Adult : PO Motion sickness 50-100 mg 30 mins before travelling; may repeat 6-8 hrly if needed. Nausea and vertigo caused by Meniere's disease 50-100 mg 3-4 times/day. IV/IM Nausea and vertigo caused by Meniere's disease; Motion sickness As 5% soln: 50 mg via IM inj. As 0.5% soln: 50 mg via slow IV inj.