A pilot study evaluating the safety of vaginal administration of a multi-particulate pellet formulation

Guido Lopes dos Santos Santiago, Hans Verstraelen, Nele Poelvoorde, Steven De Corte, Geert Claeys, Marijke Trog, Ellen De Backer, Bart Saerens, Chris Vervaet, Fabienne De Boeck, Lucas Van Bortel, Jean Paul Remon, Marleen Temmerman, Mario Vaneechoutte, Rita Verhelst

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)


Aim: Quantitative evaluation of the effect caused by vaginal administration of gelatin capsules loaded with starch pellets and lyophilized powder, respectively, on vaginal pH and microflora. Method: Administration of gelatin capsules loaded with fast-disintegrating starch pellets (group P) or lyophilized lactose/skimmed milk (group L) was compared to no intervention (group C) in a 3-way randomized, double-blinded, parallel study with 18 volunteers. Follow-up visits were at day 6 (immediately after administration), day 14 (pill stop), day 22 (after withdrawal bleeding) and day 35 (midcycle). Vaginal pH was measured and swabs were taken for Gram staining and culture to assess the presence of hydrogen peroxide-producing lactobacilli. Colposcopy was performed to assess the occurrence of adverse effects on the vaginal and ectocervical mucosa. Results: No severe adverse events occurred. For all women, vaginal pH and Gram stain were normal from screening until pill stop. Although immediately after withdrawal bleeding, 8 out of 18 women had an elevated pH, a disturbed microflora or lacked hydrogen peroxide-producing lactobacilli, all women had hydrogen peroxide-producing lactobacilli and a normal vaginal pH at midcycle, and all but two had a normal Gram stain. Conclusion: No major differences could be observed between the groups, whereby all changes in pH and microflora could be ascribed to withdrawal bleeding, indicating that gelatin capsules, starch pellets and lyophilized powder are acceptable carrier materials for the vaginal delivery of probiotic strains.

Original languageEnglish
Pages (from-to)399-403
Number of pages5
JournalEuropean Journal of Pharmaceutics and Biopharmaceutics
Issue number3
Publication statusPublished - Nov 2009
Externally publishedYes


  • Bacterial vaginosis
  • Pellet
  • Probiotics
  • Starch
  • Vaginal delivery


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