I&#x27;m going to have to disagree that you shouldn&#x27;t only need to show chemical equivalence.  You need to show biological equivalence.<p>A few years back the FDA approved a generic version of Wellbutrin.  They didn&#x27;t ask for bioequivalence testing and as a result, the formulation dumped all the drug into the body, drug levels spiked and patients got sick.  The FDA eventually made the company reformulate the drug so that it was truly interchangeable with the branded drug.