Fenbendazole + Ivermectin Interaction

⚠️ RESEARCH-BASED INTERACTION DATA — NOT COMPREHENSIVE.

Interaction Type: caution | Evidence Level: preliminary

Both antiparasitic drugs are studied for cancer repurposing but target different mechanisms. Combining them lacks clinical evidence and may increase hepatotoxicity risk.

Mechanism of Interaction

Fenbendazole disrupts microtubules (tubulin binding) and inhibits glucose uptake (GLUT4). Ivermectin modulates chloride channels, inhibits PAK1/Wnt signaling, and reverses P-glycoprotein-mediated multidrug resistance. While mechanisms are distinct (structural vs. signaling), both are hepatically metabolized. P-glycoprotein modulation by ivermectin could alter fenbendazole distribution.

Clinical Relevance

Some patient communities combine these drugs. No clinical trials support this combination. Both have individual preclinical anti-cancer data. Risk-benefit is unclear without controlled studies. Ivermectin has more human safety data than fenbendazole.

Recommendations

• Monitor liver function tests closely if combining
• Do not combine without oncologist supervision
• Consider alternating rather than concurrent dosing
• Ivermectin's P-gp modulation may alter fenbendazole pharmacokinetics

Relevant Conditions

• Cancer (drug repurposing research)