Which of the following loop diuretics is safe for patients with sulfa allergies?

Ethacrynic acid is the loop diuretic that is considered safe for patients with sulfa allergies. This is because ethacrynic acid does not contain a sulfonamide group, which is often the source of allergic reactions in individuals who are sensitive to sulfa drugs. Consequently, it is an alternative option for patients who cannot tolerate other loop diuretics that do contain sulfa components, such as furosemide, bumetanide, and torsemide.

Understanding the chemical structures of diuretics and their relation to sulfa allergies is crucial. Patients with known sulfa allergies may face serious allergic reactions to medications that contain sulfonamide groups, making it essential to choose an alternative like ethacrynic acid, which bypasses this allergy while still offering similar therapeutic effects as other loop diuretics.