You can take medicines to prevent vomiting during travel (motion sickness), such as Cinnarizine or Dimenhydrinate. These medicines are usually taken 30-60 minutes before starting your journey for the best effect. In addition, try simple tips like eating lightly before travel, sitting near a window, looking straight ahead, and avoiding strong smells. If you travel frequently or have severe symptoms, it is better to consult a doctor to choose the most suitable medicine for you.