If you need medicines that contain potentially addictive drugs or narcotics (e.g., some cough medicines, tranquilizers, sleeping pills, antidepressants or stimulants), do the following:

• Declare all drugs, medicinals, and similar products to the appropriate CBP official (comment: it's unclear who the "appropriate CBP official" is when the traveller is using GE);
• Carry such substances in their original containers;
• Carry only the quantity of such substances that a person with that condition (e.g., chronic pain) would normally carry for his/her personal use; and
• Carry a prescription or written statement from your physician that the substances are being used under a doctor's supervision and that they are necessary for your physical well being while traveling.

Please note that only medications that can be legally prescribed in the United States may be imported for personal use. Be aware that possession of certain substances may also violate state laws. As a general rule, the FDA does not allow the importation of prescription drugs that were purchased outside the United States. Please see their Web site for information about the enforcement policy for personal use quantities.
Warning: The U.S. Food and Drug Administration prohibits the importation, by mail or in person, of fraudulent prescription and nonprescription drugs and medical devices. These include unorthodox "cures" for such medical conditions as cancer, AIDS, arthritis or multiple sclerosis. Although such drugs or devices may be legal elsewhere, if the FDA has not approved them for use in the United States, they may not legally enter the country and will be confiscated, even if they were obtained under a foreign physician's prescription.