In the U.S., name‑brand and generic dewormers fall into four anthelmintic drug classes: avermectins (macrocyclic lactones), benzimidazoles, imidazothiazoles and sulfonamide derivatives, each with its own distinct molecular structure that harms parasites in different ways.
Sandy Stuttgen, DVM, reviews the drug classes, their activity against parasites, potential resistance and the importance of fecal egg count testing before and after dewormer use.
Source: Wisconsin Agriculturist, January 29, 2026. Link.
Strategic fecal egg counts and fecal egg count reduction tests are the only way to know if a product is doing its job.”
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