Omeprazole is a pro-drug that accumulates in the acid space of the parietal cell where it is transformed to the active state. However the drug has several characteristics which determine its access to this site of action. Omeprazole is a weak base which is stable at neutral pH but decomposes rapidly in an acidic environment.
In oral drug delivery modi ed release dosage forms (MRD) plays an important role in regulating the drug delivery to improve the quality of therapy. One excellent technique to formulate MRDs is multiple unit particle systems (MUPS), where the dosage form is distributed over multiple units rather than a single unit.