I was taking Hyoscyamine ER .375 CAP(substituted for Levsinex), which really worked for me, and my Pharmacy said it was no longer available. They gave me Hyomax SR .375 TAB, which they say is the exactly the same thing, however my stomach says otherwise. I tried to find out the difference between ER & SR and cannot find an explanation. Is it just different becasue one is a Capsule and one is a Tablet. Does anyone know what other generic or brand name drug for Hyoscyamine is a capsule as well?