More sure you travel with enough medication for the length of your trip; the prescription written by your doctor at home will not be valid overseas. you might also want to carry a couple of extras in case of delay, or if one goes down the sink.
Carry medicines in their original packaging with prescription labels showing your name attached.
Ask your doctor to write a note verifying they're only for your personal use, stating what the drug is (not brand), what you're taking them for, and in what dosage.
If you're on an extended
If you use strong, opioid (morphine-based) pain-killers, or treatment for addiction (methadone, for example), many countries require you to get a special permit before you arrive. This may include codeine-based medicines. You may also need a letter from your doctor which outlines which medications you are taking and their dosage.
Contact the relevant embassy in your country for details, should you have any questions before traveling.
Those pills you take every day to boost your immune system or brain function, such as vitamins and supplements, should also be carried in their original packaging, so authorities can identify their contents.
Most western nations have removed codeine from over-the-counter medicines. If there is codeine in a medicine, you'll need a prescription to get it, so the rules above apply.
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