What other drugs will affect phentermine?

Tell your doctor about all other medicines you use, especially:

• blood pressure medications;
  
• insulin or oral diabetes medication;
  
• guanethidine (Ismelin); or
  
• an antidepressant such as citalopram (Celexa), fluoxetine (Prozac, Sarafem, Symbyax), paroxetine (Paxil), sertraline (Zoloft), and others.
  

This list is not complete and other drugs may interact with phentermine. Tell your doctor about all medications you use. This includes prescription, over-the-counter, vitamin, and herbal products. Do not start a new medication without telling your doctor.