Yes, Dramamine (dimenhydrinate) can be very effective in preventing the motion sickness often associated with intense roller coasters. As an antihistamine, it works by dulling the signals from the inner ear (which senses motion) to the brain, helping to reduce feelings of nausea and dizziness. To be effective, you should take the medication 30 to 60 minutes before you plan to ride. Be aware that the original formula can cause significant drowsiness, which might dampen your theme park experience; many riders prefer the "Non-Drowsy" (Ginger-based) or "Less Drowsy" (Meclizine) versions to stay alert. It is also helpful to stay hydrated and avoid riding on a completely empty or overly full stomach. While it helps with the "spinning" or "dropping" sensation, it won't prevent the physical adrenaline rush, which is part of the fun for many.