Before taking phentermine

Do not use phentermine if you have taken an MAO inhibitor such as furazolidone (Furoxone), isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate) in the last 14 days. Serious, life threatening side effects can occur if you use phentermine before the MAO inhibitor has cleared from your body.
Taking phentermine together with other diet medications such as fenfluramine (Phen-Fen) or dexfenfluramine (Redux) can cause a rare fatal lung disorder called pulmonary hypertension. Do not take tbis medicine with any other diet medications without your doctor's advice.
You should not take phentermine if you are allergic to it, or if you have:

• coronary artery disease (hardening of the arteries);
  
• heart disease;
  
• severe or uncontrolled high blood pressure;
  
• overactive thyroid;
  
• glaucoma;
  
• if you have a history of drug or alcohol abuse; o
  
• if you are allergic to other diet pills, amphetamines, stimulants, or cold medications.
  

If you have any of these other conditions, you may need a phentermine dose adjustment or special tests:

• high blood pressure;
  
• diabetes; or
  
• a thyroid disorder.
  

FDA pregnancy category C. It is not known whether phentermine will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication. Phentermine can pass into breast milk and may harm a nursing baby. You should not breast-feed while taking phentermine. Do not give this medication to a child younger than 16 years old.


Phentermine may be habit-forming and should be used only by the person it was prescribed for. Never share this medicine with another person, especially someone with a history of drug abuse or addiction. Keep the medication in a place where others cannot get to it.