Does Phenytoin Interact With Trazodone?
Digoxin or Phenytoin: Monitor for increased digoxin or phenytoin serum levels ( 7 ).
Severity: Moderate
Severity basis: drug interactions section (keywords: monitor). Combining Phenytoin (Anticonvulsant) and Trazodone (Serotonin antagonist/reuptake inhibitor) is classified as a moderate interaction.
What to Do
Use this combination with caution. Your prescriber may monitor you more closely or adjust doses.
How This Interaction Works
Interactions like this one can happen when two medicines have overlapping effects, or when one changes how the other is absorbed, broken down, or cleared from the body. Phenytoin is a anticonvulsant and Trazodone is a serotonin antagonist/reuptake inhibitor; together they are documented as a moderate interaction. How much this matters depends on your dose, your other medications, and your overall health.
If You Take Both Medications
If you have been prescribed both Phenytoin and Trazodone, do not start, stop, or change either medication on your own — some medicines are unsafe to stop suddenly. Tell your prescriber and pharmacist that you take both so they can decide whether the combination is right for you, adjust the dose, monitor you more closely, or suggest an alternative.
From the FDA Label
Digoxin or Phenytoin: Monitor for increased digoxin or phenytoin serum levels ( 7 ).
Source: FDA structured product labeling (set_id 007f38e0-653b-43e4-a1c1-b59997b2762a).
Trazodone
Serotonin antagonist/reuptake inhibitor
Brands: Desyrel, Oleptro
View Trazodone safety profileCheck these against your full medication list in our free Interaction Checker
Frequently Asked Questions
Can you take Phenytoin and Trazodone together?
Phenytoin and Trazodone have a documented moderate interaction. Use this combination with caution. Your prescriber may monitor you more closely or adjust doses.
How serious is the Phenytoin and Trazodone interaction?
It is classified as a moderate interaction, based on the FDA label's drug interactions section (keywords: monitor). A moderate interaction can be clinically meaningful and usually calls for monitoring or a dose adjustment.
What should I do if I'm taking both Phenytoin and Trazodone?
If you have been prescribed both Phenytoin and Trazodone, do not start, stop, or change either medication on your own — some medicines are unsafe to stop suddenly. Tell your prescriber and pharmacist that you take both so they can decide whether the combination is right for you, adjust the dose, monitor you more closely, or suggest an alternative.
This information is educational — not medical advice.
This page is provided for general educational purposes and summarizes publicly available data from sources such as the U.S. Food & Drug Administration. It is not a substitute for the judgment of a licensed clinician and should not be used to start, stop, or change any medication. It may be incomplete or out of date, and individual circumstances vary. Always talk with your prescriber or pharmacist about your specific medications and health conditions. If you think you may have a medical emergency, call 911.
Other Phenytoin Interactions
- Phenytoin + Apixaban(major)
- Phenytoin + Itraconazole(major)
- Phenytoin + Methotrexate(major)
- Phenytoin + Rifampin(major)
- Phenytoin + Rivaroxaban(major)
- Phenytoin + Ticagrelor(major)
- Phenytoin + Amiodarone(moderate)
- Phenytoin + Atorvastatin(moderate)
- Phenytoin + Carbamazepine(moderate)
- Phenytoin + Carbidopa Levodopa(moderate)
- Phenytoin + Cholecalciferol(moderate)
- Phenytoin + Clarithromycin(moderate)
- Phenytoin + Cyclosporine(moderate)
- Phenytoin + Diazepam(moderate)
- Phenytoin + Digoxin(moderate)
- Phenytoin + Doxycycline(moderate)
- Phenytoin + Fluconazole(moderate)
- Phenytoin + Fluoxetine(moderate)
- Phenytoin + Folic Acid(moderate)
- Phenytoin + Furosemide(moderate)
- Phenytoin + Glimepiride(moderate)
- Phenytoin + Hydrocodone Acetaminophen(moderate)
- Phenytoin + Ketoconazole(moderate)
- Phenytoin + Lamotrigine(moderate)
- Phenytoin + Lithium(moderate)
- Phenytoin + Methylphenidate(moderate)
- Phenytoin + Methylprednisolone(moderate)
- Phenytoin + Mirtazapine(moderate)
- Phenytoin + Nifedipine(moderate)
- Phenytoin + Omeprazole(moderate)
- Phenytoin + Oxycodone(moderate)
- Phenytoin + Paroxetine(moderate)
- Phenytoin + Quetiapine(moderate)
- Phenytoin + Sertraline(moderate)
- Phenytoin + Simvastatin(moderate)
- Phenytoin + Tacrolimus(moderate)
- Phenytoin + Topiramate(moderate)
- Phenytoin + Tramadol(moderate)
- Phenytoin + Sulfamethoxazole Trimethoprim(moderate)
- Phenytoin + Verapamil(moderate)
- Phenytoin + Warfarin(moderate)
- Phenytoin + Alprazolam(minor)
- Phenytoin + Atomoxetine(minor)
- Phenytoin + Azithromycin(minor)
- Phenytoin + Buprenorphine Naloxone(minor)
- Phenytoin + Bupropion(minor)
- Phenytoin + Canagliflozin(minor)
- Phenytoin + Clonazepam(minor)
- Phenytoin + Codeine(minor)
- Phenytoin + Dexamethasone(minor)
- Phenytoin + Gabapentin(minor)
- Phenytoin + Glipizide(minor)
- Phenytoin + Levothyroxine(minor)
- Phenytoin + Liothyronine(minor)
- Phenytoin + Metformin(minor)
- Phenytoin + Metronidazole(minor)
- Phenytoin + Modafinil(minor)
- Phenytoin + Ondansetron(minor)
- Phenytoin + Pregabalin(minor)
- Phenytoin + Sucralfate(minor)
- Phenytoin + Tadalafil(minor)
- Phenytoin + Valproic Acid(minor)
Other Trazodone Interactions
- Trazodone + Amiodarone(major)
- Trazodone + Clarithromycin(major)
- Trazodone + Itraconazole(major)
- Trazodone + Aspirin(moderate)
- Trazodone + Digoxin(moderate)
- Trazodone + Warfarin(moderate)
- Trazodone + Buprenorphine Naloxone(minor)
- Trazodone + Buspirone(minor)
- Trazodone + Carbamazepine(minor)
- Trazodone + Clopidogrel(minor)
- Trazodone + Codeine(minor)
- Trazodone + Dabigatran(minor)
- Trazodone + Ketoconazole(minor)
- Trazodone + Lithium(minor)
- Trazodone + Morphine(minor)
- Trazodone + Oxycodone(minor)
- Trazodone + Rifampin(minor)
- Trazodone + Rivaroxaban(minor)
- Trazodone + Tramadol(minor)