Does Phenytoin Interact With Ticagrelor?
Avoid use with strong inducers of CYP3A (e.g., rifampin, phenytoin, carbamazepine and phenobarbital) [see Clinical Pharmacology ( 12.3) ].
Severity: Major
Severity basis: drug interactions section (keywords: avoid). Combining Phenytoin (Anticonvulsant) and Ticagrelor (P2Y12 antiplatelet) is classified as a major interaction.
What to Do
The label advises avoiding this combination or using it only under close medical supervision. Talk to your prescriber or pharmacist before combining them.
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 Ticagrelor is a p2y12 antiplatelet; together they are documented as a major 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 Ticagrelor, 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
Avoid use with strong inducers of CYP3A (e.g., rifampin, phenytoin, carbamazepine and phenobarbital) [see Clinical Pharmacology ( 12.3) ].
Source: FDA structured product labeling (set_id 1225fd45-9b56-1671-ee77-cd0c9f2174a5).
Check these against your full medication list in our free Interaction Checker
Frequently Asked Questions
Can you take Phenytoin and Ticagrelor together?
Phenytoin and Ticagrelor have a documented major interaction. The label advises avoiding this combination or using it only under close medical supervision. Talk to your prescriber or pharmacist before combining them.
How serious is the Phenytoin and Ticagrelor interaction?
It is classified as a major interaction, based on the FDA label's drug interactions section (keywords: avoid). A major interaction can cause serious harm and often calls for a change in therapy or close monitoring.
What should I do if I'm taking both Phenytoin and Ticagrelor?
If you have been prescribed both Phenytoin and Ticagrelor, 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 + 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 + Trazodone(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 Ticagrelor Interactions
- Ticagrelor + Itraconazole(contraindicated)
- Ticagrelor + Carbamazepine(major)
- Ticagrelor + Clarithromycin(major)
- Ticagrelor + Ketoconazole(major)
- Ticagrelor + Rifampin(major)
- Ticagrelor + Dabigatran(moderate)
- Ticagrelor + Digoxin(moderate)
- Ticagrelor + Lovastatin(moderate)
- Ticagrelor + Morphine(moderate)
- Ticagrelor + Rosuvastatin(moderate)
- Ticagrelor + Simvastatin(moderate)