Oral Drug Delivery

Oral route is one of the most extensively  used routes of drug administration because  of its obvious advantages of ease  of administration, improved patient compliance,  and convenience. In immediate  release (IR) dosage forms, there is little  or no control over release of drug from  the dosage form, which most often results  in constantly changing, unpredictable,  and often sub- or supra- therapeutic  plasma concentration. Modified  release (MR) dosage form refers to a  dosage form for which the drug-release  characteristics of time course and/or location  are chosen to accomplish therapeutic  or convenience objectives not offered  by conventional dosage forms.  Extended release (ER) and delayed release  (DR) dosage forms are two types of  MR dosage forms.