Low Frequency of Intermittent HIV-1 Semen Excretion in Patients Treated with Darunavir-Ritonavir at 600/100 Milligrams Twice a Day plus Two Nucleoside Reverse Transcriptase Inhibitors or Monotherapy

HIV-1 RNA level and darunavir concentration in the genital tract were measured in 45 men receiving darunavir-ritonavir mono- or tritherapy. At week 48, a low frequency (3/45) of HIV-1 RNA shedding was observed in patients (1 on monotherapy and 2 on triple therapy), although they had undetectable HIV-1 RNA in plasma. The median darunavir seminal plasma concentration was close to the blood plasma free fraction, demonstrating a good penetration of darunavir into the male genital tract.