The current project for bioavailability evaluation is integrated by project FAPESP (2010/03133-3) and by the PhD project from the student Marina de Freitas Silva (2009/14658-2), both entitled "Bioavailability of furosemide complexed with beta cyclodextrin: in Vitro - in Vivo Correlation evaluation from Human Volunteers." The study has been approved by the Ethics Committee (CEP) from Faculty of Pharmaceutical Sciences and University Hospital.The bioavailability studies evaluate the drug presence in body, from a pharmaceutical form administration, as a time function. The in vitro-in vivo correlation refers to the rational relation establishment between biological properties, or derived parameters, produced by a pharmaceutical form and its physicochemical properties or characteristics. The establishment of such data correlation may allow in vivo studies replacement demonstrating the need for bioequivalence studies in vitro, in case of changes in the manufacturing process post-registration. In addition, these studies are used in biowaiver applications, as waive from bioequivalence pharmaceuticals studies. To obtain an adequate in vitro-in vivo correlation, some factors must be considered. Initially, it's important that the limit stage from drug absorption to be the dissolution process. In this way, its possible expects an in vitro-in vivo correlation for class II drugs from biopharmaceutical classification, and for controlled drug release systems, since, in both cases, the limit stage process from drug absorption is dissolution. (Amidon et al., 1995).Furosemide is a drug which biopharmaceutical classification is not complete defined, the drug is classified as class II and IV, having problems mainly concerning the permeability parameters determination (WHO, 2006).Based on work from Spricigo and coworks (2008) is intended to conduct a bioavailability study using matrix tablets containing furosemide and cyclodextrin complexed, as it results were significantly better with respect to physicochemical, solubility and dissolution properties of furosemide, when the drug is complexed with cyclodextrin.
News published in Agência FAPESP Newsletter about the scholarship: