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Fastin (phentermine) Drug Interactions

A total of 520 drugs are known to interact with Fastin (phentermine).

  • 93 major drug interactions
  • 425 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 (ProAir HFA, Ventolin, Ventolin HFA, Proventil, Proventil HFA, ProAir RespiClick, Respirol, AccuNeb, Volmax, Airet, Vospire ER)
  • Ambien (zolpidem)
  • atenolol (Tenormin)
  • buspirone (BuSpar, Vanspar)
  • Chantix (varenicline)
  • gabapentin (Neurontin, Gralise, Gabarone, Fanatrex)
  • hydrochlorothiazide (HydroDIURIL, Microzide, Esidrix, Oretic, Diaqua, Aquazide H, Hydro Par, Ezide, Carozide, Loqua)
  • ibuprofen (Advil, Motrin, IBU, Proprinal, Advil Liqui-Gels, Motrin IB, IBU-200, Nuprin, Children's Motrin, Motrin Migraine Pain, Advil Migraine, Caldolor, Ibuprofen PMR, Advil Children's, Addaprin, NeoProfen, Advil Infant's Concentrated Drops, A-G Profen, Motrin Childrens, Childrens Ibuprofen Berry, Ibu-6, Ibu-8, Motrin Infant Drops, Ibu-Tab, Rufen, Genpril, Haltran, Menadol, Midol IB, Saleto-200, Q-Profen, Saleto-400, Saleto-600, Saleto-800, 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, 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, Levothyrox, Euthyrox, Levo-T, L Thyroxine Roche, Eutroxsig, Novothyrox, Oroxine, Tirosint-Sol, Levotabs, Levotec, Evotrox)
  • lisinopril (Zestril, Prinivil, Qbrelis)
  • metformin (Glucophage, Glumetza, Glucophage XR, Riomet, Fortamet)
  • Neurontin (gabapentin)
  • Nexium (esomeprazole)
  • omeprazole (Prilosec, Prilosec OTC, Zegerid (Original Formulation), Omesec)
  • phentermine (Adipex-P, Lomaira, Fastin, Suprenza, Ionamin, Teramine, Obenix, Atti-Plex P, Pro-Fast HS, Phentercot, Oby-Cap, Phentride, Obephen, Panshape M, Pro-Fast SR, T-Diet, 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

The classifications below are a general guideline only. It is difficult to determine the relevance of a particular drug interaction to any individual given the large number of variables.
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 information available.

Do not stop taking any medications without consulting your healthcare provider.

Further information

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

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