Antihistamine Dosages
Antihistamine Dosages
Drug | Dosage |
|---|---|
Diphenhydramine | 2–4 mg/kg, IM, PO, or SC, q 8–12 h as needed |
Hydroxyzine | 0.5–2 mg/kg, PO or IV, q 6–8 h as needed |
Chlorpheniramine | Cats: 2–4 mg/cat, PO, IM, or SC, q 12 h as needed |
Dogs < 20 kg: 4 mg, PO, IM, or SC, q 8 h as needed | |
Dogs >20 kg: 8 mg per dog or 0.25–0.5 mg/kg, PO, IM, or SC, q 8 h as needed | |
Cyproheptadine | 0.25–0.5 mg/kg, PO, q 8 h as needed for appetite stimulation; 1.1 mg/kg, q 12 h as needed for management of dysphoria from serotonin syndrome |
Terfenadine | 5 mg/kg, PO, q 12 h as needed |
Clemastine | Cats: 0.05 mg/kg, PO, q 12 h as needed |
Dogs: 0.1 mg/kg, PO or IV, q 12 h as needed | |
Trimeprazine | 1 mg/kg, PO, q 12 h as needed |
Cetirizine | Dogs: 1 mg/kg or 10–20 mg per dog, PO, q 12–24 h as needed |
Cats: 1 mg/kg or 5 mg/cat, PO, q 12–24 h as needed | |
Fexofenadine | Dogs: 2–5 mg/kg, PO, q 12–24 h as needed |
Cats: 10–15 mg/cat, PO, q 12–24 h as needed |