Suppresses Estrus and Supports Controlled Breeding in Mares Product Description Altren® (altrenogest) Solution 0.22% is an oral medication for veterinary use, specifically crafted to suppress estrus in mares and help manage their reproductive cycles. This synthetic progestin offers reliable control of estrus once treatment is stopped, making it easier to schedule breeding and enhance reproductive management. It also plays a role in regulating cycles as mares transition from winter anestrus to the natural breeding season, and it aids in handling prolonged estrus conditions in these animals. Benefits Estrus Suppression: Temporarily suppresses estrus in mares, allowing veterinarians and breeders to better manage reproductive cycles and behavior. Predictable Heat Return: Allows for a consistent return to estrus after stopping treatment, which helps manage breeding schedules. Breeding Schedule Support: Aids in planned breeding during the natural breeding season for mares. Transition Season Management: Supports mares moving from winter anestrus to regular seasonal reproductive cycles. Prolonged estrus control: Supports management of mares showing prolonged or irregular estrus behavior during seasonal transition periods. Ingredients Altrenogest 2.2 mg per mL (0.22%) How to Use Recommended-Dosage Chart Approximate Weight (lb) Dose (mL) 770 7 880 8 990 9 1100 10 1210 11 1320 12 Dosage & Administration Instructions Daily oral dose: Administer 1 mL per 110 pounds of body weight once daily for fifteen consecutive days. Oral administration: Deliver the measured solution directly on the mare’s tongue base or mix with the mare’s regular grain ration. Use syringe method: Attach a luer lock syringe to the dispensing cap to measure and draw the correct dose. Veterinary prescription: This medication is restricted for use only by or on the order of a licensed veterinarian. Disclaimer: This dosage information is provided by the manufacturer. Always consult your veterinarian before administering or adjusting any supplement for your pet. Additional Information Precautions Avoid uterine infection: Do not use in mares with current or previous uterine inflammation, such as acute or chronic endometritis. Avoid pregnancy exposure: Pregnant women or those who suspect pregnancy should never handle this medication due to hormonal absorption risks. Protective glove use: Always wear protective gloves when handling this product because altrenogest can be absorbed through the skin. Medical condition caution: Individuals with thromboembolic disorders, liver disease, or hormone-sensitive cancers should avoid handling this product. Possible Side Effects Human hormonal effects: Repeated exposure may disrupt menstrual cycles or cause abdominal cramping due to the hormone activity. Bleeding changes: Continued exposure may cause increased or decreased uterine bleeding or prolonged pregnancy in humans. Headache symptoms: Hormonal exposure to altrenogest may lead to headaches following repeated contact or absorption through the skin. Oil aspiration risk: If swallowed accidentally, the oil-based solution may cause pulmonary complications if aspirated during vomiting. Storage Information Temperature control: Store the product at or below 25°C (77°F) to maintain stability and product quality. Tightly closed bottle: Always close the bottle securely after use to prevent leakage or contamination of the solution. Child safety: Keep the medication stored away from the reach of children and unauthorized handlers to avoid accidental exposure. Shipping & Return We offer ground, express, priority, and international delivery; see our shipping policy for details. For return instructions or product concerns, please refer to our detailed refund policy. Prescription items are NON-RETURNABLE and NON-REFUNDABLE. Frequently Asked Questions Q1: What is Altren® (altrenogest) Solution 0.22% used for in mares? Ans: Altren® (altrenogest) Solution 0.22% is used to suppress estrus in mares. This temporary suppression allows veterinarians and breeders to predict when estrus will occur after treatment withdrawal. It helps regulate reproductive cycles, manage prolonged estrus, and support scheduled breeding during the normal breeding season. Q2: How long does it take for estrus suppression to occur after starting Altren®? Ans: Clinical trials show that estrus is suppressed in approximately 95 percent of mares within three days of starting Altren® treatment. The mare’s return to estrus usually occurs four to five days after treatment stops if ovarian follicles are active. Q3: How should Altren® be administered to mares? Ans: Altren® should be given by mouth at a dosage of 1 mL for every 110 pounds of body weight once daily for fifteen straight days. You can administer the solution directly onto the base of the mare’s tongue or mix it with her grain. Q4: Are there any safety precautions when handling Altren®? Ans: Yes. Altrenogest can be absorbed through the skin, so handlers must wear protective gloves when using the product. Pregnant women or women who may become pregnant should avoid handling the medication because hormonal exposure may disrupt the menstrual cycle or prolong pregnancy. Q5: Can Altren® be used in horses intended for human consumption? Ans: No. Altren® is only labeled for use in horses, not meant for human consumption. The product label clearly states that this medication should not be given to horses that could enter the human food chain.
