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Low-dose spironolactone is generally very well tolerated. [63] Even higher doses of spironolactone, such as 100 mg/day, are well tolerated in most individuals. [63] Dose-dependent side effects of spironolactone include menstrual irregularities, breast tenderness, and enlargement, orthostatic hypotension, and hyperkalemia. [63]
Generally, the starting dose is oral spironolactone 100 mg/day (max 400 mg/day). 40% of people will respond to spironolactone. [22] For nonresponders, a loop diuretic may also be added and generally, furosemide is added at a dose of 40 mg/day (max 160 mg/day), or alternatively (bumetanide or torasemide).
Potassium-sparing diuretics act to prevent sodium reabsorption in the collecting tubule by either binding ENaCs (amiloride, triamterene) or by inhibiting aldosterone receptors (spironolactone, eplerenone). This prevents excessive excretion of K + in urine and decreased retention of water, preventing hypokalemia. [10]
The onset of action of the antimineralocorticoid effects of spironolactone is relatively slow, with the peak effect sometimes occurring 48 hours or more after the first dose. [ 1 ] [ 24 ] Canrenone is an antagonist of the MR as is spironolactone, [ 25 ] but it is slightly more potent in comparison.
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]
This will promote sodium reabsorption and fluid retention, causing diuretic resistance. Other factors includes gut edema which slows down the absorption of oral loop diuretics. Chronic kidney disease (CKD) reduces renal flow rate, reducing the delivery of diuretic molecules into the nephron, limiting sodium excretion and increasing sodium ...
Spirolactones are a class of functional group in organic chemistry featuring a cyclic ester attached spiro to another ring system. The name is also used to refer to a class of synthetic steroids, called steroid-17α-spirolactones, 17α-spirolactosteroids, or simply 17α-spirolactones, which feature their spirolactone group at the C17α position.
For people with hyperplasia of both glands, successful treatment is often achieved with spironolactone or eplerenone, drugs that block the aldosterone receptor. With its antiandrogen effect, spironolactone drug therapy may have a range of side effects in males and females, including gynecomastia and irregular menses. These symptoms occur less ...