Altren® (altrenogest)

Altren® (altrenogest) Solution 0.22% is indicated to suppress estrus in mares. Suppression of estrus allows for a predictable occurrence of estrus following drug withdrawal. This facilitates the attainment of regular cyclicity during the transition from winter anestrus to the physiological breeding season. Suppression of estrus will also facilitate management of prolonged estrus conditions. Suppression of estrus may be used to facilitate scheduled breeding during the physiological breeding season.

Product Features

  • The cost-effective alternative to Regu-Mate®
  • The same formulation and active ingredient as Regu-Mate®
  • Use to schedule estrus in mares and breeding in mares to maximize breeding efficiency
  • Available in 1000 mL and 150 mL bottles along with FDA-approved vented draw-off cap. Administer orally with dose syringe or by placing directly on feed
  • Altren® can help reduce moodiness and temperament changes due to estrus. You can keep your mare out of heat for all your major events
  • Provides safe, effective suppression of estrus in mares – 95% effective after 3 days of treatment


1,000 mL Bottle – Reorder No: 28006

150 mL Bottle – Reorder No: 28007

Clicking a link on this page will open a PDF file in a new window.
Regu-Mate is a Registered Trademark of Merck Animal Health.