Does Promethazine Phenylephrine Codeine Interact with Phenytoin?
Promethazine Phenylephrine Codeine and Phenytoin have a major drug interaction according to U.S. FDA drug labeling data. CYP3A4 inducer can result in lower codeine and morphine levels, causing decreased efficacy or withdrawal syndrome. The mechanism involves cyp3a4 induction reducing codeine metabolism to morphine. 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
- Major
- Phenytoin Class
- Anti-epileptic Agent
- Management
- Close medical supervision required
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Promethazine Phenylephrine Codeine and Phenytoin occurs because cyp3a4 induction reducing codeine metabolism to morphine. Clinically, this means cyp3a4 inducer can result in lower codeine and morphine levels, causing decreased efficacy or withdrawal syndrome. This is classified as a major interaction, meaning it could cause serious harm if not properly managed. Your healthcare provider may need to adjust dosages, substitute one medication, or increase monitoring frequency.
What To Tell Your Doctor or Pharmacist
If you are taking Promethazine Phenylephrine Codeine 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 how frequently you should be monitored while these are co-prescribed
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider