Apoquel® for Dogs: Uses, Dosage, and Side Effects

Apoquel® is a prescription allergy medication that helps relieve itching and inflammation caused by allergic skin disease in dogs.

Veterinarians commonly prescribe it to manage atopic dermatitis, flea allergy dermatitis, and other allergic skin conditions.

Here’s how Apoquel® works, when it’s prescribed, possible side effects, and important dosing and safety information.

What Is Apoquel® for Dogs?

Apoquel® (active ingredient oclacitinib) is an FDA-approved prescription medication that helps relieve itching and inflammation caused by allergic skin disease in dogs, including flea allergy dermatitis and atopic dermatitis.

Apoquel® begins working within four hours and helps control itching within 24 hours. Veterinarians may prescribe it for short-term allergy flare-ups or long-term management of chronic skin allergies.

Apoquel® does not cure your dog's underlying allergy but helps control the itching and inflammation caused by it.

How Apoquel® is used: Apoquel® may be used on its own or alongside other allergy treatments, including:

• Omega fatty acid supplements
• Topical therapies and medicated shampoos
• Flea and tick preventives

Your veterinarian will determine the most appropriate treatment plan for your dog's specific condition.

Available formulations: Apoquel® is available as oral tablets and chewable tablets. It is approved only for use in dogs and should not be used in humans.

Extra-label uses: Veterinarians may also prescribe Apoquel® extra-label to treat certain autoimmune and inflammatory conditions in dogs, including:

• Ischemic dermatopathy
• Ear tip dermatososis
• Perianal fistulas
• Pemphigus vulgaris
• Cutaneous lupus erythematosus

Veterinary dermatologists may also prescribe Apoquel® extra-label for some cats with allergic or inflammatory skin disease. However, at the time of publication, safety and effectiveness had not been established in cats.

Your veterinarian will determine whether this medication is appropriate for your pet.

Safety Considerations for Apoquel®

Apoquel® is not appropriate for every dog and should only be used under the guidance of a veterinarian.

Do not use Apoquel® in dogs that:

• Are younger than 12 months of age
• Have a serious infection
• Are breeding, pregnant, or nursing

Before starting Apoquel®, tell your veterinarian about all of your dog's medications, vitamins, supplements, and medical conditions, as some medications may interact with Apoquel®.

Because Apoquel® suppresses the immune system, it may make it more difficult for your dog to fight infections and may increase the risk of cancer in some dogs.

How Apoquel® Works in Dogs

Apoquel® works by blocking signals that trigger itching and inflammation, helping allergic dogs feel more comfortable and scratch less.

The active ingredient in Apoquel® is oclacitinib, a Janus kinase (JAK1) inhibitor. It works by blocking Janus kinase, an important signaling pathway involved in the itch and inflammatory response.

By reducing these signals at the cellular level, Apoquel® decreases itching and skin inflammation associated with allergies. As a result, many dogs experience rapid relief from allergy-related discomfort.

Apoquel® is not a corticosteroid or an antihistamine.

How To Give Apoquel® for Dogs

Give Apoquel® exactly as directed by your veterinarian.

Follow the directions on the prescription label or the instructions provided by your veterinarian. Apoquel® may be given with or without food, although giving it with food may help reduce the risk of digestive upset.

Missed a Dose?

If you miss a dose of Apoquel®, contact your veterinarian for guidance. In many cases, they may recommend giving the missed dose when you remember.

However, if it is almost time for your dog's next scheduled dose, they may advise skipping the missed dose and resuming the normal dosing schedule.

Do not give extra or double doses.

Apoquel® Side Effects

Apoquel® is well tolerated by most dogs, but side effects can occur.

Common side effects include:

• Gastrointestinal upset (vomiting, diarrhea, or loss of appetite)
• Low energy (lethargy)

These side effects are typically short term and often resolve on their own.

Less common side effects may include:

• Elevated liver values
• Skin or ear infections
• Seizures
• Increased thirst
• Demodicosis (skin infection caused by Demodex mites)
• Cancer
• Skin masses

Human Side Effects

Apoquel® is a prescription veterinary medication and is not intended for human use.

• Wash your hands after handling the medication.
• Humans should never take medication prescribed for pets, and pets should never receive medication prescribed for people.

If you accidentally ingest Apoquel®, contact your physician immediately or call the National Poison Control Center at 800-222-1222.

Monitoring Your Dog

No specific monitoring is required while your dog is taking Apoquel®. However, your veterinarian may recommend routine testing based on your dog's health, other medications, or the condition being treated.

When To Call Your Veterinarian

Contact your veterinarian if:

• Your dog develops severe side effects.
• Your dog's condition worsens or does not improve with treatment.
• You suspect your dog has received an overdose.
• You have additional questions or concerns about using Apoquel®.

Apoquel® Overdose

An overdose of Apoquel® is unlikely to cause toxicity, but large overdoses—especially over an extended period—can cause serious side effects and require veterinary attention.

Possible signs of an overdose include:

• Gastrointestinal upset (vomiting or diarrhea)
• Lethargy
• Pneumonia
• Deep infection between the toes (interdigital furunculosis)
• Papillomas (warty growths caused by papillomavirus)

If you suspect your dog has received an overdose, contact your veterinarian immediately or call an animal poison control center. Consultation fees may apply.

• Pet Poison Helpline: (855) 764-7661
• ASPCA Animal Poison Control: (888) 426-4435