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The effect of a hydrophilic polymer, hydroxypropylmethyl cellulose K4M, on the complexation of diclofenac sodium with b- and hydroxypropyl-b-cyclodextrins has been studied. Multicomponent systems were prepared with the drug, both cyclodextrin and the polymer. Phase solubility diagrams revealed the positive effect of the polymer on the complexation of the drug but this effect was found after autoclaving...