If you get motion sickness, try these suggestions: Focus on the horizon or a distant, stationary object. Keep your head still while resting against a seat back. Steer clear of alcohol and smoke. Don't overeat. Avoid spicy and greasy foods. If you become ill, eat dry crackers or drink a carbonated beverage to settle your stomach. To prevent motion sickness, try taking an over-the-counter antihistamine before you travel. Or ask your doctor about a prescription adhesive patch that can help prevent motion sickness.