SUMMARY
Recently, the test “Dissolution”, which allows evaluating bioavailability of active ingredients, has become one of the most important tools in the quality control of new and generic drugs development (“biowaiver” procedure). However, for some drugs the use of classical pharmacopoeia buffer solutions in vitro does not always completely adequately reflect their behavior in vivo. As a solution of this problem the group of biorelevant media, which allow simulating dissolution and adsorption of drugs in the gastrointestinal tract of a patient, has been developed.