It’s always important to tell your doctor and pharmacist about all of your treatments, including over-the-counter (OTC) medications; vitamins, nutritional shakes, protein powders, and other supplements; herbal treatments or other alternative medicines; and any illegal or recreational drugs.

The following drugs interact with phentermine:

  • Isoproterenol
  • Dopamine
  • Ephedrine
  • Epinephrine
  • Norepinephrine (Levophed)
  • Linezolid (Zyvox)
  • Phenylephrine injection
  • Venlafaxine (Effexor, Effexor XR)
  • Amphetamine (Adderall)
  • Benzphetamine (Didrex, Regimex)
  • Dexmethylphenidate (Focalin XR, Focalin)

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