Ussally Kittens wont get motion sickness.. Just dont let them look out any windows in the car.. That is ussally what makes them sick is watching stuff go by as you drive.. The 3 new babies that we drove in from MOFF was on the road for straight 6 hrs last Monday & did just fine.. They was tired & ready to play due to they slept most of the way.. However I would ask your Vet too..