If a cat suddenly convulses and drools, then recovers, it could be due to calcium deficiency or seizures. You can give your cat more calcium supplements and take it to the vet regularly for checkups. If it has seizures, medication may be necessary.

For feline epilepsy, medication is a common treatment option; for example, phenobarbital can be used to control seizures. However, given the potentially significant side effects of long-term phenobarbital use, it is not recommended to use this medication if the cat's seizures are infrequent (e.g., once every few months).