Ginger blocks the body's reflex to vomit. Ginger can also be taken beforehand to prevent the onset of motion sickness attacks. Take the ginger at least half an hour before leaving on a trip. This will usually prevent any occurence. Ginger is available at druggists and health food stores in candy and lozenge forms for the traveler.
Powdered ginger is available in convenient capsules.
To help prevent bouts of motion sickness follow some commonsense tips. Do not eat a large meal or fill up on greasy foods before traveling. A light meal of dry toast or crackers is recommended since the dry food helps to absorb the excess bile the stomach produces, thus blocking the vomiting urge. Avoid drinking alcoholic beverages before or while traveling. Slowly sip beverages while traveling to maintain fluid intake.