For det første hæmmer dFdCDP ribonukleotid- reduktase, som er den eneste katalysator for produktionen af deoxynukleosid- trifosfater til DNA- syntesen.
First, dFdCDP inhibits ribonucleotide reductase, which is uniquely responsible for catalysing the reactions that produce deoxynucleoside triphosphates (dCTP) for DNA synthesis.