ExoticRx · exoticrx.com/drugs/interferon-omega-feline
US brand names:Virbagen Omega
Interferon Omega (Feline) is dosed at 1 MU/kg SC q24h for 5 days, repeat at 14, 60, and 120 days in cats, per VIRBAGEN - Interferon Omega [UK Datasheet for Dogs and Cats]. Virbac SA; 2022. — Verified against BSAVA Small Animal Formulary, 10th Ed, Part A, p.227 (2026-08-01).. Verify against current literature before clinical use.
Feline recombinant interferon omega with antiviral, antiproliferative, and immunomodulatory activity. Species-specific, reducing antibody formation.
Transient fever and lethargy. Approved for feline use in EU/Japan. Not available in US. Species-specific so no neutralizing antibodies.
Species references:All Cat (Domestic) drugsAll Dog (Domestic) drugs
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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 |
|---|---|---|---|---|---|
| Cat (Domestic) | SC | 1 MU/kg | q24h for 5 days, repeat at 14, 60, and 120 days | Moderate | VIRBAGEN - Interferon Omega [UK Datasheet for Dogs and Cats]. Virbac SA; 2022. — Verified against BSAVA Small Animal Formulary, 10th Ed, Part A, p.227 (2026-08-01). |
| Dog (Domestic) | IV | 2.5 MU/kg | q24h for 3 days | Moderate | BSAVA Small Animal Formulary 10th Ed (2020), Part A, PDF p.227 (printed p.211), Interferon omega DOSES, Dogs; corroborated by Plumb's Veterinary Drug Handbook (10th Ed 2023) PDF p.711 (printed p.684), Interferon Omega Feline Origin, DOGS |
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View PlansSource citations and evidence levels available on the live page. Reference only — verify against current literature before clinical use.