Drug General Information (ID: DDIX0ZULED)
  Drug Name Dicoumarol Drug Info Tolbutamide Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Anticoagulants Antidiabetic Agents
  Structure

 Mechanism of Dicoumarol-Tolbutamide Interaction (Severity Level: Moderate)
     Competitive binding of plasma proteins Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Dicoumarol Tolbutamide
      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 Tolbutamide and Dicoumarol due to competitive binding of plasma proteins

Recommended Action
      Management The patient should be monitored for altered anticoagulation (PT/INR) and altered glycemic effect when either of these drugs is added to or removed from a patient's regimen. Patients should be advised to regularly monitor their blood sugar, counseled on how to recognize and treat hypoglycemia (e.g., headache, dizziness, drowsiness, nausea, tremor, hunger, weakness, or palpitations), and to promptly report any signs of bleeding (pain, swelling, headache, dizziness, weakness, prolonged bleeding from cuts, vaginal bleeding, nosebleeds, bleeding of gums from brushing, red or brown urine, or red or black stools) to their physician.

References
1 Hansen JM, Christensen LK "Drug interactions with oral sulphonylurea hypoglycaemic drugs." Drugs 13 (1977): 24-34. [PMID: 401727]
2 Jahnchen E, Meinertz T, Gilfrich HJ, Groth U "Pharmacokinetic analysis of the interaction between dicoumarola and tolbutamide in man." Eur J Clin Pharmacol 10 (1976): 349-56. [PMID: 61862]
3 Product Information. Diabeta (glyburide). Hoechst Marion-Roussel Inc, Kansas City, MO.