Losec MUPS is a prescription medication containing 20mg of omeprazole, manufactured by AstraZeneca. Each pack contains 14 tablets. This medication belongs to a class of drugs called proton pump inhibitors (PPIs) used to reduce stomach acid production. MUPS stands for Multiple Unit Pellet System, which is a specialized drug delivery system that allows for controlled release of the active ingredient. The tablets contain multiple small pellets that help optimize the delivery and absorption of omeprazole in the body.