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Find information on animal health topics, written for the veterinary professional.

Parasite Control During Pregnancy in Horses

By Patricia L. Sertich, MS, VMD, DACT, New Bolton Center, School of Veterinary Medicine, University of Pennsylvania

Most anthelmintics are safe for use throughout pregnancy, but precautions and contraindications on package inserts should be heeded. In general, 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 and see Anthelmintics. 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.