When traveling internationally, the "golden rule" for packing medications is to keep them in their original, pharmacy-labeled containers. This provides immediate proof of what the substance is, who it was prescribed for, and the correct dosage, which can be critical for customs inspections or if you need medical help abroad. You should always pack your medications in your carry-on bag, never in checked luggage, to ensure you have access to them even if your suitcase is lost or delayed. It is also wise to carry a copy of your prescription or a letter from your doctor, especially for controlled substances like strong painkillers, ADHD medication, or injectables. For supplements and vitamins, while they are less strictly regulated, keeping them in original packaging helps avoid confusion during security screenings. If you use a daily pill organizer, consider filling it after you arrive at your destination rather than traveling with loose, unidentified pills. Finally, check the legality of your specific medications in your destination country—for example, some common over-the-counter cold medicines or stimulants are strictly prohibited in Japan and the UAE, and bringing them could lead to serious legal consequences regardless of a prescription.