Which of the following medications is classified as a diuretic?

Lasix, known generically as furosemide, is classified as a loop diuretic. Diuretics are medications that promote the excretion of urine by acting on the kidneys, thus helping to remove excess fluid from the body. This mechanism is particularly useful in treating conditions such as heart failure, swelling (edema), and hypertension, as it effectively reduces fluid overload and lowers blood pressure.

Furosemide specifically works by inhibiting the sodium-potassium-chloride co-transporter in the ascending loop of Henle in the kidneys, which increases the excretion of sodium and chloride, leading to increased urine production. This action is crucial in managing patients with conditions that result in fluid retention.

The other medications listed do not fall under the category of diuretics. Ondansetron is an antiemetic used to prevent nausea and vomiting. Succinylcholine is a neuromuscular blocker commonly used for rapid sequence intubation in anesthesia. Aspirin is an anti-inflammatory and antiplatelet medication, primarily utilized for pain relief and reducing the risk of heart attacks. Each of these medications serves distinct roles that do not relate to the diuretic effect provided by Lasix.