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Mesoporous silica-based formulations of poorly soluble drugs may exhibit incomplete drug release due to drug remaining adsorbed on the silica surface. The goal of this study was (1) to evaluate the adsorption tendency of atazanavir from aqueous solution onto mesoporous silica (SBA-15) and (2) to determine if the drug release from mesoporous silica formulations was promoted by the presence of an absorptive compartment during dissolution testing. Atazanavir (ATZ) formulations with different drug loadings were prepared by incipient impregn