Livestock · Ovis aries · typical adult weight 30.00–120.00 kg
Ivermectin is dosed at 0.2 mg/kg PO single dose in sheep, per Ivomec Sheep Drench Dewormer [Product Insert]. Merial — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.739 (2026-08-01).. Ivermectin is used in sheep for GI nematodes, GI nematodes (Haemonchus, Ostertagia, Trichostrongylus). Routes documented in sheep: PO. A typical adult sheep weighs 30.00–120.00 kg. ExoticRx lists 2 cited dose rules for Ivermectin in sheep, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Ivomec, Heartgard
Contraindicated in Tortoise / Turtle
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| PO | 0.2 mg/kg | single dose | — | GI nematodes | Strong | Ivomec Sheep Drench Dewormer [Product Insert]. Merial — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.739 (2026-08-01). |
| PO | 0.2 mg/kg | Once | Single dose | GI nematodes (Haemonchus, Ostertagia, Trichostrongylus) | Strong | Ivomec Sheep Drench Dewormer [Product Insert]. Merial — Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.739 (2026-08-01). |
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These ranges are per kg. Enter your sheep's weight to get the precise dose and draw-up volume — unit and concentration math done for you.
Potentiates glutamate-gated chloride channels in invertebrate nerve and muscle cells, causing paralysis and death of parasites.
TOXIC to MDR1-mutant dogs (Collies, Shelties, Aussies) at elevated doses. DO NOT use in chelonians (turtles/tortoises). Narrow safety margin in some species. Test MDR1 status before use in herding breeds.
Species-specific contraindications and adverse-reaction reports for sheep may differ from canine / feline reference data — consult the primary citations listed with each rule.
Ivermectin dose ranges in sheep, with cited source references: PO 0.2 mg/kg single dose; PO 0.2 mg/kg Once. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Ivermectin in sheep: PO.
Cited course lengths for Ivermectin in sheep include: Single dose. Duration depends on the indication — match it to the specific dose rule in the table above.
Ivermectin is indicated in sheep for: GI nematodes, GI nematodes (Haemonchus, Ostertagia, Trichostrongylus).
These are general warnings for Ivermectin across species; consult the sheep dosing table above for species-specific guidance. TOXIC to MDR1-mutant dogs (Collies, Shelties, Aussies) at elevated doses. DO NOT use in chelonians (turtles/tortoises). Narrow safety margin in some species. Test MDR1 status before use in herding breeds.
Why a species-specific page? Ivermectin pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in sheep — 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.