I just found this on the CBP website:

"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 U.S."

https://help.cbp.gov/app/answers/det...id/67/search/1

So apparently, the label on the bottle is considered the "prescription" for their purposes.

Here is the location information for CBP at U.S. ports of entry (and departure). I'm going to try showing up at the SFO site the day before my flight with boarding pass in hand for my 7:30AM flight and see what happens. I'll report back.

http://www.cbp.gov/contact/ports

This is, of course, a huge PITA.