Merck Manual

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Professional Version

Parasite Control During Pregnancy in Horses

By

Patricia L. Sertich

, MS, VMD, DACT, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania

Last full review/revision Feb 2021 | Content last modified Mar 2021

Most anthelmintics are safe for use throughout pregnancy, but precautions and contraindications on package inserts should be heeded. In general, anthelmintics Anthelmintics should not be administered to mares during the first 60 days of gestation (organogenesis). Parasite control programs should be tailored to meet the particular farm needs. Also see Gastrointestinal Parasites of Horses Gastrointestinal Parasites of Horses . Pregnant mares should be administered ivermectin or a benzimidazole 1–3 days before foaling to prevent lactogenic transmission of Strongyloides westeri, which can cause diarrhea in young foals.

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