That's really weird. Any CVS that's open 24-hours has their over-the-counter stuff available, since it's all just sitting out on the shelves. I wonder if the person who maintains CVS' website screwed up and accidentally marked a bunch of stores that are open 24-hours as also having "24/7 pharmacies". I was surprised how many the CVS website said there were in the DC area.

For what it's worth, I know the CVS in Ellicott City, MD is indeed a "24/7 pharmacy", or at least it was a few years ago when I last had to get a prescription filled in the middle of the night.

Send a complaint on CVS' website, and hopefully next time you need it, their website will have been corrected.