Which drug is commonly used to treat endoparasites?

• A. Miconazole
• B. Amitraz
• C. Ivermectin
• D. Penicillin

Answer: (C)

Treating internal parasites requires a systemic agent that acts on parasites living inside the animal. Ivermectin is a broad‑spectrum anthelmintic commonly used to eliminate endoparasites such as gastrointestinal nematodes and other internal parasites. It works by affecting the parasite’s nervous system, causing paralysis and death, while being suitable for many host species at appropriate doses. The other drugs target different things: miconazole is an antifungal used for fungal infections, amitraz is used against external parasites like mites and ticks, and penicillin targets bacteria. Because it specifically treats internal parasites, ivermectin is the best choice.