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Check the destination's rules before taking medicine abroad: cold and cough medicines containing pseudoephedrine or codeine, sleeping pills, psychiatric drugs and strong painkillers; carry them in the original packaging with a prescription or doctor's note, and bring only an amount for your own use

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In plain words

Cold and cough medicines with more than 10% pseudoephedrine or more than 1% codeine are controlled in Japan as stimulant raw materials or narcotics, and you must apply for permission in advance. For sleeping pills, if you bring more than a month's supply, Japan also requires a permit beforehand, and Singapore requires advance application for medicine with controlled ingredients. Carrying the original packaging and a doctor's note, and only an amount for your own use, is how you avoid having the medicine confiscated, a fine or even a prison sentence.

Translated from the Chinese original. Original book, section 21, tip 12. Content may be out of date and rules differ by place. When you actually deal with an agency, a doctor or a court, follow what local officials, doctors and lawyers tell you. Disclaimer