Drug General Information (ID: DDI0YDGFSH)
  Drug Name Conjugated estrogens (topical) Drug Info Thalidomide Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Estrogens Immunosuppressive Agents
  Structure

 Mechanism of Conjugated estrogens (topical)-Thalidomide Interaction (Severity Level: Major)
     Additive thrombogenic effects Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Conjugated estrogens (topical) Thalidomide
      Mechanism Thrombogenic effects Thrombogenic effects
      Key Mechanism Factor 1
Factor Name Thrombogenic effects
Factor Description Drug-induced thrombosis disrupts the balance between thrombogenic factors and protective mechanisms and tends to produce thrombosis. Drug-induced thrombosis usually causes venous thrombotic events, and arterial thrombotic events are also noted as a result of drug administration
      Mechanism Description
  • Additive thrombogenic effects by the combination of Conjugated estrogens (topical) and Thalidomide 

Recommended Action
      Management Agents that are known to cause thrombosis should be used with caution in multiple myeloma patients receiving thalidomide with standard chemotherapeutic agents and/or steroids. Patients should be advised to seek medical attention if they develop potential signs and symptoms of thromboembolism such as chest pain shortness of breath rapid pulse pain, swelling, and/or discoloration in an arm or leg and numbness or weakness on one side of the body. Prophylaxis with anticoagulants such as low-molecular weight heparins or warfarin may be appropriate, but the decision to take thromboprophylactic measures should be made after careful assessment of underlying risk factors. If a thromboembolic event occurs during therapy with thalidomide, treatment must be discontinued and standard anticoagulation therapy initiated. Once anticoagulation is stabilized and complications of the thromboembolic event under control, thalidomide may be restarted at the original dose if benefit is deemed to outweigh the risks. Anticoagulation therapy should be continued during the remaining course of thalidomide treatment.

References
1 Cerner Multum, Inc. "UK Summary of Product Characteristics.".
2 Product Information. Fareston (toremifene). Schering Laboratories, Kenilworth, NJ.
3 Product Information. Thalomid (thalidomide). Celgene Corporation, Warren, NJ.