Losec MUPS is a prescription medication containing 20mg of omeprazole, manufactured by AstraZeneca. This package contains 14 tablets. Losec MUPS is commonly prescribed for treating certain stomach and esophageal conditions. MUPS stands for Multiple Unit Pellet System, which is a specialized drug delivery technology. The medication comes in the form of tablets containing 20mg of the active ingredient omeprazole. The package contains a 14-day supply of tablets.