Here is the dosage information on a website I use for OTC drugs and dogs: Dramamine is an antihistamine that works well at preventing motion sickness in both cats and dogs. This drug works best if given at least ½ hour prior to travel.
Dramamine Dosage
½ hour prior to travel
Dogs weight amount
small 12.5 milligrams
medium 25 milligrams
large 50 milligrams |