Study Compares Once-daily Metronidazole 1% Gel to Twice-daily ...06 Mar 2006 ...a phase IIIB study comparing the efficacy and safety of once-daily metronidazole 1% gel (MetroGel(R) 1%) to twice-daily azelaic acid 15% gel (Finacea(TM)) in ... - PR Newswire (press release),