Chemotherapy and Toxicology · USMLE Step 1

A patient develops hemorrhagic cystitis after chemotherapy with cyclophosphamide. Which metabolite is primarily responsible?

  1. Phosphoramide mustard
  2. Acrolein
  3. Cisplatin
  4. Cyclophosphamide itself
Show answer and explanation

Correct answer: Acrolein

Cyclophosphamide is metabolized to acrolein, which is urotoxic and causes hemorrhagic cystitis.

Difficulty: Medium Question 5 of 20

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