Final answer:
Furosemide is classified as a loop diuretic, which is used to treat hypertension by inhibiting the reabsorption of Na+ and Cl- in the loop of Henle, increasing urine output.
Step-by-step explanation:
The type of diuretic that furosemide is classified as is a loop diuretic. Loop diuretics are primarily used in medical treatments to address conditions such as hypertension (high blood pressure). Furosemide, commercially known as Lasix, functions by inhibiting the reabsorption of sodium (Na+) and chloride (Cl-) ions in the ascending limb of the loop of Henle within the nephron. This action leads to increased urine output, which is why loop diuretics are also known to cause increased urination. The purpose of this effect is to reduce blood volume and consequently lower blood pressure in patients with hypertension.