Drug General Information (ID: DDIS0BRYC4)
  Drug Name Efavirenz Drug Info Fenofibrate Drug Info
  Drug Type Small molecule Small molecule
  Therapeutic Class Anti-Hiv Agents Antihyperammonia Agents
  Structure

 Mechanism of Efavirenz-Fenofibrate Interaction (Severity Level: Moderate)
     Increased risk of hepatotoxicity Click to Show/Hide Mechanism Graph
Could Not Find 2D Structure
      Drug Name Efavirenz Fenofibrate
      Mechanism Hepatotoxicity Hepatotoxicity
      Key Mechanism Factor 1
Factor Name Hepatotoxicity
Factor Description Combination of drugs that can induce hepatotoxicity may increase the risk of liver injury. Symptoms vary depending on the level of exposure and the total extent of liver damage, and may cause few symptoms if the damage is mild, and eventually lead to liver failure in patients with severe damage.
      Mechanism Description
  • Increased risk of hepatotoxicity by the combination of Efavirenz and Fenofibrate 

Recommended Action
      Management The risk of hepatic injury should be considered when efavirenz is used in combination with other agents that are potentially hepatotoxic (e.g., acetaminophen alcohol androgens and anabolic steroids antituberculous agents azole antifungal agents ACE inhibitors cyclosporine (high dosages) disulfiram endothelin receptor antagonists interferons ketolide and macrolide antibiotics kinase inhibitors minocycline nonsteroidal anti-inflammatory agents other HIV reverse transcriptase inhibitors proteasome inhibitors retinoids sulfonamides tamoxifen thiazolidinediones tolvaptan vincristine zileuton anticonvulsants such as carbamazepine, hydantoins, felbamate, and valproic acid lipid-lowering medications such as fenofibrate, lomitapide, mipomersen, niacin, and statins herbals and nutritional supplements such as black cohosh, chaparral, comfrey, DHEA, kava, pennyroyal oil, and red yeast rice). Patients should be advised to seek medical attention if they experience potential signs and symptoms of hepatotoxicity such as fever, rash, itching, anorexia, nausea, vomiting, fatigue, malaise, right upper quadrant pain, dark urine, pale stools, and jaundice. Monitoring of liver function tests should occur before and during treatment, especially in patients with underlying hepatic disease (including hepatitis B or C coinfection) or marked transaminase elevations.

References
1 Elsharkawy AM, Schwab U, McCarron B, et al. "Efavirenz induced acute liver failure requiring liver transplantation in a slow drug metaboliser." J Clin Virol 58 (2013): 331-3. [PMID: 23763943]
2 Product Information. Sustiva (efavirenz). DuPont Pharmaceuticals, Wilmington, DE.