Apoquel (Oclacitinib)
A targeted Janus kinase (JAK) inhibitor that selectively stops the itch and inflammation pathway in allergic dogs.
💬 In Plain English
Apoquel is a breakthrough daily medication designed specifically for dogs suffering from allergic itch. In allergic dogs, an itch chemical called Interleukin-31 (IL-31) binds to nerves and signals the brain to scratch. Apoquel works by blocking the Janus kinase (JAK-1) enzyme inside cells, essentially unplugging the phone line that delivers the itch message. It starts relieving itching within 4 hours without the widespread hormonal side effects of steroids like prednisone.
🔬 Clinical & Technical Depth
For Vets & TechniciansFormal Clinical Definition
Selective inhibitor of Janus kinase 1 (JAK-1) and JAK-3 enzymes, suppressing cytokine signaling pathways dependent on JAK phosphorylation (principally IL-31, IL-2, IL-4, IL-6, and IL-13) involved in pruritus and allergic inflammation.
Why Veterinarians Use It
Veterinarians prescribe Apoquel for canine atopic dermatitis, flea allergy dermatitis, contact allergy, and food allergy itching.
Clinical Context Encountered
Prescribed as oral tablets given twice daily for 14 days, then tapered to once daily for ongoing maintenance.
Clinical Reference Guide (Veterinary Medication)
What Owners Must Know
- Administer twice daily for the first 14 days, then drop to once daily for ongoing maintenance
- Can be given with or without food
- Fast onset: typically begins relieving itch within 4 hours and achieves full effect by 24 hours
Potential Side Effects
- Mild vomiting or diarrhea (typically transient)
- Lethargy or decreased appetite (rare)
- Susceptibility to demodicosis or superficial pyoderma if immune system is oversuppressed
- •Apoquel is NOT approved for dogs under 12 months of age or dogs with severe active systemic infections or demodicosis.
- •Do not use in cats: Apoquel is formulated and approved specifically for canines.
❓ Questions to Ask Your Veterinarian
Take these actionable questions with you to your next clinic visit or appointment:
- 1Why is Apoquel dosed twice daily for the first 14 days before switching to once-daily maintenance?
- 2Has my dog been screened for secondary skin bacterial (Staph) or yeast (Malassezia) infections?
- 3Is annual routine bloodwork (CBC and chemistry) recommended while on long-term Apoquel?
Academic & Clinical References
- FDA CVM: Apoquel (oclacitinib tablet) Freedom of Information SummaryOrganization: U.S. Food and Drug Administration (FDA CVM) • Accessed: 2026-01-10https://www.fda.gov/animal-veterinary