Equine · Equus caballus · typical adult weight 350.00–700.00 kg
Altrenogest is dosed at 0.044 mg/kg PO q24h in horses, per Regumate - altrenogest solution [US product label]. Summit, NJ: Merck Animal Health; 2007. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d9d14df1-ec72-46f1-ad3b-f90547088ff5 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.70 (2026-08-01).. Altrenogest is used in horses for Estrus suppression, pregnancy maintenance. Routes documented in horses: PO. A typical adult horse weighs 350.00–700.00 kg. ExoticRx lists 1 cited dose rule for Altrenogest in horses, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Regu-Mate, Matrix
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| PO | 0.044 mg/kg | q24h | 15 days for synchronization; continuous for pregnancy | Estrus suppression, pregnancy maintenance | Strong | Regumate - altrenogest solution [US product label]. Summit, NJ: Merck Animal Health; 2007. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d9d14df1-ec72-46f1-ad3b-f90547088ff5 — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.70 (2026-08-01). |
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These ranges are per kg. Enter your horse's weight to get the precise dose and draw-up volume — unit and concentration math done for you.
Synthetic progestagen that suppresses estrus by inhibiting gonadotropin release. Used for estrus synchronization in mares and gilts.
EXTREME caution in handling — readily absorbed through skin. Women of childbearing age must use protective gloves. Do not use in horses intended for food.
Species-specific contraindications and adverse-reaction reports for horses may differ from canine / feline reference data — consult the primary citations listed with each rule.
Altrenogest dose range in horses, with cited source references: PO 0.044 mg/kg q24h. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Altrenogest in horses: PO.
Cited course lengths for Altrenogest in horses include: 15 days for synchronization; continuous for pregnancy. Duration depends on the indication — match it to the specific dose rule in the table above.
Altrenogest is indicated in horses for: Estrus suppression, pregnancy maintenance.
These are general warnings for Altrenogest across species; consult the horse dosing table above for species-specific guidance. EXTREME caution in handling — readily absorbed through skin. Women of childbearing age must use protective gloves. Do not use in horses intended for food.
Why a species-specific page? Altrenogest pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in horses — the rules above are the citations specific to this species, not generic recommendations.
Sourced from published veterinary references; awaiting credentialed clinical reviewer. See our editorial process. Reference only — not veterinary advice.