Can I Give My Cat Aspirin?

No
Cats clear aspirin extremely slowly, so it accumulates to toxic levels. Vet-monitored use exists for rare cardiac cases only.
Source: Pet Poison Helpline
Already ingested? Pet Poison Helpline 855-764-7661

The safe habit

Confirm any medication decision with your veterinarian, who knows your cat's health history and other medications. VetDose shows published reference data, not prescriptions.