Does Phenytoin Interact with Phenobarbital Sodium?
Phenytoin and Phenobarbital Sodium have a moderate drug interaction according to U.S. FDA drug labeling data. The effect of barbiturates on phenytoin metabolism is variable and unpredictable. Blood levels of both drugs should be monitored more frequently if given concurrently. The mechanism involves variable effect on metabolism. 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
- Phenytoin Class
- Anti-epileptic Agent
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Phenytoin and Phenobarbital Sodium occurs because variable effect on metabolism. Clinically, this means the effect of barbiturates on phenytoin metabolism is variable and unpredictable. blood levels of both drugs should be monitored more frequently if given concurrently. 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 Phenytoin and your doctor is considering prescribing Phenobarbital Sodium (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