Drug General Information (ID: DDI1MLKIP2)
  Drug Name Phenytoin Drug Info Tolazamide Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Anticonvulsants Antidiabetic Agents
  Structure

 Mechanism of Phenytoin-Tolazamide Interaction (Severity Level: Moderate)
     Antagonize the effect of antidiabetic agents Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Phenytoin Tolazamide
      Mechanism 1 Hyperglycemia Antidiabetic agent
      Key Mechanism Factor 1
Factor Name Antidiabetic agents
Factor Description The hypoglycemic effect of antidiabetes may be reduced, leading to higher blood glucose, increased blood glucose fluctuations, and the possibility of hyperglycemic complications
      Mechanism Description
  • Antagonize the effect of Tolazamide when combined with Phenytoin 
      Mechanism 2 Hyperglycemic effects Antidiabetic agent
      Key Mechanism Factor 2
Factor Name Antidiabetic agents
Factor Description The hypoglycemic effect of antidiabetes may be reduced, leading to higher blood glucose, increased blood glucose fluctuations, and the possibility of hyperglycemic complications
      Mechanism Description
  • Antagonize the effect of Tolazamide when combined with Phenytoin 

Recommended Action
      Management Consideration should be given to more closely monitoring blood glucose and phenytoin levels during coadministration with sulfonylureas. Patients should be advised to notify their physician if loss of glycemic control occurs or if they experience symptoms of possible phenytoin toxicity, including drowsiness, visual disturbances, change in mental status, seizures, nausea, and ataxia.

References
1 Malherbe C, Burrill KC, Levin SR, Karam JH, Forsham PH "Effect of diphenylhydantoin on insulin secretion in man." N Engl J Med 286 (1972): 339-42. [PMID: 5008555]
2 Stambaugh JE, Tucker DC "Effect of diphenylhydantoin on glucose tolerance in patients with hypoglycemia." Diabetes 23 (1974): 679-83. [PMID: 4851631]
3 Tassaneeyakul W, Veronese ME, Birkett VDJ, et al. "Co-regulation of phenytoin and tolbutamide metabolism in humans." Br J Clin Pharmacol 34 (1992): 494-8