1. Tab Avomine 12.5mg about 1-2hrs before journey[Promethazine ] first give 12.5 mg if not helping then give 25 mg ok.......but don't give more than 25mg ok........Can repeat the dose after 12 hours if needed.
2.Avoid over eating, reading. Position themselves where there is least
motion,a supine/recumbent position with the head braced is best. Keeping the axis of
vision at an angle of 45°above horizon may reduce susceptibility.
Next Steps
consult if possible for you