  We have applied the Brouers-Sotolongo fractal kinetic equation
(BSf(t,n,{\alpha})), improving notably the precision, to nine cases reported
recently in the literature on drug release. The reason of using this equation
is that it contains as approximations some of the mostly used empirical formula
used in that field. Moreover, this equation is now successfully employed for
the investigation of sorption of contaminants in aqueous media. An important
extension of the BSf(t,n,{\alpha}) has been the introduction of variation of
the fractal time coefficient ({\alpha}(t^{\nu} )). This improvement can lead to
a greater precision of the fits and deduce some hint on the nature of the drug
release process which can give precious information to propose microscopic
molecular ad hoc models. We, therefore, suggest the use of the
BSf(t,n,{\alpha}(t^{\nu})) formula, as a first step, in any detailed
investigation and practical application of drug release data both in vitro and
in vivo studies starting with the Weibull and Hill approximations to follow
properly the physical solution.
