Accumulates in lysosomes, raising pH and inhibiting antigen processing, Toll-like receptor signaling, and cytokine production (TNF-α, IL-1, IL-6). Anti-inflammatory and immunomodulatory without significant immunosuppression. Also has antithrombotic effects.
At a glance
Class
Antimalarial / Immunomodulator
Storage
Store at room temperature below 30°C
Dosing
Used for immune-mediated polyarthritis, discoid lupus erythematosus, and systemi
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →Safety
Fundoscopic/retinal exam q6–12 monthsHepatic enzymesECG (QTc)Clinical response at 8–12 weeks
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →Interactions
No documented interactions.
FAQs
Frequently asked questions
›What is Hydroxychloroquine?
Hydroxychloroquine is a antimalarial / immunomodulator used in pets. Accumulates in lysosomes, raising pH and inhibiting antigen processing, Toll-like receptor signaling, and cytokine production (TNF-α, IL-1, IL-6). Anti-inflammatory and immunomodulatory without significant immunosuppression. Also has antithrombotic effects.
›What is Hydroxychloroquine used for in pets?
Hydroxychloroquine is used in veterinary medicine for: Used for immune-mediated polyarthritis, discoid lupus erythematosus, and systemi; Very limited feline data.
›What is the Hydroxychloroquine dose for dogs?
For dogs, Hydroxychloroquine is typically dosed as follows — Used for immune-mediated polyarthritis, discoid lupus erythematosus, and systemi: 5–10 mg/kg PO q24h. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›What is the Hydroxychloroquine dose for cats?
For cats, Hydroxychloroquine is typically dosed as follows — Very limited feline data: undefined undefined PO N/A. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›Does Hydroxychloroquine need a prescription?
Yes. Hydroxychloroquine is a prescription medication and should only be administered under veterinary supervision.
Educational reference only
This information is provided for educational purposes and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a qualified veterinarian before administering any medication to your pet.
Find a vet near you →References
References
The PetCare.AI drug reference is built from 13 authoritative sources cited across 580 drug monographs.
Textbooks & handbooks — 5
- Plumb's Veterinary Drug Handbook
- Withrow & MacEwen's Small Animal Clinical Oncology
- Merck Veterinary Manual
- NRC Nutrient Requirements of Dogs and Cats
- Veterinary Pharmacology and Therapeutics (Riviere & Papich)
Clinical guidelines & consensus — 4
- ASPCA Animal Poison Control Center Guidelines
- AAHA Diabetes Management Guidelines
- ASPCA Poison Control Guidelines
- RECOVER CPR Guidelines
Journals & peer-reviewed studies — 2
- EPIC Study (J Vet Intern Med 2016)
- JVIM FAT CAT Study
Regulatory & approvals — 1
- CDSCO Veterinary Drug Approval Registry (1969–2026)
Databases — 1
- Washington State University VCPL MDR1 Database