Some over-the-counter (OTC) and prescription medications are safe to take alongside phentermine, but others must be avoided to prevent dangerous interactions.
Always ask your doctor or pharmacist before combining any medication or supplement with phentermine.
Never combine these medications with phentermine:
- Caffeine pills
- Medicine for asthma/breathing problems
- Medicine for cold, sinus problems or allergies
- Antidepressants (unless explicitly instructed to do so by the same doctor that prescribed phentermine)
- Any other diet pills/supplements
This is NOT a complete list, so it is critical that you check with a medical professional before adding any new medication or supplement to your routine.
→ Read more about phentermine contraindications.