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). — Plumb's 10th ed (held) printed p.43, Altrenogest monograph spanning p.41-43; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207. 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). — Plumb's 10th ed (held) printed p.43, Altrenogest monograph spanning p.41-43; page located 2026-08-05 from the book's own running heads, and carries this exact dose under the matching species heading. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207 |
Every held source for this drug and species, as printed. Where they differ, both are shown — the choice is yours, not ours.
| Dose (mg/kg) | Route | Source | As printed |
|---|---|---|---|
| 0.044 | PO | Papich Saunders Handbook of Veterinary Drugs, 4th edp.50 | • 0.044 mg/kg (or 1 mL per 110 pounds) orally once per day for 15 days. |
Figures are transcribed from the cited page or table of each held edition and are shown for reference only. They are not dose recommendations, they do not feed the calculator, and none has been reviewed by a veterinarian.
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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.