If you go abroad with preexisting medical problems, you should carry a letter from you doctor describing your condition, including information on any prescription medicines that you must take. You should also have the generic names of the drugs. Please leave medicines in their original, labeled containers. These precautions make customs processing easier. A doctor's certificate, however, may not suffice as authorization to transport all prescription drugs to all foreign countries. Travelers have innocently been arrested for drug violations when carrying items not considered to be narcotics in the United States. To ensure that you do not violate the drug laws of the countries that you visit, you may consult the embassy or consulate of those countries for precise information before you leave the United States.
If you have allergies, reactions to certain medicines, or other unique medical problems, you may consider wearing a medical alert bracelet or carrying a similar warning.