Drug General Information (ID: DDIVEFIP86)
  Drug Name Phenytoin Drug Info Salicylic acid (sodium) Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Anticonvulsants Antiinflammatory Agents
  Structure

 Mechanism of Phenytoin-Salicylic acid (sodium) Interaction (Severity Level: Minor)
     Competitive binding of plasma proteins Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Phenytoin Salicylic acid (sodium)
      Mechanism Competition for plasma protein binding sites Competition for plasma protein binding sites
      Key Mechanism Factor 1
Factor Name Plasma protein binding
Factor Description Plasma protein binding refers to the degree of binding of a drug to proteins in the blood, and the lower the degree of binding, the more efficiently the drug can cross cell membranes or diffuse. Plasma protein binding alters the distribution and therapeutic characteristics of the drugs.
      Mechanism Description
  • Increased plasma concentration of Salicylic acid (sodium) and Phenytoin due to competitive binding of plasma proteins

References
1 Fraser DG, Ludden TM, Evens RP, Sutherland EW "Displacement of phenytoin from plasma binding sites by salicylate." Clin Pharmacol Ther 27 (1980): 165-9. [PMID: 7353334]
2 Leonard RF, Knott PJ, Rankin GO, et al "Phenytoin-salicylate interaction." Clin Pharmacol Ther 29 (1981): 56-60. [PMID: 7460475]
3 Neuvonen PJ, Lehtovaara R, Bardy A, Elomaa E "Antipyretic analgesics in patients on antiepileptic drug therapy." Eur J Clin Pharmacol 15 (1979): 263-8. [PMID: 314381]