Difference between cr and sr
That said, there is no inherent, objective or absolute definition of what these terms mean when used to describe drug products. About the only thing you can be certain of is that the release rate over time is more of an even keel than the regular / instant-release version.
Like an out-of-tune piano that's still in tune with itself, drugs tend to use those terms accurately within the sub-universe of their own existence. Outside of that, it's anybody's guess. Drug X's "ER" version could be parallel to Drug Y's "CR" version, whereas the "SR" version of Drug Z is closer still. A lot of it is gimmicky marketing, with just enough bioequivalence difference to pass legal muster.
first tablets relased under his process patent were called "Nitroglyn" and made under license by Key Corp., in Florida. Today most are formulated so that the active ingredient is embedded in a matrix of insoluble substance (various: some acrylics, even chitin, these are often patented) so that the dissolving drug has to find its way out through the holes in the matrix. In some SR formula ...more