Always keep all of your medication in a cool, dry, and dark place. If you are traveling with opioids, you need to make sure that they are stored safely in such a way that others, such as hotel staff, cannot access them. Talk to your doctor about traveling with opioids and whether you need a license. If you take medical marijuana, be aware that it may be illegal in some countries and better left at home. If in doubt, check with your doctor or the embassy of the country you’re traveling to.