Altresyn Solution 0.22 is indicated to suppress estrus in mares. Suppression of estrus allows for a predictable occurrence of estrus following drug withdrawal. Each ml of Altresyn Solution contains 2.2 mg of altrenogest, an active synthetic progestin.
The recommended dosage of Altresyn is 1 ml per 110 lbs. body weight given once daily for 15 consecutive days. Altresyn is for administration orally on back of mare's tongue or applied to usual grain ration.