So... on our way to the appointment, baby Leilani got carsick

.Thankfully, when we arrived, they cleaned her up. She weighed in at 2.15lb and completely healthy!!! She received dewormer and another booster.
Sadly, the vet couldn't prescribe anything for her motion sickness since she is so small. I know diphenhydramine and Dramamine are safe to use, but do they actually work?