Does Acetaminophen Caffeine Dihydrocodeine Bitartrate Interact with Phenytoin?
Acetaminophen Caffeine Dihydrocodeine Bitartrate and Phenytoin have a moderate drug interaction according to U.S. FDA drug labeling data. Induces hepatic microsomal enzymes, increasing potential for acetaminophen hepatotoxicity. The mechanism involves enhanced hepatic metabolism of acetaminophen. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Moderate
- Acetaminophen Caffeine Dihydrocodeine Bitartrate Class
- Central Nervous System Stimulant
- Phenytoin Class
- Anti-epileptic Agent
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Acetaminophen Caffeine Dihydrocodeine Bitartrate and Phenytoin occurs because enhanced hepatic metabolism of acetaminophen. Clinically, this means induces hepatic microsomal enzymes, increasing potential for acetaminophen hepatotoxicity. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.
What To Tell Your Doctor or Pharmacist
If you are taking Acetaminophen Caffeine Dihydrocodeine Bitartrate and your doctor is considering prescribing Phenytoin (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider