Loop Diuretics · Pharmacology

The 'braking phenomenon' observed with chronic loop diuretic use refers to:

  1. The sudden cessation of drug absorption in the gut
  2. The declining diuresis from sodium reabsorption
  3. The irreversible damage to the loop of Henle
  4. The drug's ability to stop heart failure progression
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Correct answer: The declining diuresis from sodium reabsorption

With long-term use, the kidneys adapt by hypertrophying distal segments of the nephron to reabsorb the excess sodium delivered. This reduces the net diuresis and may require higher doses or the addition of a thiazide diuretic.

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