What is the onset time for furosemide in the treatment of hyperkalemic emergencies?

What is the onset time for furosemide in the treatment of hyperkalemic emergencies?

• A. 1-2 minutes
• B. 5-15 minutes
• C. 15-30 minutes
• D. 60-90 minutes

Answer: (D)

When furosemide is given intravenously in a hyperkalemic emergency, its effect begins quickly. Diuresis can start within about 5 minutes, with the strongest early effect visible over the next several minutes to about 30 minutes. That makes the 5-15 minute window the best match for the onset of action. The options that are much sooner (1-2 minutes) or much later (60-90 minutes) don’t align with how rapidly IV furosemide begins to promote urinary potassium loss. In short, IV furosemide begins to lower potassium within minutes, contributing to faster correction alongside other therapies.

When furosemide is given intravenously in a hyperkalemic emergency, its effect begins quickly. Diuresis can start within about 5 minutes, with the strongest early effect visible over the next several minutes to about 30 minutes. That makes the 5-15 minute window the best match for the onset of action. The options that are much sooner (1-2 minutes) or much later (60-90 minutes) don’t align with how rapidly IV furosemide begins to promote urinary potassium loss. In short, IV furosemide begins to lower potassium within minutes, contributing to faster correction alongside other therapies.