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Controlled drug release is one of the most important methods to increase the therapeutic effects and decrease side effects of drug. In this research, three drugs (piperazine, 8-aminoquinoline, N-phenyl piperazine) were attached chemically to the p-styrene sulphonyl chloride (as monomer), and they were polymerized by AIBN ( Azobis isobutyro nitrile) at 80 °C. Finally, release ability of three polymer-drugs were tested in buffer solution with pH= 1.3 at the temperature 37 °C. The GPC spectra of the polymers showed that polymerization of monomers containing drugs were carried out. The results established that, these polymeric systems are able to release drugs.