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Hyperkalemia can occur following an overdose of spironolactone, and this is especially so in people with decreased kidney function. [8] Spironolactone has been studied at extremely high oral doses of up to 2,400 mg per day in clinical trials. [107] [168] Its oral median lethal dose (LD 50) is more than 1,000 mg/kg in mice, rats, and rabbits. [8]
Spironolactone inhibits the effects of mineralocorticoids, namely, aldosterone, by displacing them from the mineralocorticoid receptor (MR) in the cortical collecting duct of kidney nephrons. This decreases the reabsorption of sodium and water while limiting the excretion of potassium.
However, spironolactone is metabolized to three active metabolites, which give it prolonged activity (13.8 – 16. 5 hours). Spironolactone has a long half-life and is excreted 47-51% through kidneys. Patients with chronic kidney disease therefore require close monitoring when taking the drug. Spironolactone is also eliminated through feces (35-41%
When the kidneys detect low blood pressure, the renin–angiotensin–aldosterone system (RAAS) is activated and eventually, aldosterone is secreted. Aldosterone binds to aldosterone receptors (mineralocorticoid receptors) increasing sodium reabsorption in an effort to increase blood pressure and improve fluid status in the body.
In the kidneys, elimination of potassium is passive (through the glomeruli), and reabsorption is active in the proximal tubule and the ascending limb of the loop of Henle. There is active excretion of potassium in the distal tubule and the collecting duct ; both are controlled by aldosterone .
Nephrotoxicity is toxicity in the kidneys. It is a poisonous effect of some substances, both toxic chemicals and medications, on kidney function. [1] There are various forms, [2] and some drugs may affect kidney function in more than one way. Nephrotoxins are substances displaying nephrotoxicity.
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. [5] [6]
Loop diuretics may also precipitate kidney failure in patients concurrently taking an NSAID and an ACE inhibitor—the so-called "triple whammy" effect. [19] Because furosemide, torsemide and bumetanide are technically sulfa drugs, there is a theoretical risk that patients sensitive to sulfonamides may be sensitive to these loop diuretics. This ...