I followed this link:

https://www.americanexpress.com/us/c...fo/retail.html

According to the link, the following are the only stores that qualify for drugstores. Is this it?

You will earn additional rewards ONLY for purchases made in the U.S. at the following list of drugstores that accept the Card:
• CVS Pharmacy
• DUANEreade
• Rite Aid
• Walgreens