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Extended Hildebrand Solubility Approach (EHSA) was applied in this research to analyse the equilibrium solubility of sulphadiazine in some { N -methyl-2-pyrrolidone (1) + water (2)} and {Carbitol® (1) + water (2)} mixtures at 313.15 K. Reported experimental solubilities and melting properties of this drug were used for EHSA calculations. Good predictive character of EHSA (with mean deviations lower than 1.7%) was found by using regular polynomials in order five by correlating the interaction parameter ( W ) and the Hildebrand solubility parameter of solvent mixtures free of drug ( δ1+2 ). However, the predictive character of EHSA was almost the same as obtained when logarithmic drug solubilities (log  x3 ) were correlated with  δ1+2  by using a fifth-degree regular polynomial.

Extended Hildebrand solubility approach applied to sulphadiazine in aqueous binary mixtures of Carbitol® and N -methyl-2-pyrrolidone at 313.15 K