Our poor Otis gets extremely carsick. We've tried everything you can get without a prescription, but he still hits that 45 minute wall and just starts puking his guts out. We have a 10 hr drive back to Pennsylvania next Friday, so we went to the vet today to get something for him. They gave us Cerenia (maropitant citrate) to try out. Has anybody used it, and did it work for you?