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  • Title: 1,4-Dimorpholino-7-phenylpyrido[3,4-d]pyridazine (SD-511) as a new type of diuretic agent.
    Author: Inada Y, Shibouta Y, Shimakawa H, Nishikawa K, Kikuchi S.
    Journal: Arzneimittelforschung; 1978; 28(7):1105-11. PubMed ID: 582697.
    Abstract:
    Diuretic features of 1,4-dimorpholino-7-phenylpyrido[3,4-d]pyridazine (DS-511) were studied in rats and mice. DS-511 was similar in diuretic effect to that of hydrochlorothiazide (HC) in both species, but was more water diuretic and less potassium-releasing than HC. After oral administration of DS-511 to rats the diuretic effect promptly appeared and lasted for 4 to 5 h. These patterns on onset and duration were similar to those of furosemide and acetazolamide (AZ). DS-511 was effective in experimentally induced acidotic and alkalotic rats. When DS-511 was used in combinations with other diuretics such as HC, AZ and triamterene at their maximum effective doses, urine volume and sodium excretion further increased, but potassium did not. Diuretic activity of DS-511 was not reduced by daily oral administration for 10 days to rats. In rats DS-511 reversed antidiuretic hormone (ADH)-induced antidiuresis. These findings suggest that DS-511 differs in mode and/or site of action from the known diuretics.
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