Custom and Border Patrol: https://help.cbp.gov/s/article/Article-1160?language=en_US
Title
Traveling with Medication
Summary
Date Published 12/28/2021 12:13 PM
Prescription medications should be in their original containers with the doctor's prescription printed on the container. It is advised that you travel with no more than personal use quantities, a rule of thumb is no more than a 90-day supply. If your medications or devices are not in their original containers, you must have a copy of your prescription with you or a letter from your doctor. A valid prescription or doctors note is required on all medication entering the United States.
The U.S. Food & Drug Administration (FDA) is responsible for pharmaceutical admissibility determinations. If you have any questions as to whether a specific pharmaceutical may be imported into the United States, visit the FDA's website, or call (301) 796-0356.
If you are traveling with medication and have questions about the airport checkpoint screening process, and other special circumstances, you may call the Transportation Security Administration (TSA), 72 hours prior at (855) 787-2227 on weekdays, 8 a.m. to 11 p.m. ET and weekends/holidays, 9 a.m. to 8 p.m. ET.
To learn what to expect on your next flight, view the video TSA Cares: Traveling with Medication | Transportation Security Administration.
For additional information about traveling with medication, visit FDA's web page on 5 Tips for Traveling to the U.S with Medications.