Underlining the Pharmaceutical Aspects Associated with the Development of pH Responsive Hydrogel

Controlled drug delivery is useful because it allows obtaining better drug product, effectiveness, reliability and safety. Hydrogel are one of the upcoming classes of polymer-based controlled release drug delivery systems. Besides exhibiting swelling-controlled drug release, hydrogel also show stimuli-responsive changes in their structural network and hence, the drug release. Because of large variations in physiological pH at various body sites in normal as well as pathological conditions, pH-responsive polymeric networks have been extensively studied. This review highlights the use of hydrogel (a class of polymeric systems) in controlled drug delivery, and their application in pH-responsive, drug release. Hydrogel show minimal tendency to adsorb proteins from body fluids because of their low interfacial tension. Further, the ability of molecules of different sizes to diffuse into (drug loading) and out of (drug release) hydrogel allows the possible use of dry or swollen polymeric networks as drug delivery systems for oral, nasal, buccal, rectal, vaginal, ocular and parenteral routes of administration. Hydrogel also terms 'intelligent gels' or 'smart hydrogel'. The smartness of any material is the key to its ability to receive, transmit or process a stimulus, and respond by producing a useful effect. This review highlights the use of hydrogel (a class of polymeric systems) in controlled drug delivery, and their application in stimuli responsive, especially pH-responsive, drug release. In this review article, the various aspects of pharmaceutical microemulsin where compile together and the target audience are specifically the M.pharm and B.pharm student so that their knowledge towards the subject concern can be enhanced and also at the same time can be motivated towards the publication.