I can't believe that the Sinemet CR has the timed release in one half of the tablet and the Sinemet in the other. No medicine that I know of has those characteristics. Half a tablet or capsule is half the medication, whatever it is (half an aspirin, half a tetracycline pill, half a birth-control pill, etc.). I'd challenge the doctor on this--and maybe get another doctor. Joanne Sandstrom [log in to unmask]