Review on Furosemide

Furosemide is a potent loop diuretic used to treat hypertension and edematous conditions associated with heart, renal, and hepatic failure. Its mode of action involves inhibiting chloride reabsorption in the ascending limb of the loop of Henle. However, the exact mechanism is not fully understood. Variability in response to furosemide can occur due to differences in fluid and electrolyte balance, as well as individual differences in drug metabolism and elimination. Both acute and delayed tolerance to furosemide have been reported. The drug is primarily eliminated via the kidneys, and its pharmacokinetics can be influenced by renal function. Furosemide has a high degree of plasma protein binding, limiting its distribution despite its low solubility in water. Variability in bioavailability is attributed to factors such as low solubility, presystemic metabolism, and site-specific absorption. The involvement of a nonspecific organic acid pump in the active secretion of furosemide to its site of action is mentioned. Overall, furosemide therapy requires individualized dosing and close monitoring due to its complex pharmacokinetics and potential for adverse effects.