Cat · Felis catus · typical adult weight 2.50–7.00 kg
Liothyronine is dosed at 4.4 mcg/kg PO q8-12h in cats, per Plumb's Veterinary Drug Handbook, 10th ed (2023, held copy; the original seed cited the 9th, which was never consulted) — Plumb's 10th ed (held) printed p.764, Liothyronine monograph spanning p.764-765; page located 2026-08-05 from the book's own running heads, verified to name the drug in its body text. — SOURCE EDITION: Plumb's Veterinary Drug Handbook — ISBN 9781394172207, https://openlibrary.org/isbn/9781394172207. Liothyronine is used in cats for Hypothyroidism (iatrogenic, post-I-131). Routes documented in cats: PO. A typical adult cat weighs 2.50–7.00 kg. ExoticRx lists 1 cited dose rule for Liothyronine in cats, drawn from published veterinary references. Verify against current literature before clinical use.
US trade names: Cytomel
| Route | Dose | Frequency | Duration | Indication | Evidence | Source |
|---|---|---|---|---|---|---|
| PO | 4.4 mcg/kg | q8-12h | May be temporary post-I-131; reassess at 3-6 months | Hypothyroidism (iatrogenic, post-I-131) | Weak | Plumb's Veterinary Drug Handbook, 10th ed (2023, held copy; the original seed cited the 9th, which was never consulted) — Plumb's 10th ed (held) printed p.764, Liothyronine monograph spanning p.764-765; page located 2026-08-05 from the book's own running heads, verified to name the drug in its body text. — 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 (mcg/kg) | Route | Source | As printed |
|---|---|---|---|
| 4.4 | PO | Papich Saunders Handbook of Veterinary Drugs, 4th edp.481 | • 4.4 mcg/kg q8h PO. |
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 triiodothyronine (T3) that directly activates thyroid hormone receptors, increasing basal metabolic rate, protein synthesis, and oxygen consumption.
Short half-life requires multiple daily doses. Narrow therapeutic index. Used when levothyroxine alone is insufficient. Monitor thyroid levels.
Species-specific contraindications and adverse-reaction reports for cats may differ from canine / feline reference data — consult the primary citations listed with each rule.
Liothyronine dose range in cats, with cited source references: PO 4.4 mcg/kg q8-12h. Reference ranges from cited sources — verify against current literature before clinical use.
Documented routes for Liothyronine in cats: PO.
Cited course lengths for Liothyronine in cats include: May be temporary post-I-131; reassess at 3-6 months. Duration depends on the indication — match it to the specific dose rule in the table above.
Liothyronine is indicated in cats for: Hypothyroidism (iatrogenic, post-I-131).
These are general warnings for Liothyronine across species; consult the cat dosing table above for species-specific guidance. Short half-life requires multiple daily doses. Narrow therapeutic index. Used when levothyroxine alone is insufficient. Monitor thyroid levels.
Why a species-specific page? Liothyronine pharmacokinetics differ across species: dose ranges, intervals, and route preferences are not interchangeable. Cross-extrapolation from canine doses is unsafe in cats — 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.