Chlorhexidine and/or Metronidazole Plus FB301 Pre-treatment Trial

The goal of this study is to evaluate how treatment with FB301 affects the balance of vaginal bacteria in women (aged 18-45) with bacterial vaginosis after pre-treatment with either a vaginal antiseptic wash (chlorhexidine), an oral antibiotic (metronidazole), or both. The main question it aims to answer is: Does treatment with FB301, with or without pre-treatment using a vaginal antiseptic (chlorhexidine) or an oral antibiotic (metronidazole), change the balance of vaginal bacteria, measured by the proportion of two key bacteria (Lactobacillus crispatus and Lactobacillus jensenii), between the start of treatment and follow-up visits over the next 10 weeks? Researchers will compare participants randomly assigned to 4 different groups: * Group 1 will receive FB301for 15 days with the antibiotic (metronidazole) for the first seven days. In the next menstrual cycle, they will receive just FB301 for an additional 15-days. * Group 2 will receive FB301for 15 days. On the first day only, they will first undergo a vaginal cleanse with chlorhexidine (antiseptic solution). In the next menstrual cycle, they will receive just FB301 for an additional 15-days. * Group 3 will receive FB301for 15 days with the antibiotic (metronidazole) for the first seven days. On the first day only, they will first undergo a vaginal cleanse with chlorhexidine (antiseptic solution). In the next menstrual cycle, they will receive FB301 for an additional 15-days following a vaginal cleanse with chlorhexidine (antiseptic solution) on the first day only. * Group 4 will receive just FB301for 15 days. In the next menstrual cycle, they will receive just FB301 for an additional 15-days. Participants will: * Attend the study centre for up to 6 visits * Provide vaginal swab samples at up to 6 visits * Provide vaginal secretion samples using a menstrual disc at up to 4 visits * Have blood samples taken at up to 6 visits * Receive the study treatments for the randomly assigned group over two consecutive menstrual cycles.

NCT Number	NCT07481955
Lead Sponsor	Freya Biosciences ApS Collaborators: CRS Clinical Research Services Berlin GmbH, CRS Clinical Research Services Mannheim GmbH
Conditions	Bacterial Vaginosis (BV)
Enrollment	120 participants
Start Date	2026-03-23
Primary Completion	2027-03-03 (estimated)
Study Completion	2027-04-21 (estimated)
Updated on ClinicalTrials.gov	2026-08-06