Which medication is contraindicated in cats due to its potential toxicity?

Aspirin is indeed contraindicated in cats due to the potential for toxicity. Cats have a unique metabolism that makes them particularly sensitive to aspirin, which can lead to serious complications such as gastrointestinal upset or bleeding, and in severe cases, can be life-threatening. The liver enzymes in cats do not effectively metabolize aspirin like they do in other species, making even low doses hazardous.

While other medications listed have their own risks, aspirin's specific toxicity profile in felines is well-documented, and it is often recommended that alternative pain relief options be considered for managing conditions in cats. This highlights the importance of understanding species-specific reactions to medications within veterinary practice.