After much travel sickness - DS1 crying and yelling and making a right carry on when actually being sick, DS2 making himself sick taking any kind of travel sickness tablets, we eventually got Phenergan prescribed. However, on the box it says to give it the night before. We did this last time we travelled anywhere and the boys, although not actually sick, felt really nauseous, and made a right carry on.
Would it be ok to give it perhaps an hour or two before the journey instead