title: Bioavailability of two dermal formulations of S(+)ibuprofen in rabbit.
abstract: Ibuprofen (CAS 15687-27-1) is widely used in painful situations and, usually, is administered in the racemic form. Since enantiomers may exert different pharmacodinamic and pharmacokinetic effects, the pharmaceutical industry has placed new emphasis on the preparation of new formulations of enantiomerically pure drugs that must be pharmacokinetically characterised prior to their administration in human beings. In this study, the absorption kinetics of two topical formulations of S(+)ibuprofen in rabbits was investigated. The S(+)ibuprofen levels in rabbit plasma were determined by a non-chiral HPLC method, whereas the absence of the R(-)ibuprofen enantiomer in plasma was confirmed by a chiral HPLC method. The results showed that S(+)ibuprofen was absorbed through the rabbit skin upon administration and the obtained levels varied with the formulation.
authors.affiliation: Departamento de Química Orgánica y Farmacéutica, Facultad de Farmacia, Universidad de Navarra, Navarra, Spain. mgpenas@unav.es
authors.forename: Elena
authors.initials: E
authors.lastname: González-Peñas
authors.forename: Hugo Carlos
authors.initials: HC
authors.lastname: Echeverría
authors.forename: Javier
authors.initials: J
authors.lastname: Mosquera
authors.forename: Antonio
authors.initials: A
authors.lastname: Esteras
authors.forename: Leo
authors.initials: L
authors.lastname: Bruseghini
mesh_terms: D000287:Administration, Topical; D000818:Animals; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D002851:Chromatography, High Pressure Liquid; D004355:Drug Stability; D005782:Gels; D007052:Ibuprofen / Q000008:administration & dosage* / Q000493:pharmacokinetics*; D008297:Male; D011817:Rabbits; D015203:Reproducibility of Results; D013237:Stereoisomerism
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D005782:Gels; D007052:Ibuprofen