Contramyl XR's release mechanism is based on MUPS technology (i.e. different "beads" of short acting and long acting methylphenidate. In order to be considered a "generic", there has to be bio-equivalence - which there indeed is. Some patients in my practice has opted to switch to Contramyl XR, or to initiate on it, while others remain on/ choose to initiate Concerta XR. Both are good products from good pharmaceutical companies.
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