The resistance time of Niraparib tends to vary from person to person, some patients may take Niraparib for a month or so to develop resistance, and some patients may take the medicine for more than a few years without developing resistance. Niraparib is mainly used for ovarian cancer, because each patient’s own body condition is different, the time of drug resistance is often different, some patients may take Niraparib for a month to develop drug resistance, but some patients can take the drug for more than a few years without drug resistance. Patients should follow their doctor’s instructions and have regular checkups. If drug resistance occurs after taking Niraparib, the doctor should make a comprehensive judgment to choose a better treatment plan and replace the drug with another one for subsequent treatment.