Sequential interaction of phenytoin and phenobarbital with fluorouracil

Aiko Tsuda, Akiko Miki, Takeshi Togawa, Hiroki Satoh, Satoko Hori, Yasufumi Sawada

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Objective: We report a case of sequential interaction of phenytoin (PHT) and phenobarbital (PB) with fluorouracil (5-FU). Case report: A male patient aged 60 under treatment with PHT and PB in which serum concentrations of PHT (32.8 μg/ml) and PB (26.7 μg/ml) increased ∼2-fold after the start of postoperative adjuvant therapy with calcium levofolinate (l-LV) and fluorouracil (5-FU). When the drug interactions of this case evaluated using the Drug Interaction Probability Scale, was assessed as "probable". Discussion: In this case, 5-FU increased PHT, which in turn may have increased the PB concentration, suggesting that when fluoropyrimidine antitumor agents are administered to patients receiving PHT in combination with other drugs, some measures should be taken in consideration of secondary effects of antitumor agents on other drugs that may possibly interact with PHT, including frequent monitoring of blood drug concentration.

Original languageEnglish
Pages (from-to)862-866
Number of pages5
JournalInternational Journal of Clinical Pharmacology and Therapeutics
Issue number12
Publication statusPublished - 2012 Dec 1
Externally publishedYes


  • Adverse event
  • Drug interaction
  • Fluorouracil
  • Phenobarbital
  • Phenytoin

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)


Dive into the research topics of 'Sequential interaction of phenytoin and phenobarbital with fluorouracil'. Together they form a unique fingerprint.

Cite this