Pharmacology Hydroxyurea mechanism of action in cancer is by inhibiting the enzyme ? A Ribonucleotide 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. Ribonucleotide diphosphate reductase