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By analogy with the more direct Post Date: Tue, 14 Oct 2008 9:28:13 +0000 Many diuretics, such as the thiazides, furosemide, and ethacrynic acid, normally increase potassium output severalfold. This response is greatly ameliorated under the simultaneous influence of amiloride.By analogy with the more direct studies of the mechanisms of electrolyte transport in the toad bladder, it is postulated that amiloride inhibits the secretion of potassium in essentially the same man-ner as does triamterene (Gatzy, 1971). Autor of the post: Undefined Since amiloride retains its activity Post Date: Tue, 14 Oct 2008 9:15:34 +0000 The slight action of amiloride on hydrogen ion transport re-mains unexplained; the drug is not an inhibitor of carbonic anhydrase.Although amiloride has an overall effect on elec-trolyte excretion qualitatively similar to that of an-tagonists of aldosterone, it should be emphasized that it does not act as a competitive antagonist. Since amiloride retains its activity in the absence of adrenal steroids, it is clear that its action at the cellular level of transport is independent of the presence of the steroid hormones . Autor of the post: Undefined Absorption, Distribution, and Metabolism Post Date: Tue, 14 Oct 2008 9:00:46 +0000 Preparations and Clinical Use. While amiloride hydrochloride (MIDAMOR) is employed extensively in Europe, particularly in combination with hy-drochlorothiazide, it is not available in the United States.Absorption, Distribution, and Metabolism. Autor of the post: Undefined The urinary product appears Post Date: Tue, 14 Oct 2008 8:48:51 +0000 After oral administration, from 15 to 26% of the drug is absorbed from the gastrointestinal tract. When given parenterally, amiloride is almost completely excreted in the urine. The urinary product appears to be identical to the parent compound. Autor of the post: Undefined Historically, the xanthines have long been Post Date: Tue, 14 Oct 2008 8:29:16 +0000 However, closely related congeners may become pharmacologically active by conversion to amiloride. After oral admin-XANTHINES, PYRIMIDINES, AND TRIAZINES.Historically, the xanthines have long been known for their diuretic action. Autor of the post: Undefined Within recent years, a large Post Date: Tue, 14 Oct 2008 8:15:44 +0000 Their additional pharmaco-logical properties are discussed in Chapter 19. Of the xanthines, theophylline has the greatest action on the kidney. Within recent years, a large number of re-motely related heterocyclic nitrogenous compounds have been synthesized and assayed for their diuretic activity. Autor of the post: Undefined AmisometradineMechanism of Diuretic Action Post Date: Tue, 14 Oct 2008 8:03:52 +0000 Amisometradine and chlorazanil are repre-sentative aminouracils of this heterogeneous group. Their structural formulas appear on the next page.AmisometradineMechanism of Diuretic Action. Autor of the post: Undefined The urinary response involves Post Date: Tue, 14 Oct 2008 7:50:35 +0000 The stimulatory effect of the xanthines on cardiac function has raised the possibility that diuresis may be the result, in part, of increased renal blood flow and glomerular filtra-tion rate. However, all drugs in this class appear to have a direct action on the renal tubule. The urinary response involves an increase in the rate of sodium and chloride excretion, with no significant effect on urinary acidification. Autor of the post: Undefined Augmentation of potassium excretion Post Date: Tue, 14 Oct 2008 7:31:38 +0000 Diuretic action is only slightly affected by changes in acid-base balance, but is potentiated by the coadministration of carbonic anhydrase inhibitors. It has been postulated that intracellular pH directly affects the intrarenal action of these agents (Nechay, 1964). Augmentation of potassium excretion is not remarkable. Autor of the post: Undefined Theophylline has been a useful Post Date: Tue, 14 Oct 2008 7:14:03 +0000 Unlike the mercurials, the xanthines do not inhibit potassium secretion. Chlorazanil may have a more selective action on potassium transport, as suggested by the blockade of the kaliuretic action of acetazolamide (Williamson et at, 1959); it may possibly act as a weak steroidal antagonist (Skulan and Shideman, 1965). Theophylline has been a useful agent in the study of cellular metabolism and its relation to water and electrolyte permeability (see Handler et ah, 1968). 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