Promethazine. Promethazine is a prescription antihistamine drug used to treat motion sickness. Care advice for motion sickness: What you should know about motion sickness: Rest - Lie Down, Fluids - Offer Sips, Vomiting.The Bexar County Adult Detention Center offers a variety of educational and religious programs to detainees. Focus on the horizon or on a distant, stationary object. Please review a list of resources in English and en Español. For any questions, please call the Bexar County Clerk Mental Health Office at 210-335-2536. The following strategies can help you avoid or lessen motion sickness. Sit in the front of a car or bus. Get address and hours, parking and transportation information, and health services offered at North Bexar VA Clinic. People with motion sickness commonly experience dizziness; headache; nausea, vomiting, or retching; sweating.