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Fastin (phentermine) Drug Interactions

A total of 521 drugs are known to interact with Fastin (phentermine).

  • 93 major drug interactions
  • 426 moderate drug interactions
  • 2 minor drug interactions

Show all medications in the database that may interact with Fastin (phentermine).

Check for interactions with Fastin (phentermine)

Type in a drug name and select a drug from the list.

Common medications checked in combination with Fastin (phentermine)

  • Adderall XR (amphetamine / dextroamphetamine)
  • albuterol (Ventolin, ProAir HFA, Ventolin HFA, Proventil, Proventil HFA, ProAir RespiClick, AccuNeb, Respirol, Vospire ER, Volmax, Airet, ProAir Digihaler)
  • Ambien (zolpidem)
  • atenolol (Tenormin)
  • buspirone (BuSpar, Vanspar)
  • Chantix (varenicline)
  • gabapentin (Neurontin, Gralise, Gabarone, Fanatrex)
  • hydrochlorothiazide (HydroDIURIL, Microzide, Oretic, Esidrix, Ezide, Hydro Par, Carozide, Diaqua, Loqua, Aquazide H)
  • ibuprofen (Advil, Motrin, IBU, Children's Motrin, Advil Liqui-Gels, Proprinal, IBU-200, Motrin IB, Advil Migraine, Ibu-8, Motrin Childrens, Caldolor, Ibuprofen PMR, Nuprin, Childrens Ibuprofen Berry, Motrin Migraine Pain, Addaprin, NeoProfen, Advil Infant's Concentrated Drops, Ibu-Tab, Rufen, Genpril, Motrin Infant Drops, Haltran, Menadol, Midol IB, Saleto-200, Q-Profen, Saleto-400, Saleto-600, Saleto-800, A-G Profen, Advil Children's, Advil Junior Strength, Midol Maximum Strength Cramp Formula, Actiprofen, PediaCare Infants' IB Ibuprofen Pain Reliever/Fever Reducer, Ibu-4, PediaCare Children's IB Ibuprofen Pain Reliever/Fever Reducer, Ibu-6, Motrin Junior Strength, Help I Have An Aching Body, Children's ElixSure IB, Cap-Profen, Motrin Pediatric, Advil Film-Coated)
  • Klonopin (clonazepam)
  • Lasix (furosemide)
  • levothyroxine (Synthroid, Levoxyl, Tirosint, Levothroid, Eltroxin, Unithroid, Euthyrox, Levothyrox, Eutroxsig, Oroxine, Levo-T, Levotabs, L Thyroxine Roche, Novothyrox, Tirosint-Sol, Levotec, Evotrox)
  • lisinopril (Zestril, Prinivil, Qbrelis)
  • metformin (Glucophage, Glumetza, Glucophage XR, Fortamet, Riomet)
  • Neurontin (gabapentin)
  • Nexium (esomeprazole)
  • omeprazole (Prilosec, Prilosec OTC, Zegerid (Original Formulation), Omesec)
  • phentermine (Adipex-P, Lomaira, Fastin, Suprenza, Ionamin, T-Diet, Oby-Cap, Teramine, Obenix, Atti-Plex P, Pro-Fast HS, Phentercot, Phentride, Obephen, Panshape M, Pro-Fast SR, Zantryl, Oby-Trim, Pro-Fast SA, Teramine ER)
  • Prozac (fluoxetine)
  • Topamax (topiramate)
  • Wellbutrin (bupropion)
  • Xanax (alprazolam)

Fastin (phentermine) alcohol/food interactions

There are 3 alcohol/food interactions with Fastin (phentermine)

Fastin (phentermine) disease interactions

There are 15 disease interactions with Fastin (phentermine) which include:

Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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