To increase the residency of furosemide in the stomach after oral administration, a gastroretentive dosage form (GRDF) of furosemide has been developed. In this study, the new formulation(30mg furosemide coated tablet) will be tested in healthy male subjects. Absorption will be characterised by imaging technique - Magnetic Marker Monitoring (MMM), which is the most effective and safe imaging technique currently available. MMM is based on a iron-III-oxide (Fe3O4) added to the drug product to generate magnetic signal that can be used to localize the administered medication in the gastrointestinal tract.