Dumb question - my husband just got a refill on his potassium citrate, and it was a different pill from what he had been taking. The old one was COR 149, the new one is 071 USL. The pharmacist said it was what the Doc ordered when he called it in, and yes, it is a potassium pill. I googled it just to double check, and the only difference I have found is the COR is measured in MEQ, the USL in mEq. Does this make any difference? Thanks for any help.