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Does Carmustine Interact with Phenytoin?

Carmustine and Phenytoin have a major drug interaction according to U.S. FDA drug labeling data. Carmustine may reduce phenytoin serum concentrations and efficacy. Consider alternative drugs to phenytoin. 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

What To Tell Your Doctor or Pharmacist

If you are taking Carmustine 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
💊 Carmustine(Gliadel)+💊 Phenytoin(Phenytoin Infatabs)

Severity & Interaction Details

⚠️
major
Use with caution — major interaction
Serious risk of clinically significant harm. Generally avoid; if used, monitor closely.
Severity scale
MinorContra
On record
Yes
Drug A class
—
Drug B class
Anti-epileptic Agent
Source
NLP:carmustine

What this means in plain English

Carmustine may reduce phenytoin serum concentrations and efficacy. Consider alternative drugs to phenytoin.

About Carmustine and Phenytoin

Phenytoin is an Anti-epileptic Agent. Carmustine is also sold under the brand name Gliadel. Carmustine is given by intravenous (IV) infusion, whereas Phenytoin is taken by mouth. Carmustine additionally carries an FDA boxed warning, the FDA's strongest safety alert.

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Data integrity: Every interaction shown is extracted directly from official U.S. FDA drug labeling via openFDA and the U.S. National Library of Medicine (NIH) — no interactions are invented, inferred, or manually edited. Maintained by CheckDrugInteractions.com. See our methodology or report a correction at support@checkdruginteractions.com.

Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine, supplemented with a small number of well-established interactions from curated clinical references. For informational purposes only. Always consult your pharmacist or physician.