What Is Apoquel and What Does It Treat?
Apoquel is a prescription medication used to control itching and inflammation in dogs with allergic skin disease. Its active ingredient is oclacitinib, and it is FDA-approved for dogs. Since its introduction, Apoquel has become one of the most widely used treatments for the maddening, quality-of-life-destroying itch of canine allergies.
Apoquel works in a modern, targeted way. It is a JAK inhibitor (a Janus kinase inhibitor). Itch and allergic inflammation are driven by chemical messengers called cytokines, which send their signals through JAK enzymes inside cells. Apoquel blocks specific JAK enzymes, interrupting the signal — particularly the one for a key “itch cytokine” — and rapidly switching off the sensation of itch.
Veterinarians prescribe Apoquel to control the itch (pruritus) associated with allergic dermatitis, including:
- Atopic dermatitis — environmental/seasonal allergies
- Flea allergy dermatitis
- Food allergy and other allergic skin conditions
What owners value most is speed: Apoquel often reduces itching dramatically within 4 to 24 hours — a fast, visible relief for a dog that has been scratching, licking and chewing itself raw.
It is important to be clear about two things. First, Apoquel controls the itch; it does not cure the underlying allergy — the allergy is still there. Second, because Apoquel modulates the immune system, it carries some specific cautions (see the safety section). Use the calculator above to understand the dosing, but Apoquel must be prescribed and monitored by a veterinarian. For more, see PuppaDogs’ guide to Apoquel for dogs.
How the Apoquel Dosage Calculator Works
The calculator estimates the dose from your dog’s body weight and the treatment phase. It then:
- Shows the 0.4–0.6 mg/kg target dose range and an estimated dose.
- Converts it into a number of 3.6, 5.4 or 16 mg tablets.
- Confirms the induction (twice-daily) or maintenance (once-daily) schedule.
- Flags the important cautions — age, infection, cancer history and parasitic skin disease.
Enter your dog’s weight, choose the treatment phase and the tablet strength, tick any health considerations, then press Calculate Dose.
How Apoquel Doses Are Calculated for Dogs
The Dose
The label dose of Apoquel for dogs is:
0.4–0.6 mg/kg of body weight, per dose.
The Induction-Then-Maintenance Schedule
Apoquel uses a distinctive two-phase schedule:
- Induction phase: the dose is given twice daily (every 12 hours) for up to 14 days, to bring the itch quickly under control.
- Maintenance phase: after that initial period, the same dose is given once daily for ongoing, long-term control.
This is an important rule: the twice-daily dosing should not continue beyond 14 days — after the induction period, it moves to once daily.
Tablet Strengths
Apoquel comes as scored tablets in three strengths — 3.6 mg, 5.4 mg and 16 mg — which lets the dose be matched closely to a dog’s weight. (A chewable version is also available.)
Apoquel Dosage Chart for Dogs
This chart shows the per-dose target range (0.4–0.6 mg/kg). It is a reference only — your veterinarian’s prescription takes priority.
| Dog weight | Per-dose range (0.4–0.6 mg/kg) |
|---|---|
| 5 kg (11 lb) | ~2–3 mg |
| 10 kg (22 lb) | ~4–6 mg |
| 20 kg (44 lb) | ~8–12 mg |
| 30 kg (66 lb) | ~12–18 mg |
| 40 kg (88 lb) | ~16–24 mg |
How to Give Apoquel to Your Dog
- With or without food — both are fine.
- During induction, give it every 12 hours for up to 14 days; then switch to once daily for maintenance.
- Hide the tablet in a small treat, or use the chewable form if your dog prefers it.
- Be consistent — steady dosing keeps the itch controlled.
- Missed dose: give it when you remember and continue on schedule; do not double up.
Side Effects and Safety Warnings
Apoquel is generally well tolerated, and most dogs take it long-term without trouble. The most commonly reported side effects are mild and may include vomiting, diarrhoea or lethargy.
The more important safety considerations come from the fact that Apoquel modulates (partly suppresses) the immune system:
Use With Caution Or Avoid In These Dogs
- Dogs under 12 months of age — Apoquel is not approved for, and should not be used in, dogs younger than a year.
- Pregnant, breeding or nursing dogs — Apoquel should not be used.
- Dogs with a serious or active infection — because Apoquel dampens the immune response, it can allow infections (including skin and ear infections) to worsen. The infection may need to be controlled alongside, or before, starting Apoquel.
- Dogs with demodectic mange or other parasitic skin disease — Apoquel can allow demodicosis to flare; parasites need addressing.
- Dogs with a history of cancer — because Apoquel affects the immune system, it should be used cautiously, weighing the benefits and risks with your vet.
Monitoring
For dogs on long-term Apoquel, veterinarians often recommend periodic check-ups and bloodwork, and owners should watch for and report new or worsening skin or ear infections, or any other change in health.
Apoquel Is Part of an Allergy Plan
Apoquel is excellent at switching off the *itch*, but the allergy itself remains. The best long-term outcomes come from a complete plan: rigorous flea control, good skin and coat care (medicated shampoos, omega-3 fatty acids), treatment of any secondary skin infections, and — where appropriate — identifying what the dog is allergic to through diet trials or allergy testing. Your veterinarian may also discuss other allergy treatments such as the monoclonal antibody injection Cytopoint, or the immune-modulating drug cyclosporine, and PuppaDogs has calculators for antihistamine options including Allegra and Zyrtec.
Conclusion
Apoquel (oclacitinib) is a fast-acting, FDA-approved medication that can transform life for an itchy, allergic dog, dosed at 0.4–0.6 mg/kg — twice daily for up to 14 days, then once daily for maintenance. The calculator above gives you that estimate and converts it into tablets. Because Apoquel modulates the immune system, it must not be used in dogs under 12 months or pregnant dogs, needs caution where infection, parasitic skin disease or a cancer history is present, and should be monitored by your veterinarian — used as one part of a complete, vet-guided plan to control your dog’s allergy.
Frequently Asked Questions
How much Apoquel do I give my dog?
The label dose of Apoquel (oclacitinib) for dogs is 0.4-0.6 mg/kg of body weight per dose. It is given twice daily for up to 14 days (the induction phase), then once daily for ongoing maintenance. As a guide that is roughly 4-6 mg per dose for a 22 lb dog. Your veterinarian sets the exact dose.
How fast does Apoquel work in dogs?
Apoquel works quickly. Many dogs show a dramatic reduction in itching within 4 to 24 hours of the first doses, which is one of the main reasons it is so widely used for allergic dogs that have been scratching and chewing themselves uncomfortable.
How long can a dog stay on Apoquel?
Apoquel is commonly used long-term for ongoing allergic skin disease, with once-daily maintenance dosing after the initial induction period. Long-term use is appropriate under veterinary supervision, often with periodic check-ups and bloodwork. The twice-daily induction dosing, however, should not continue beyond 14 days.
What are the side effects of Apoquel in dogs?
Apoquel is generally well tolerated. The most common side effects are mild – vomiting, diarrhoea or lethargy. The more important consideration is that Apoquel partly suppresses the immune system, so it can allow infections or demodectic mange to worsen; watch for and report any new or worsening skin or ear infections.
Which dogs should not take Apoquel?
Apoquel should not be used in dogs younger than 12 months, or in pregnant, breeding or nursing dogs. It should be used with caution, and full veterinary discussion, in dogs with a serious or active infection, demodectic mange or other parasitic skin disease, or a history of cancer, because it modulates the immune system.
Does Apoquel cure allergies in dogs?
No. Apoquel very effectively controls the itch and inflammation of allergic skin disease, but it does not cure the underlying allergy, which is still present. It works best as part of a complete plan that includes flea control, skin care, treating secondary infections, and where appropriate identifying what the dog is allergic to.
Related PuppaDogs Calculators
Continue building your dog’s personalised care plan with these related PuppaDogs calculators:
- Dog Pregnancy / Whelping Due-Date Calculator
- Puppy Weight Predictor (Adult Weight Calculator)
- Heatstroke Risk Calculator for Dogs
- Bloat (GDV) Risk Calculator for Dogs
- Dog Life Expectancy Calculator (Breed, Body Condition, Lifestyle)
- Spay/Neuter Timing Calculator for Dogs (Breed-Specific)
References & Further Reading
The dosing ranges and safety information on this page are drawn from the following veterinary references. Always defer to your own veterinarian and the manufacturer’s label for your specific product.
- Apoquel (oclacitinib maleate) – FDA-approved veterinary label and prescribing information, Zoetis.
- Plumb DC. Plumb’s Veterinary Drug Handbook. 10th ed. Hoboken, NJ: Wiley-Blackwell, 2023 – oclacitinib monograph.
- Merck Veterinary Manual. Atopic dermatitis in dogs; oclacitinib and immunomodulatory therapy. merckvetmanual.com.
- Olivry T, et al. International Committee on Allergic Diseases of Animals (ICADA) – treatment guidelines for canine atopic dermatitis.
- PuppaDogs. Apoquel for Dogs: Benefits, Dosage, Side Effects, and More. puppadogs.com.
