“…Ketoprofen's half-life in blood plasma was found to be between 2 and 3 h (Martindale, 1996). This short half-life, coupled to the low single administration dosage necessary, renders ketoprofen a very good candidate for the formulation of controlled release dosage forms (Caruso et al, 1982;Houghton et al, 1984a,b;Marcolongo et al, 1984;Morley et al, 1984;Giunchedi et al, 1991;Le Liboux et al, 1994;Habib and Meuse, 1995;Khan et al, 1996;Parejo et al, 1998;Vergote et al, 2001;Roda et al, 2002;Palmieri et al, 2002;Vueba et al, 2004). However, the exact nature of the mechanisms underlying drug controlled release processes is still unknown.…”