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What is Phentermine?

Phentermine is a stimulant similar to amphetamines. It helps stimulate the central nervous system (nerves and brain), raising heart rate and blood pressure while decreasing appetite. This medication is an appetite suppressant that belongs to the sympathomimetic amines class of drugs.

Phentermine helps treat obesity together with diet and exercise, particularly in people with risk factors such as high cholesterol or high blood pressure. You can order phentermine online with a prescription.

Important Information

  • Never use phentermine if you are pregnant or breastfeeding a baby.
  • Do not take phentermine if you have an overactive thyroid, severe heart problems, glaucoma, advanced coronary artery disease,  uncontrolled high blood pressure, extreme agitation, or a history of drug abuse.
  • If you have used MAO inhibitors in the last 14 days, such as linezolid, methylene blue injection, isocarboxazid, phenelzine, rasagiline, selegiline, or tranylcypromine, do not take this medication. A dangerous drug interaction may occur.
  • If you think the medicine does not work or if you do not lose a minimum of 4 pounds in 4 weeks, call your doctor immediately.

What to know before taking phentermine?

Do not use phentermine if you are allergic to it or if you have:

  • A history of heart diseases such as stroke, heart rhythm problems, coronary artery disease, congestive heart failure
  • Overactive thyroid
  • A history of drug abuse
  • Extreme agitation or nervousness
  • Severe or uncontrolled high blood pressure
  • Glaucoma
  • If you take other diet pills

If you have used MAO inhibitors in the last 14 days, such as linezolid, methylene blue injection, isocarboxazid, phenelzine, rasagiline, selegiline, or tranylcypromine, do not take this medication. A dangerous drug interaction may occur.

Weight loss during pregnancy can harm your unborn baby, even if you are overweight. If you are pregnant, do not use phentermine. If you get pregnant during treatment, tell your doctor immediately. 

Do not breastfeed while using this medicine. Phentermine may pass into breast milk and have undesirable effects on a nursing infant. 

To ensure that phentermine is safe for you, tell your doctor if you have:

  • High blood pressure
  • Diabetes (your diabetes drug dosage may need to be adjusted)
  • Coronary artery disease or heart disease
  • Kidney disease
  • A heart valve disorder

Phentermine is not for use by anyone younger than 16 years old.

How to take phentermine?

  • Take phentermine as prescribed by your doctor. Follow all directions and read all the instructions on your prescription label. Your doctor may change your dose from time to time. You can buy phentermine online from a trusted online pharmacy.
  • The dosage and length of treatment depend upon your medical condition and response to treatment. Take doses before breakfast or 1 to 2 hours after breakfast. Follow your doctor’s dosing instructions very carefully. Taking phentermine late in the day can cause difficulty sleeping or insomnia.
  • Do not use phentermine in larger amounts or for longer than prescribed. Taking phentermine in high amounts will not make it more effective and can cause serious, life-threatening side effects.
  • You should use this medicine for the short term. After a couple of weeks, appetite suppression effects may wear out.
  • Phentermine may be habit-forming. Misuse may cause addiction, overdose, or death. Selling or distribution of this medicine is against the law.
  • If you think the medicine does not work as well, or if you have not lost a minimum of 4 pounds in 4 weeks, call your doctor immediately.
  • Phentermine dosage

Usual Adult Dose for Obesity

Take 8 mg orally three times a day, 30 minutes before meals.

Take 15 to 37.5 mg orally once a day, before breakfast, or 1 to 2 hours after breakfast.

Overdose

A phentermine overdose can be fatal.

Overdose symptoms include confusion, panic, hallucinations, extreme restlessness, nausea, vomiting, diarrhea, stomach cramps, feeling tired or depressed, irregular heartbeats, a weak pulse, seizures, or slow breathing (breathing may stop).

What to avoid while using phentermine?

Do not drive or engage in risky activities until you understand how phentermine will affect you. 

Do not drink alcohol while taking this medication, as it may result in side effects. Drinking alcohol while taking phentermine may increase the risk of side effects and impair your judgment even more.

Phentermine side effects

Common phentermine side effects may include:

  • Itching
  • Dry mouth, unpleasant taste
  • Dizziness, headache
  • Diarrhea, constipation, stomach pain
  • Increased or decreased interest in sex

Serious side effects

  • Pain in your chest, feeling like you might pass out, 
  • Swelling in your feet or ankles 
  • Shortness of breath, even with mild exertion
  • Unusual changes in mood or behavior
  • Fluttering in your chest or pounding heartbeats
  • Feeling restless, tremors, trouble to sleep
  • Increased blood pressure, symptoms may include blurred vision, pounding in your ears or neck, severe headache, anxiety, nosebleed

Other phentermine side effects include blurred vision, chills, high blood pressure, hair loss, muscle pain, a fast heart rate, and difficulty urinating.

This drug may cause an increase in blood pressure.  Therefore, you should check your blood pressure regularly while using this drug.

What drugs can interact with phentermine?

  • If you are currently taking or have used other appetite-suppressant medications (e.g., diethylpropion, ephedra/ma huang) recently, inform your doctor or pharmacist before starting this medication.
  • Dexfenfluramine (Redux) can cause pulmonary hypertension, a rare fatal lung disorder. Without consulting your doctor, do not combine phentermine with any other diet medications.
  • Many medicines can interact with phentermine. Prescription and over-the-counter medications, vitamins, and herbal products are all included. 
  • Combining MAO inhibitors with phentermine may result in a dangerous drug interaction. Some examples of MAO inhibitors include isocarboxazid, linezolid, methylene blue, phenelzine, procarbazine, rasagiline, safinamide, selegiline, and tranylcypromine.