Pharmacology Hydroxyurea mechanism of action in cancer is by inhibiting the enzyme – A Ribonucleoside diphosphate reductase B Ribonucleotide oxidase C DNA lyase D DNA synthetase 💡 Explanation Hydroxyurea mechanism of action in cancer is by inhibiting the enzyme - ✓ Correct Answer: A. Ribonucleoside diphosphate reductase