What Is Phentermine?

Potential Medication Interactions

Phentermine could cause a potentially fatal lung disease known as pulmonary hypertension if it is taken in conjunction with other weight loss medicines, including other prescriptions, over-the-counter medicines, and herbal supplements designed as weight loss aids. Some of the most popular diet medications known to interact with phentermine are fenfluramine and dexfenfluramine. To prevent these interactions, patients should not take any other diet medications while taking phentermine, and they should let their physician know about all the medications they use. Phentermine interacts with more than 150 drugs and is associated with forty-two potentially serious drug interactions. The medication has particularly strong drug interactions with antidepressants such as fluoxetine, duloxetine, venlafaxine, and escitalopram. It is also known to interact with metformin, levothyroxine, and liraglutide. After having their doctor check their current medication list for possible issues before prescribing phentermine, patients should ask their pharmacist to check for potential drug interactions before the medicine is dispensed.