Which of the following is classified as a diuretic?

Lasix, also known as furosemide, is classified as a diuretic because it specifically functions by inhibiting the reabsorption of sodium and chloride in the loop of Henle in the kidney. This results in increased urine production, which helps to lower blood pressure and reduce fluid overload in conditions such as heart failure, liver cirrhosis, or renal disease. Diuretics like Lasix are essential in managing such conditions to help reduce edema and improve symptoms related to fluid retention.

In contrast, Amiodarone is an antiarrhythmic medication used primarily for managing irregular heartbeats; Warfarin is an anticoagulant that acts as a blood thinner to prevent blood clots; and Atorvastatin is a statin used to lower cholesterol levels. None of these medications have the mechanism of action or effects that would qualify them as diuretics.