Millions of people travel with their prescribed prescription drugs.

But you need to protect yourself in case customs or government security officials question those medications. You should always bring a signed doctor’s letter confirming your physician prescribed these medications and the related symptoms.

And make sure your doctor names both the brand name and the generic name of the drug in that letter.

Also make sure to keep your medications in their original bottles. And do some research on your destination. Some don’t allow certain sleeping pills or painkillers, like Ambien in South Korea and the UAE, or Temazepam in Sweden.

And where appropriate, in non-English-speaking countries, it also doesn’t hurt to translate your doctor’s note into that foreign language.