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EXZOLT CATTLE-CA1 Wins FDA Conditional Approval, Expanding Options to Prevent and Treat New World Screwworm in Cattle

Submitted by fairsonline_team on
FDA Conditionally Approves Merck Animal Health’s EXZOLT CATTLE-CA1 to Address New World Screwworm Risk in U.S. Beef and Heifer Herds

SHERIDAN, WYOMING - December 19, 2025 - Merck Animal Health says the U.S. Food and Drug Administration (FDA) has granted conditional approval for EXZOLT™ CATTLE-CA1 (fluralaner topical solution), positioning the pour-on as a new systemic parasiticide option for U.S. beef operations and replacement dairy heifers facing New World screwworm (Cochliomyia hominivorax) larvae (myiasis) risk and cattle fever tick (Rhipicephalus microplus) pressure.