Pharmacokinetics of natural progesterone administered in the form of a vaginal tablet

T. Levy, S. Gurevitch, Bar Hava, J. Ashkenazi, A. Magazanik, R. Homburg, R. Orvieto, Z. Ben-Rafael

Research output: Contribution to journalArticlepeer-review

50 Scopus citations


Our study was conducted to assess the pharmacokinetics of natural progesterone administered in the novel formula of an effervescent vaginal tablet. Fifty post-menopausal women, with a median age of 43.5 years (range 28-55), volunteered to participate in the research. All women discontinued their hormonal replacement therapy 1 month prior to the study. The pharmacokinetics of 50 and 100 mg of progesterone administered as a vaginal tablet were evaluated. After the initial administration of 50 mg or 100 mg, a mean serum C(max) of 20.43 ± 8.01 nmol/l and 31.61 ± 12.62 nmol/l (P < 0.0004) was reached at a T(max) of 6.1 ± 2.63 and 6.4 ± 3.35 h respectively. The terminal half-life was 13.18 ± 1.3 and 13.7 ± 1.05 h respectively. Continuous use of the 100-mg tablet resulted in a mean serum progesterone concentration of 26.08 ± 13.96 nmol/l and 21.42 ± 16.32 nmol/l after 14 and 30 days respectively. Women > 40 years were found to have a significantly lower T(max) compared to younger women (P = 0.02). The continuous use of vaginal progesterone did not influence the hormonal, liver or lipid profiles evaluated. Only three (6%) women suffered from mild vaginal irritation. Natural progesterone given as a vaginal tablet is well tolerated, safe and an easily administered treatment. Even in a non-oestrogenized vagina the absorption was efficient and the 100 mg dosage resulted in adequate serum progesterone concentrations.

Original languageEnglish
Pages (from-to)606-610
Number of pages5
JournalHuman Reproduction
Issue number3
StatePublished - 1 Jan 1999
Externally publishedYes


  • Assisted reproductive technology
  • Pharmacokinetics
  • Progesterone
  • Vaginal tablets

ASJC Scopus subject areas

  • Reproductive Medicine
  • Obstetrics and Gynecology


Dive into the research topics of 'Pharmacokinetics of natural progesterone administered in the form of a vaginal tablet'. Together they form a unique fingerprint.

Cite this