Feline Aspirin Toxicity Study Guide

Overview and Clinical Importance

Aspirin (acetylsalicylic acid, ASA) is a nonsteroidal anti-inflammatory drug (NSAID) commonly found in households. While aspirin has therapeutic uses in veterinary medicine, cats are uniquely susceptible to aspirin toxicity due to their deficient hepatic conjugation pathways. This species-specific vulnerability makes aspirin toxicity a critical topic for the NAVLE examination.

Feline aspirin toxicity represents a classic example of how species-specific pharmacokinetics affect drug safety. Understanding the metabolic basis for feline sensitivity, recognizing clinical signs, and implementing appropriate treatment are essential competencies for veterinary practice.

Mechanism of Action and Toxicity

Normal Aspirin Pharmacology

Aspirin exerts its effects through irreversible inhibition of cyclooxygenase (COX) enzymes. Unlike other NSAIDs that reversibly bind COX, aspirin covalently acetylates a serine residue (Ser-530) in the COX active site, permanently inactivating the enzyme.