ExoticRx · exoticrx.com/drugs/fexofenadine
US brand names:Allegra
Fexofenadine is dosed at 2–5 mg/kg PO q12-24h in dogs, per Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.549 (2026-08-01).. Verify against current literature before clinical use.
Active metabolite of terfenadine. Non-sedating selective peripheral H1 receptor antagonist that does not cross the blood-brain barrier significantly.
Minimal sedation. No cardiac effects (unlike terfenadine). Limited efficacy data in veterinary patients but considered safe.
Species references:All Cat (Domestic) drugsAll Dog (Domestic) drugs
Each ExoticRx dose rule is graded by the strength of its primary evidence — see the editorial process.
A dog/cat sample is shown here. Cited dosing for all 2 species — reptiles, birds, pocket pets, livestock, and equine — is free on the per-species pages above. Pro adds the weight-based calculator for every species.
| Species | Route | Dose | Frequency | Evidence | Source |
|---|---|---|---|---|---|
| Dog (Domestic) | PO | 2–5 mg/kg | q12-24h | Weak | Verified against Plumb's Veterinary Drug Handbook, 10th Ed, p.549 (2026-08-01). |
| Cat (Domestic) | PO | 5–10 mg/kg | q12-24h | Extrapolated | Plumb's Veterinary Drug Handbook, 9th Ed |
Upgrade to Pro or Student to unlock the full dose ranges and frequency for every species. The drug's mechanism, warnings, indications, and cited sources are free to read.
View PlansSource citations and evidence levels available on the live page. Reference only — verify against current literature before clinical use.