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  • Title: A sulphonylthiourea (BM 20) related to torasemide: a new loop diuretic with relative potassium-sparing properties.
    Author: Masereel B, Schynts M, Krzesinski JM, Pirotte B, Rorive G, Delarge J.
    Journal: J Pharm Pharmacol; 1993 Aug; 45(8):720-4. PubMed ID: 7901370.
    Abstract:
    A series of sulphonylthioureas related to torasemide, a high ceiling loop diuretic, were synthesized and found to inhibit the Na+ 2Cl- K+ co-transporter of the thick ascending limb of the loop of Henlé. Their diuretic properties were studied (30 mg kg-1) after oral administration to rats. Lipophilic derivatives, very active in-vitro, were found inactive orally and intraperitoneally in rats. The four most active compounds were examined for their dose-dependent diuresis. Three of them showed a potency, water and electrolyte excretion similar to torasemide. The fourth molecule, a sulphonylthiourea (BM 20), exhibited relative potassium-sparing properties and a minimal diuretic dose of 0.001 mg kg-1, 200 times lower than torasemide.
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