosage

The recommended dosage of this medication is 1 capsule a day consumed at least 2 hours after breakfast for effective appetite control. You need to remember that late night medication must be prevented because of the chance of resulting to insomnia. This medication may interact with any alcohol. Thus, tell your physician every supplement and drug you take.

Exercise and Diet Recommendations

Phentermine is one of those weight loss drugs, and thus it will work only in conjunction with an exercise and healthy diet if long-term weight loss is wanted. Whenever prescribing this drug, your doctor must also emphasize the significance of taking this chance to utilize the drug as a tool to recreate your life into a healthy way of living.

Moreover, it does not denote working out three hours per day or fad diet. This means changing your bad practices for good ones, striving to eat clean and fresh food, and integrating more activities into your day in a way, which is sustainable and manageable in the long term.

This drug may be utilized as a short-term aid to weight loss aside from exercise, caloric restriction, and behavioral modification. Suggested only for individuals who have an initial BMI equal or over 30 kilograms or 27 kilograms along with risk factors for cardiovascular events like high cholesterol, diabetes, or controlled high blood pressure.

Missing a Dose

There will be instances that you may forget to take a dose. If this happens, take the missed dose as soon as possible. However, if it’s almost time for your next planned dose, then you can skip the missed dose. Make sure not to take another medicine just to make up the missed dose.


In an instant that you get overdosed, immediately seek medical assistance as an overdose of this drug can be dangerous and fatal to your health.

Things to Avoid

Taking this drug along with other stimulant medicines, which make you hyperactive or restless can worsen such effects. Ask your physician before taking it with diet pills and other drugs or stimulants to cure attention deficit hyperactivity disorder.

Tell your physician about every medicine you take, and those you begin or stop using throughout your treatment with this drug, precisely anti-depressants such as:

  • Sertraline
  • Paroxetine
  • Fluvoxamine
  • Fluoxetine
  • Escitalopram
  • Citalopram

Also, other medications may interrelate with this drug, including over-the-counter medicines, prescriptions, herbal products, and vitamins.

Response and Efficacy of the Drug

Peak concentrations of the drug are obtained within 3 to 4 hours. Research has shown that, averagely, this drug aids a lot of people at least 1 extra pound every week. Furthermore, the rate of weight loss is highest in the initial weeks of medication.

Undoubtedly, Phentermine may be utilized short-term as a tool for weight loss; nevertheless, this drug can be quite addictive, and tolerance may develop along with its weight-losing powers, rendering it’s less efficient with time.

But when accompanied by regular exercise, healthy eating habits, and lifestyle, it can make weight loss a more achievable goal. Make sure to take your usual dose every morning and add it to the lifestyle changes you’re learning to use, and weight loss issues can be a thing of the past.