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Phentermine Warning!

Do not take phentermine in the event that you have used an MAO inhibitor, for example isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate), within the previous 14 days. Critical, life-threatening side effects can occur if you take phentermine before the MAO inhibitor is removed from your body.

Do not take phentermine along with any other diet drugs without your doctor’s advice. Using phentermine along with some other diet drugs, like fenfluramine (Phen-Fen) or dexfenfluramine (Redux), may cause an uncommon fatal lung problem called pulmonary hypertension.

Do not take this drug if you are allergic to phentermine or other stimulants, or if you have:

  • Heart disease or high blood pressure;
  • Arteriosclerosis (hardening of the arteries);
  • Overactive thyroid;
  • Glaucoma;
  • If you are in an agitated condition
  • If you have a background of drug or alcohol abuse.


Before taking phentermine, inform your personal doctor if you are allergic to any kind of drugs, or if you have:

  • Thyroid disorder;
  • Anxiety disorder;
  • Diabetes; or
  • Epilepsy or other seizure disorders.

If you have any of these problems, you would need a dose adjustment or special assessments during treatment.


Do not take phentermine without informing your doctor if you are pregnant. It is not identified whether or not phentermine will harm an unborn baby.

Do not take phentermine without having informing your doctor if you are breastfeeding a baby. It is also not known whether or not phentermine passes into breast milk, or if it may harm a nursing baby.

Do not provide this medication to any person younger than 16 years of age without the guidance of a doctor. Phentermine may be habit-forming and needs to be used only by someone that it was absolutely recommended for.

Phentermine should not be shared with someone else, especially a person that has a history of medication abuse or addiction.

Keep your medicine in a safe location wher other people cannot get to it.


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  1. February 27, 2012

    Hello, thank you for asking. For your concern about your medication, please visit and talk to your doctor before taking Phentermine with any prescriptions. Phentermine is also a prescription drug, so visit your doctor is the best way to go.

  2. February 24, 2012

    Is it safe to take phentermine if you are taking antiviral medication


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