I have used CVS and Walmart pharmacy to fill my prescription in the past for NARCO. Of course, they were filled with generic version. I'm concerned because CVS version was colored peachy/pink and capsule form. These were difficult to break in half, so I used a splitter. The Wal-Mart version is white/capsule and I can easily break in half with arthritic hand. Second concern is ( these might be my imagination) Wal-Mart version doesn't seem to be as potent as CVS and leaves me more 'groggy'. CVS used is in Leesville, Louisiana. Wal-Mart used is in Alexandria, Louisiana.