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  • Title: A randomized six-day safety study of an antiretroviral microbicide candidate UC781, a non-nucleoside reverse transcriptase inhibitor.
    Author: Schwartz JL, Kovalevsky G, Lai JJ, Ballagh SA, McCormick T, Douville K, Mauck CK, Callahan MM.
    Journal: Sex Transm Dis; 2008 Apr; 35(4):414-9. PubMed ID: 18362865.
    Abstract:
    GOAL: This study evaluated the effect of a single dose and 5 additional consecutive daily doses of UC781 gel at concentrations of 0.1%, 0.25%, 1.0%, and 0% on urogenital irritation. STUDY DESIGN: Forty-eight healthy sexually abstinent women were randomly assigned to 1 of 4 groups. METHODS: Urogenital irritation was assessed by pelvic examination, colposcopy, and reports of genital symptoms at baseline and after 1 and 6 doses. Vaginal health was assessed by wet mount and systemic safety by laboratory evaluation after 1 and 6 doses, and UC781 levels were assessed at baseline and after 6 doses. RESULTS: Some evidence of urogenital irritation was common in all treatment groups and was most often transient and mild. Colposcopic findings were infrequent in the placebo group (8%) and more common in the 3 treatment groups (24%-42%). Edema, which may indicate underlying inflammation, was observed in the vaginal fornix of 2 women exposed to UC781. There was no apparent increase in vaginal infection or clinically significant changes in laboratory values. Two of 12 participants randomized to 1% UC781 gel had detectable plasma levels that were less than the lower level of quantification. CONCLUSIONS: UC781 was well tolerated in this initial dose ranging safety study when used once daily for 6 days in sexually abstinent women. Five safety/pharmacokinetic studies of UC781 are currently underway in women and men, all utilizing UC781 concentrations less than 1%, with twice-daily dosing in some studies, and all involving careful monitoring of exposed epithelium.
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