I purchased Drontal for my 3 year old cat from the vet. I also applied Revolution to him for fleas, ear mites, etc. I put the Revolution above his shoulder blades so he couldn't lick the treatment. The next day I noticed he was lethargic, salivating alot, especially when sleeping. I called the vet and they said that wasn't a side effect of Drontal. After reading the insert for Drontal on the Internet, those are side effects. Any suggestions? Should I just wait a couple of more days and see if they subside?