Fastin Interactions
There are 194 drugs known to interact with Fastin (phentermine), along with 13 disease interactions, and 3 alcohol/food interactions. Of the total drug interactions, 43 are major, 149 are moderate, and 2 are minor.
- View all 194 medications that may interact with Fastin
- View Fastin alcohol/food interactions (3)
- View Fastin disease interactions (13)
Most frequently checked interactions
View interaction reports for Fastin (phentermine) and the medicines listed below.
- Adderall (amphetamine / dextroamphetamine)
- Adderall XR (amphetamine / dextroamphetamine)
- albuterol
- alprazolam
- Ambien (zolpidem)
- aspirin
- atenolol
- atorvastatin
- Bactrim (sulfamethoxazole / trimethoprim)
- buspirone
- Chantix (varenicline)
- cyclobenzaprine
- Dilaudid (hydromorphone)
- Fioricet (acetaminophen / butalbital / caffeine)
- Flexeril (cyclobenzaprine)
- gabapentin
- ibuprofen
- Klonopin (clonazepam)
- levothyroxine
- Lexapro (escitalopram)
- lisinopril
- Lyrica (pregabalin)
- metformin
- Neurontin (gabapentin)
- Nexium (esomeprazole)
- Norco (acetaminophen / hydrocodone)
- omeprazole
- Prozac (fluoxetine)
- Topamax (topiramate)
- Xanax (alprazolam)
Fastin alcohol/food interactions
There are 3 alcohol/food interactions with Fastin (phentermine).
Fastin disease interactions
There are 13 disease interactions with Fastin (phentermine) which include:
- cardiovascular
- glaucoma
- agitation
- cardiac disease
- glaucoma
- hypertension
- psychiatric disorders
- pulmonary hypertension
- substance abuse
- renal dysfunction
- diabetics
- dialysis
- liver disease
More about Fastin (phentermine)
- Fastin consumer information
- Compare alternatives
- Reviews (81)
- Drug images
- Side effects
- Dosage information
- During pregnancy
- Drug class: anorexiants
- Breastfeeding
Related treatment guides
Drug Interaction Classification
Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit. | |
Moderately clinically significant. Usually avoid combinations; use it only under special circumstances. | |
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. | |
No interaction information available. |
Further information
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.