Structural analog of thiamine (vitamin B1) that competitively inhibits thiamine uptake by coccidia, disrupting their carbohydrate metabolism and energy production. Selectively toxic to coccidia because they require exogenous thiamine.
At a glance
Class
Anticoccidial (Thiamine Analog)
Storage
Store at room temperature, protect from moisture
Dosing
Used for Isospora (Cystoisospora) coccidiosis in puppies and dogs
Off-label for feline coccidiosis
Safety
Fecal examination for oocysts post-treatmentNeurological signs (thiamine deficiency)Clinical improvement
Interactions
No documented interactions.
FAQs
Frequently asked questions
›What is Amprolium?
Amprolium is a anticoccidial (thiamine analog) used in pets. Structural analog of thiamine (vitamin B1) that competitively inhibits thiamine uptake by coccidia, disrupting their carbohydrate metabolism and energy production. Selectively toxic to coccidia because they require exogenous thiamine.
›What is Amprolium used for in pets?
Amprolium is used in veterinary medicine for: Used for Isospora (Cystoisospora) coccidiosis in puppies and dogs; Off-label for feline coccidiosis.
›What is the Amprolium dose for dogs?
For dogs, Amprolium is typically dosed as follows — Used for Isospora (Cystoisospora) coccidiosis in puppies and dogs: 110–220 mg/kg PO q24h. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›What is the Amprolium dose for cats?
For cats, Amprolium is typically dosed as follows — Off-label for feline coccidiosis: 110–220 mg/kg PO q24h. Always consult your veterinarian for a dose tailored to your pet's weight, age, and condition.
›Does Amprolium need a prescription?
Amprolium is available over the counter. Even so, you should consult your veterinarian before giving any medication to your pet.
References
CDSCO approvals (India) — 1
Amprolium HCl IP 16.67% w/w Sulfaquinoxaline IP 16.67% w/w Powder (veterinary pr
M/s. Vibro Pharma · Approved 03.02.2017
For the treatment of Coccidiosis in poultry
Source: CDSCO Veterinary Drug Approval Registry (1969–2026)
References
Textbooks & handbooks
- Plumb, D.C. Plumb's Veterinary Drug Handbook. 10th ed., Wiley-Blackwell, 2023.
- Vail, D.M., Thamm, D.H., & Liptak, J.M. (eds.). Withrow & MacEwen's Small Animal Clinical Oncology. 6th ed., Saunders/Elsevier, 2020.
- Riviere, J.E., & Papich, M.G. (eds.). Veterinary Pharmacology and Therapeutics. 10th ed., Wiley-Blackwell, 2018.
- National Research Council. Nutrient Requirements of Dogs and Cats. National Academies Press, Washington DC, 2006.
- The Merck Veterinary Manual. Merck & Co., Online edition. https://www.merckvetmanual.com/
Clinical guidelines & consensus
- Fletcher, D.J., Boller, M., Brainard, B.M., et al. "RECOVER Evidence and Knowledge Gap Analysis on Veterinary CPR." Journal of Veterinary Emergency and Critical Care, 2012;22(S1):S102–S131.
- American Animal Hospital Association. 2018 AAHA Diabetes Management Guidelines for Dogs and Cats. AAHA Press.
Journals & peer-reviewed studies
- Hogan, D.F., Fox, P.R., Jacob, K., et al. "Secondary prevention of cardiogenic arterial thromboembolism in the cat: The FAT CAT study." Journal of Veterinary Cardiology, 2015;17(Suppl 1):S306–S317.
- Boswood, A., Häggström, J., Gordon, S.G., et al. "Effect of Pimobendan in Dogs with Preclinical Myxomatous Mitral Valve Disease and Cardiomegaly: The EPIC Study — A Randomized Clinical Trial." Journal of Veterinary Internal Medicine, 2016;30(6):1765–1779.
- ASPCA Animal Poison Control Center. Toxicology and Poison Management Guidelines. American Society for the Prevention of Cruelty to Animals. https://www.aspca.org/pet-care/animal-poison-control
Regulatory & approvals
- Central Drugs Standard Control Organisation (CDSCO), Government of India. Veterinary Drug Approval Registry, 1969–2026. Directorate General of Health Services. https://cdsco.gov.in/
Databases
- Washington State University, College of Veterinary Medicine. Veterinary Clinical Pharmacology Laboratory (VCPL) — MDR1 Multidrug Sensitivity Database. https://vcpl.vetmed.wsu.edu/
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.
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