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Spironolactone has been identified as an inhibitor of NRG1‐ERBB4 signaling. [142] Spironolactone has been found to act as a potent inhibitor of the pannexin 1 channel, and this action appears to be involved in its antihypertensive effects independently of MR antagonism. [143] Spironolactone has been found to block hERG channels. [144]
[107] [109] [134] Spironolactone is a prodrug, so most of its actions are actually mediated by its various active metabolites. [107] The major active forms of spironolactone are 7α-thiomethylspironolactone (7α-TMS) and canrenone (7α-desthioacetyl-δ 6 -spironolactone).
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
Acetazolamide is an inhibitor of carbonic anhydrase.It is used for glaucoma, epilepsy (rarely), idiopathic intracranial hypertension, and altitude sickness. For the reduction of intraocular pressure (IOP), acetazolamide inactivates carbonic anhydrase and interferes with the sodium pump, which decreases aqueous humor formation and thus lowers IOP.
Pharmacokinetics of 100 mg/day spironolactone and its metabolites Compound C max Tooltip Peak concentrations (day 1) C max Tooltip Peak concentrations (day 15) AUC Tooltip Area-under-the-curve concentrations (day 15) t 1/2 Tooltip Elimination half-life; Spironolactone: 72 ng/mL (173 nmol/L) 80 ng/mL (192 nmol/L) 231 ng•hour/mL (555 nmol ...
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]
Spironolactone, the first member of the class, is also used in the management of hyperaldosteronism (including Conn's syndrome) and female hirsutism (due to additional antiandrogen actions). Most antimineralocorticoids, including spironolactone, are steroidal spirolactones. Finerenone is a nonsteroidal antimineralocorticoid.
The action of drugs on the human body (or any other organism's body) is called pharmacodynamics, and the body's response to drugs is called pharmacokinetics. The drugs that enter an individual tend to stimulate certain receptors, ion channels, act on enzymes or transport proteins. As a result, they cause the human body to react in a specific way.