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Evaluation of the physicochemical equivalence of three brands of commercially available quinine sulphate tablets from South Western part of Nigeria Adegbite, A.I. & Adegbolagun, O.M. Abstract Background: The relatively little resistance to quinine globally has led to an increase in its use in P. falciparum malaria especially in multi-drug resistant strains. Objective: To evaluate the physicochemical and equivalency of three brands of quinine sulphate tablets available in South Western region of Nigeria. Methods: The pharmaceutical and chemical equivalence of three brands of quinine sulphate tablets were assessed through the evaluation of some biopharmaceutical parameters and active drug content. Results: All the brands complied with the official specification for uniformity of weight. Two of the brands (A & B) gave similar crushing strengths while the third brand (C) gave a much lower value. Similarly all the brands complied with the official specification of disintegration test but the obtained values were statistically different (p<0.05). The T70 obtained from the dissolution rate profile was less than 45 minutes for the three brands, although A and B were not statistically different but C was statistically from A and B. The quinine content of brands B and C are within the official specification however brand A with percentage content of 110±1.3%w/w, is above the specification while it is statistically different from the other brands. Conclusion: Brands B and C could be regarded as chemical equivalent, but they are not biopharmaceutical equivalents, on the other hand, brands A and B may be regarded as biopharmaceutical equivalents but not chemical equivalent. Keywords Quinine sulphate tablets, non-aqueous titration, chemical equivalence, biopharmaceutical equivalence

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