Do not take Phentermine if you have used an MAO inhibitor such as isocarboxazid (Marplan), phenelzine (Nardil), rasagiline (Azilect), selegiline (Eldepryl, Emsam), or tranylcypromine (Parnate) within the past 14 days. Serious, life-threatening side effects can occur if you take 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 Phentermine with any other diet medications without your doctor’s advice.
Do not take this medication if you are allergic to Phentermine or other stimulants, or if you have:
• heart disease or high blood pressure;
• arteriosclerosis (hardening of the arteries);
• an overactive thyroid;
• glaucoma;
• if you are in an agitated state; or
• if you have a history of drug or alcohol abuse.