Horse Health > Vaccines Prodigy with Havlogen with Syringe Price $27.83 Stock status: Out of Stock Stock status: In Stock Product Code: RJ207-655 Qty: Description Sizing Information Reviews Prodigy with Havlogen by Merck-Intervet Prodigy with Havlogen – For vaccination of healthy horses 6 months of age or older as an aid in the prevention of abortion and respiratory disease associated with rhinopneumonitis (EHV-1). Dosage: Pregnant mares - 2 ml IM during 5th, 7th and 9th months of pregnancy. Maiden and barren mares housed or pastured with pregnant mares should receive three 2 ml IM doses at 4-6 week intervals. Booster with a single 2 ml dose annually. U.S. Lic. No. 286.