Magnetic Marker Monitoring of Furosemide-containing Gastroretentive Formulation in Healthy Male Subjects (Fasting and Fed Conditions)

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Furosemide is a diuretic drug, used in the treatment of oedematous states associated with cardiac, renal, and hepatic disorder, and may be effective in patients unresponsive to thiazide diuretics. Furosemide is also used in the treatment of hypertension. Absorption of furosemide from the gastrointestinal tract is fairly rapid; bioavailability is 60-70%, but variable and not predictable, with large intra- and inter-individual variability, and are influenced by dosage form, underlying diseases, and by the presence of food after oral administration. Data from animal model show that furosemide administered into the stomach is more rapidly absorbed than if is administered into the small intestine. To increase the residency of furosemide in the stomach after oral administration, a gastroretentive dosage form (GRDF) of furosemide has been developed. In the current study, the new formulation (30mg furosemide coated tablet) will be tested in healthy male subjects. Absorption will be characterised by an effective and safe imaging technique - Magnetic Marker Monitoring (MMM), based on Fe3O4 added to the drug product to generate magnetic signal that can be used for up to 12 h after furosemide administration to localize the medication in the gastrointestinal tract. Fe3O4 is frequently used as colouring pigment in medicinal products. It does not exhibit own pharmacodynamic activity and is considered as an inactive ingredient. In the current study, GRDF formulation of furosemide will be evaluated for: gastric residence as well as pharmacokinetic and pharmacodynamic characteristics under fasting and fed conditions. As part of the study, the subjects will be hospitalized for 1 day during each drug administration. The duration of the stay will depend on the intestinal behaviour of the investigational product.

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