title: Development and validation of a discriminative dissolution test for nimesulide suspensions.
abstract: The dissolution test for oral dosage forms has recently widened to a variety of special dosage forms such as suspensions. For class II drugs, such as nimesulide (NMS), this study is very important because formulation problems may compromise drug bioavailability. In the present work, tests with four brands of commercially available NMS (RA, TS, TB, and TC) have been performed in order to study their dissolution at different conditions. The suspensions have been characterized relatively to particle size, pH, and density besides NMS assay and the amount of drug in solution in the suspension vehicles. The dissolution study was conducted using the following media: simulated intestinal fluid, pH 6.8, containing polysorbate 80 (P80) or sodium lauryl sulfate (SLS); phosphate buffer, pH 7.4, with P80 and aqueous solution of SLS. Concerning the quantitative analysis, the UV-VIS spectrophotometry could have been used in substitution to high-performance liquid chromatography since the methodology had been adequately validated. The influence of the drug particle size distribution was significant on the dissolution profiles of NMS formulations, confirming to be a factor that should be strictly controlled in the development of oral suspensions.
authors.affiliation: Programa de Pós-Graduação em Ciências Farmacêuticas, Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Av. Pau Brasil s/n, Edifício CCS, Bloco Bss sala 34-Ilha do Fundão, Rio de Janeiro, Rio de Janeiro, CEP: 21941-590, Brazil. lfonseca@far.fiocruz.br
authors.forename: Laís Bastos
authors.initials: LB
authors.lastname: da Fonseca
authors.forename: Márcio
authors.initials: M
authors.lastname: Labastie
authors.forename: Valéria Pereira
authors.initials: VP
authors.lastname: de Sousa
authors.forename: Nadia Maria
authors.initials: NM
authors.lastname: Volpato
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D010316:Particle Size; D012995:Solubility; D013449:Sulfonamides / Q000008:administration & dosage / Q000737:chemistry*; D013535:Suspensions
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D013449:Sulfonamides; D013535:Suspensions; C012655:nimesulide