Adults over 13 years: 2 tablets 20 minutes before start of journey or at onset of nausea.Maximum 4 tablets in 24 hours Children: 20 minutes before journey.7-12 years: 1-2 tablets, 4-7 years: 1 tablet.Maximum 2 tablets in 24 hours.3-4 years: half a tablet.Maximum 1 tablet in 24 hours. Not recommended under 3 years except on medical advice.