Sulfonamides · Pharmacology

Sulfonamides can cause the formation of crystals in the urine (crystalluria). Which patient instruction is essential to minimize this risk?

  1. Take the medication together with an acidic fruit juice such as cranberry
  2. Maintain a high fluid intake to ensure adequate urine volume
  3. Take the medication strictly at bedtime
  4. Limit intake of leafy green vegetables
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Correct answer: Maintain a high fluid intake to ensure adequate urine volume

Sulfonamides and their acetylated metabolites are less soluble in acidic or concentrated urine. Maintaining high fluid intake helps dilute the urine and prevents the precipitation of crystals in the renal tubules.

Difficulty: Medium Question 7 of 20

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