Radiology Which of the following drugs requires a dose adjustment in patient during radiotherapy in order to prevent radiation toxicity: March 2013 (h) A Vincristine B Dactinomycin C Cyclophosphamide D 6-Mercaptopurine 💡 Explanation Which of the following drugs requires a dose adjustment in patient during radiotherapy in order to prevent radiation toxicity: March 2013 (h) ✓ Correct Answer: B. Dactinomycin