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If you plan to spend winter holidays in Jamaica or Dominican Republic, please take prophylaxis using Chloroquine. Adult Dosage: 500mg once a week 2 weeks before entering endemic area. Continue this once a week regimen during stay in endemic area and for extra 4 weeks after leaving area. Children Dosage: 8.3mg/Kg once a week for same duration as adult. If there is not enough weeks (2 weeks) before leaving Canada, double up the initial dose (e.g. adult dose will be 1000mg).