I inquired about this shortly after Katrina: Walgreens' computer system does allow access to your prescription and insurance information at any of their locations. Likewise, you can order prescriptions through their website, which can access your records.

Though not an issue for me personally, the young lady I spoke with cautioned me to confirm that my prescription insurance would provide coverage across state lines.

Stands to reason, too, that it would be wise to avoid getting to the end of a "number of refills limit" on a crucial/recurring prescription.

Assume other national chains offer comparable access to records.