Over the past few decades, significant medical
advances have been made in the area of drug delivery
with the development of controlled release
dosage
forms. There are large variety of formulations
devoted to oral controlled drug release, and
also
the varied physical properties that influence
drug
release from these formulations. The release
patterns
can be divided into those that release drug
at
a slow zero or first order rate and those that provide
an initial rapid dose, followed by slow zero or
first
order release of sustained component (1). The
purpose
of the controlled release systems is to maintain
drug concentration in the blood or in target tissues
at a desired value as long as possible
(2). In
other words, they are able to exert a control on the
drug release rate and duration (3). For this purpose,
generally, controlled release system initially release
part of the dose contained in order to attain rapidly
the effective therapeutic concentration of the drug.
Then, drug release kinetics follows a well defined
behavior in order to supply the maintenance dose
enabling the attainment of the desired drug concentration.
Over the past few decades, significant medicaladvances have been made in the area of drug deliverywith the development of controlled releasedosageforms. There are large variety of formulationsdevoted to oral controlled drug release, andalsothe varied physical properties that influencedrugrelease from these formulations. The releasepatternscan be divided into those that release drugata slow zero or first order rate and those that providean initial rapid dose, followed by slow zero orfirstorder release of sustained component (1). Thepurposeof the controlled release systems is to maintaindrug concentration in the blood or in target tissuesat a desired value as long as possible(2). Inother words, they are able to exert a control on thedrug release rate and duration (3). For this purpose,generally, controlled release system initially releasepart of the dose contained in order to attain rapidlythe effective therapeutic concentration of the drug.Then, drug release kinetics follows a well definedbehavior in order to supply the maintenance doseenabling the attainment of the desired drug concentration.
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