A poly(allylammonium acrylate) complex was tested for drug release in aqueous solution. Sintered tablets of the polyelectrolyte complex, mixed respectively with human serum albumin, vitamin B-12, S-fluorouracil and tetracycline, were made and dipped into Dulbecco＇s PBS (pH 7.3). The release kinetics, followed spectrophotometrically, is poorly reproducible and very different for the different drugs. An explanation of such behaviours is proposed, based on the chemical structures of the drugs and of the polyelectrolyte complex, as well as on two concurrent processes : the drug extraction and the saturation by the buffer of the poorly uniform drug-complex mechanical mixtures.