Ivermectin, fenbendazole, and pyrantel pamoate are all used to treat animals for:

• A. Chronic diarrhea
• B. Viral infections
• C. Endoparasites
• D. Inflammation

Answer: (C)

These medicines are anti-parasitic drugs used to eliminate internal parasites in animals. Endoparasites are organisms that live inside the host, such as intestinal worms. Ivermectin, fenbendazole, and pyrantel pamoate each target these internal parasites, though they belong to different drug classes with different actions. Ivermectin disrupts nerve signals in many nematodes, leading to paralysis and death. Fenbendazole interferes with parasite microtubule function, broadening its activity against GI nematodes. Pyrantel pamoate acts as a neuromuscular blocker, causing the worms to be expelled from the intestines. While treating parasites can help resolve related symptoms like diarrhea, these drugs themselves are not used to treat viral infections or inflammatory conditions directly.