Topical creams and ointments can contain ingredients such as baclofen, flurbiprofen, diclofenac, ketamine, lidocaine, dibucaine, and 5-fluorouracil, among others, which can cause serious, even life-threatening, clinical signs in cats.
Small exposures, such as a cat licking the owner's skin after recent application, can result in severe clinical health and gastrointestinal issues.
Suggestions
Avoid allowing your cat to lick any area of your skin where topical creams or ointments have been applied.
Always read the label of any topical product and consult with your veterinarian if you suspect your cat has been exposed.