Accidental Human OTC Analgesic Ingestion in Pets (Ibuprofen, Acetaminophen, Aspirin, Naproxen — Cat Lethality, Dog GI/Renal) — pet safety profile
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Accidental ingestion of human OTC analgesics is the single largest pharmaceutical exposure category reported to the ASPCA Animal Poison Control Center (~17% of all calls in their 2023 Top 10 list).
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Accidental ingestion of human OTC analgesics is the single largest pharmaceutical exposure category reported to the ASPCA Animal Poison Control Center (~17% of all calls in their 2023 Top 10 list). The four core agents — ibuprofen, acetaminophen, aspirin, naproxen — span dramatically different toxicologic profiles in dogs vs cats. Acetaminophen is uniquely catastrophic to cats: a single 325 mg adult tablet can be lethal to a 5 kg cat because cats cannot glucuronidate the parent drug, shunting metabolism to the cytochrome-P450-mediated NAPQI pathway and overwhelming glutathione with resulting hepatic necrosis and methemoglobinemia (chocolate-brown blood, cyanotic mucous membranes, facial edema). Ibuprofen ingestion in dogs is associated with GI ulceration at >50 mg/kg, acute renal failure at >175 mg/kg, and CNS effects at >400 mg/kg; the standard 200 mg tablet in a 10 kg dog (20 mg/kg per tablet) means three to four tablets reaches GI-toxic doses. Naproxen is more dangerous than ibuprofen because of its 70+ hour enterohepatic recirculation half-life in dogs. Aspirin causes Heinz-body anemia in cats and salicylism (vomiting, panting, metabolic acidosis) in dogs. Owner-administered 'helping' with human medications remains a top driver — owners often do not recognize that pet-safe human drug doses do not exist for these agents.
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