Which drug is used primarily as a diuretic?

Bumetanide, commonly known by its brand name Bumex, is primarily used as a diuretic. It belongs to a class of medications known as loop diuretics, which work by inhibiting the reabsorption of sodium and chloride in the kidney, leading to increased urine production. This mechanism is particularly effective for patients suffering from conditions such as heart failure, renal disease, or edema. By reducing fluid overload, Bumetanide helps alleviate symptoms such as swelling and high blood pressure.

On the other hand, the drugs listed as other options serve different purposes. Nitrofurantoin is primarily used as an antibiotic to treat urinary tract infections. Cyclobenzaprine is a muscle relaxant used to relieve muscle spasms. Levothyroxine is a synthetic thyroid hormone used to treat hypothyroidism. Each of these medications has its own specific therapeutic uses, making Bumetanide the appropriate choice for its diuretic property.