Apoquel for Dogs to Stop Itchiness: Is It Safe?
Reading Time:
- What Is Apoquel for Dogs?
- Is Apoquel Safe for Dogs?
- What Is Apoquel Commonly Used for in Dogs?
- What Are the Side Effects of Apoquel for Dogs?
- Medications That May Interact With Apoquel
- How Much Apoquel Should You Give Your Dog?
- How to Give Your Dog Apoquel
- Frequently Asked Questions
If your dog has skin problems caused by allergies, your vet might suggest using Apoquel as part of the treatment.
Apoquel is often used by vets to manage the immune response that causes allergic skin problems.
It’s famous for providing fast itch relief without causing the drowsiness that some other treatments do. But concerns about side effects and immune suppression leave many pet parents unsure. So before making a decision, here’s what you need to know.
What Is Apoquel for Dogs?
Apoquel is a prescription medication used to control itching and inflammation associated with allergic dermatitis in dogs.
Its active ingredient is oclacitinib maleate, a Janus kinase (JAK) inhibitor, which is why the two names are often used interchangeably:
- Apoquel is the brand name manufactured by Zoetis.
- Oclacitinib is the active drug ingredient inside the tablet.
Apoquel is FDA-approved for adult dogs and is available only by prescription from a licensed veterinarian.
It comes in chewable tablets and is approved for both short-term and long-term allergy management.
How Does Apoquel Work?
Apoquel works by inhibiting JAK1 and JAK3 enzymes. These enzymes activate the signaling pathways that produce cytokines responsible for allergic itch and skin inflammation.
By blocking these pathways, Apoquel reduces itching at its source rather than simply masking symptoms.
Apoquel is used twice daily for 2 weeks, then reduced to a once-daily maintenance dose. It generally reduces itching within 24 hours and is considered as effective as corticosteroids for itch control, without many of the long-term side effects associated with steroid use.
The tradeoff is that because JAK enzymes also play a role in immune surveillance, long-term use can suppress parts of the immune system that help detect infections and abnormal cells.
WarningApoquel is not approved for use in cats and should only be used under direct veterinary guidance when specifically prescribed.
Is Apoquel Safe for Dogs?
Apoquel can safely be used in dogs 12 months and older. Apoquel is not for use in dogs with serious infections, or for use in breeding, pregnant, or lactating dogs.
For most dogs, Apoquel is well-tolerated in the short term.
Clinical studies conducted at 18 veterinary colleges across the United States have demonstrated strong results for itch control in dogs with allergic dermatitis.
The product insert warns that Apoquel may exacerbate pre-existing cancerous conditions.
Studies show no consistent increase in cancer development in dogs taking Apoquel compared to control groups, but vets still recommend caution.
Dr. Wesley, assistant professor of practice in the College of Veterinary Medicine at the University of Arizona, avoids it in dogs where cancer is a concern based on history or physical exam findings.
Use extra caution if your dog has:
- Severe secondary infections
- Untreated parasitic or fungal disease
- Autoimmune disease
Because Apoquel affects the immune response, it can increase infection risk in some dogs.
Your vet may recommend bloodwork and a physical exam before starting treatment, and periodic lab work if your dog takes it long-term rather than just for occasional flare-ups.
Apoquel may also increase susceptibility to Demodex mites and isn't recommended for dogs with an active Demodex infection.
Always have a frank conversation with your vet about your dog's full health history before starting Apoquel, especially if your dog has a history of cancer, recurring infections, or autoimmune disease.
What Is Apoquel Commonly Used for in Dogs?
Apoquel is a highly effective prescription medication for helping dogs with allergic itching:
- Atopic dermatitis: chronic, environmental allergy-driven skin inflammation
- Allergic dermatitis: skin reactions from food, contact, or airborne allergens
- Chronic itching that has not responded adequately to antihistamines like Benadryl or Zyrtec
- Breaking the itch-scratch cycle that leads to secondary skin infections
- Short-term relief while a longer-term allergy management plan is established
Apoquel controls itching symptoms; it does not treat the underlying cause of the allergy.
Allergic conditions in dogs don’t always have a single “fix”. For many dogs, ending the itch cycle allows skin to heal and infections to resolve, but the allergy itself remains.
When the trigger is related to something like food or grooming products, identifying and removing the source can make a significant difference.
However, environmental allergies are often chronic and difficult to eliminate entirely, so long-term management is usually required.
In these cases, ongoing treatment such as Apoquel or other options like Cytopoint may be needed to keep the condition under control, and it’s important to ensure your pet responds well to the chosen therapy over time.
ImportantApoquel is only FDA-approved for the treatment of allergic dermatitis in dogs. Use for other skin conditions is considered extra-label (off-label) and should only be done under direct veterinary supervision.
What Are the Side Effects of Apoquel for Dogs?
Apoquel is generally well-tolerated, but there are some important caveats to know. Oclacitinib controls itching, but any underlying skin infection or disease remains and still needs treatment.
Don't let skin problems go unmanaged just because your dog seems comfortable.
Apoquel does not cause cancer, but it may interfere with the body's natural defenses against it. Talk to your vet before use if cancer is known, suspected, or if any unidentified masses are present.
According to the official Apoquel product insert, listed side effects include:
- Vomiting
- Diarrhea
- Lethargy
- Loss of appetite
- Subcutaneous or dermal masses
- Decreased white blood cell counts
- Decreased globulins
- Increased cholesterol and lipase levels
At normal doses, the most commonly reported side effects in practice are vomiting, diarrhea, and mild lethargy. These often improve as the dog adjusts to the medication.
With long-term use, more serious concerns include:
- Increased susceptibility to skin infections, ear infections, and parasitic infestations
- Potential worsening of pre-existing cancerous conditions due to immune suppression
- Rare cases of pneumonia and other systemic infections in long-term studies
ImportantIf your dog develops a new lump, shows signs of a serious infection, or has a known history of cancer, stop Apoquel and contact your veterinarian immediately.
Do not continue use without veterinary guidance in these situations.
When You Should Not Give Your Dog Apoquel
Not every dog is a good candidate for Apoquel. Your vet will assess your dog's full health history before prescribing, but as a general rule, avoid Apoquel if your dog:
- Is under 12 months of age
- Is pregnant, lactating, or intended for breeding
- Has a current diagnosis of a serious infection
- Has a history of cancer or active neoplastic disease
- Has an existing parasitic skin infestation like Demodex: treat the infestation first
- Has untreated fungal disease or autoimmune disease
Your vet may also recommend lab work and a full exam before starting Apoquel, as well as regular bloodwork checks every 6 months for dogs on long-term treatment.
In some cases, treating the underlying condition first, like clearing an active infection or Demodex infestation, may make Apoquel safe to use later.
Medications That May Interact With Apoquel
Apoquel can interact with certain medications. Always inform your vet about everything your dog is currently taking. Known interactions include:
- Immunosuppressive drugs, which can compound immune suppression
- Corticosteroids used concurrently: vets typically avoid combining these long-term
- Medications that affect liver function, since oclacitinib is metabolized by the liver.
Apoquel should also be used with caution when co-administered with other medications that alter immune function. Your vet will assess the full picture before prescribing.
How Much Apoquel Should You Give Your Dog?
Your veterinarian will provide you with the correct Apoquel dosage for your dog based on their weight.
In general, the FDA-approved dosage of Apoquel for dogs is 0.18 mg to 0.27 mg per pound of body weight (0.4 to 0.6 mg per kilogram).
Most commonly, veterinarians recommend that dogs start by taking Apoqueltwice daily for 14 days.
Your vet may gradually taper your dog’s dose for long-term management, with the goal of finding the lowest effective dosage that keeps symptoms under control.
Apoquel tablets come in 3.6 mg, 5.4 mg, and 16 mg strengths. Your vet will select the appropriate tablet size based on your dog's weight.
Apoquel can be given with or without food, following the FDA-approved dosage chart below:
| Weight Range (lb) | Weight Range (kg) | 3.6 mg Tablets | 5.4 mg Tablets | 16 mg Tablets |
|---|---|---|---|---|
| 6.6 - 9.9 | 3.0 - 4.4 | 0.5 | - | - |
| 10.0 - 14.9 | 4.5 - 5.9 | - | 0.5 | - |
| 15.0 - 19.9 | 6.0 - 8.9 | 1 | - | - |
| 20.0 - 29.9 | 9.0 - 13.4 | - | 1 | - |
| 30.0 - 44.9 | 13.5 - 19.9 | - | - | 0.5 |
| 45.0 - 59.9 | 20.0 - 26.9 | - | 2 | - |
| 60.0 - 89.9 | 27.0 - 39.9 | - | - | 1 |
| 90.0 - 129.9 | 40.0 - 54.9 | - | - | 1.5 |
| 130.0 - 175.9 | 55.0 - 80 | - | - | 2 |
Overdose Signs to Look Out For
According to the ASPCA Poison Control, an Apoquel overdose can be serious; you’ll need to watch out for the symptoms below:
- Severe vomiting or diarrhea
- Extreme lethargy or collapse
- Signs of serious infection
- Unusual lumps or swelling appearing rapidly
- Difficulty breathing
If you suspect an overdose, contact your vet or the ASPCA Animal Poison Control Center immediately.
How to Give Your Dog Apoquel
Apoquel chewable tablets are palatable and accepted voluntarily by the majority of dogs, according to a study published in a peer-reviewed veterinary journal.
Most dogs take them without any tricks needed. If your dog is reluctant, here are a few ways to make it easier:
- Offer it as a treat directly from your hand
- Hide it in a small piece of cheese or deli meat
- Tuck it into a spoonful of peanut butter (make sure it is xylitol-free)
- Wrap it in a small piece of bread or a soft dog treat
If a dose is missed, give it as soon as you remember and adjust the next dose timing accordingly. Never double up on doses.
Important Handling NoteApoquel is classified as a hazardous drug and should be handled with care.
Wear gloves when handling the tablets, wash your hands immediately after administering, and avoid handling if you are pregnant or nursing.
Frequently Asked Questions
What should I do if your dog misses a dose of Apoquel?
If you miss giving your dog a dose of Apoquel, just skip that dose. Give the next dose at the usual time and keep following your regular schedule. Do not give extra medicine or two doses at once.
Is Apoquel safe for long-term use in dogs?
Apoquel can be used long-term under veterinary supervision, with regular check-ups and bloodwork (about every 6 months) to monitor health and immune function.
How quickly does Apoquel work in dogs?
Most dogs improve within 24 hours of the first dose, making it faster-acting than many traditional allergy treatments.
Does Apoquel cause cancer in dogs?
Apoquel does not cause cancer, but it may affect immune response, so dogs with a history of cancer should be carefully evaluated before use.
What are the signs of an Apoquel overdose in dogs?
Signs may include vomiting, extreme lethargy, infection symptoms, or new lumps. Contact a vet immediately if overdose is suspected.
Can I suddenly stop giving my dog Apoquel?
Short-term use can usually be stopped safely, but long-term use may cause rebound itching. Always consult your vet before stopping.
What is the difference between Apoquel and Cytopoint?
Apoquel is an oral daily tablet that suppresses immune pathways, while Cytopoint is a monthly injection that targets itch-specific signals with less immune impact.
Approved by:
Dr. Ivana Vukasinovic
Doctor of Veterinary Medicine, University of Belgrade
Ivana Vukasinovic grew up in Serbia and attended the University of Belgrade where she received a degree in Veterinary medicine in 2012 and later completed surgical residency working mostly with livestock. Her first year of practice was split between busy small animal practice and emergency clinic, and after two more years of treating many different species of animals, she opened her own veterinary pharmacy where an interest in canine and feline nutrition emerged with an accent on fighting animal obesity. In her free time, she acts as a foster parent for stray animals before their adoption, likes to read SF books and making salted caramel cookies.
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Please do not ask for emergency or specific medical questions about your pets in the comments. Innovet Pet Products is unable to provide you with specific medical advice or counseling. A detailed physical exam, patient history, and an established veterinarian are required to provide specific medical advice. If you are worried that your pet requires emergency attention or if you have specific medical questions related to your pet’s current or chronic health conditions, please contact or visit your local/preferred veterinarian, an animal-specific poison control hotline, or your local emergency veterinary care center.
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