Regu-Mate 1,000mL - Prescription RequiredRegu Mate 1,000mL Altrenogest solution 0. 22%, is indicated to suppress estrus in mares. Allows for management of prolonged estrus conditions and scheduled breeding during the normal breeding season. For oral use in horses only. Dosage & Administration: Give 1mL per 110lbs of body weight orally once daily to supress estrus. *This product requires a prescription from your veterinarian. They can submit it in a few different ways: Fax a prescription form