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Conversely, in studies of healthy men given high-dose spironolactone, gynecomastia occurred in 3 of 10 (30%) at 100 mg/day, in 5 of 8 (62.5%) at 200 mg/day, and in 6 of 9 (66.7%) at 400 mg/day, relative to none of 12 controls. [134] [135] The severity of gynecomastia with spironolactone varies considerably, but is usually mild. [110]
Canrenone is an active metabolite of spironolactone, canrenoic acid, and potassium canrenoate, and is considered to be partially responsible for their effects. [9] It has been found to have approximately 10 to 25% of the potassium-sparing diuretic effect of spironolactone, [ 16 ] whereas another metabolite, 7α-thiomethylspironolactone (7α-TMS ...
Eplerenone is a newer drug that was developed as a spironolactone analog with reduced adverse effects. In addition to the y-lactone ring and the substituent on C-7, eplerenone has a 9α,11α-epoxy group. This group is believed to be the reason why eplerenone has a 20-40-fold lower affinity for the mineralocorticoid receptor than spironolactone. [7]
In one study, the threshold dose by subcutaneous injection for endometrial transformation in rabbits was 0.003–0.01 mg for cyproterone acetate, 0.1–0.3 mg for drospirenone, 0.5 mg for progesterone, and 10–20 mg for spironolactone. [119]
[12] [13] Due to its activity as an androgen receptor antagonist and progesterone receptor agonist, spironolactone causes adverse effects, including gynecomastia or decreased libido in males and menstrual abnormalities in females. [14] Spironolactone also causes hyperkalemia [15] and renal insufficiency. [16]
Spironolactone is a prodrug with a short terminal half-life of 1.4 hours. [ 5 ] [ 6 ] [ 7 ] The active metabolites of spironolactone have extended terminal half-lives of 13.8 hours for 7α-TMS, 15.0 hours for 6β-OH-7α-TMS, and 16.5 hours for canrenone, and accordingly, these metabolites are responsible for the therapeutic effects of the drug.