I adopted an adult male cat about a year ago, Yesterday he started to drool. He soaked my bed spread. I brought him to the vet and he gave him a complete exam. Since he didn't lose his appetite and he was still a bit playful the vet gave him a shot for the drooling a shot for nausea and an antibiotic shot because last November he had an URI and I guess it was precautionary. He is an indoor cat only but very curious. I did clean my toilet bowl and we think he may possibly have drank from it. ( the vet was aware of this) problem is that since coming back from the vet the drooling has restarted and he actually looks sick now. If he did ingest the toilet cleaner, will this pass ? and if so how long will it take ?