The most frequently used antihistamines to treat motion sickness include cyclizine, dimenhydrinate, meclizine, and promethazine (oral and suppository); nonsedating antihistamines appear to be less effective.
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Dimenhydrinate (Dramamine).Take every 4 to 8 hours. Side effects are similar to scopolamine.
Most have a sedative effect which works to 'still' the body and reduce inner ear disturbance. These same pills usually also include a stimulant like caffeine to counteract the sedative effect. Some medications have all the above combined to bombard sea sickness with all cannons firing.
Try The Earplug TrickSimply insert an earplug into one ear; this fools the brain into ignoring signals from your ears and forces it to focus on signals being sent by your eyes. Sailors claim it works best if you plug the ear that is opposite to your dominant hand, such as your left ear if you are right-handed.
Medications or illnessIf you have sinus congestion or a sinus or ear infection or have recently had a concussion, you may be more prone to motion sickness. People who get migraines are also more likely to get motion sickness.
Avoid spicy, greasy, or fatty meals. DO NOT overeat before traveling. Drink plenty of water. Dry crackers and carbonated sodas (such as ginger ale) help some people avoid nausea.
Motion sickness doesn't tend to cause serious problems. Rarely, some people can't stop throwing up. Excessive vomiting can cause dehydration and low blood pressure (hypotension).
Avoiding & Preventing Motion SicknessClose your eyes: Closing your eyes can stop the conflicting messages from the eyes & inner ear. Chewing: Chewing gum or having a snack can reduce mild motion sickness. Fresh air: Opening a window can let fresh air in, slightly reducing motion sickness symptoms.