Pharmacokinetics and preliminary efficacy of two vaginal gel formulations of ultra-low-dose estriol in postmenopausal women.
Climacteric
; 19(2): 172-80, 2016 Apr.
Article
en En
| MEDLINE
| ID: mdl-26786399
ABSTRACT
OBJECTIVES:
To investigate the pharmacokinetics, safety and preliminary effectiveness of ultra-low-dose estriol vaginal gel formulations (20 µg/g (T1) and 50 µg/g (T2)) compared to Ovestinon® (estriol 500 µg/0.5 g (R)) and placebo in postmenopausal women.METHODS:
Forty-three volunteers were randomly assigned to received T1, T2, R or placebo once daily for 21 days. Absorption of estriol after single and multiple administration was analyzed. Cytological changes in the vagina, tolerability and safety were also investigated.RESULTS:
Thirty-six women were included in the pharmacokinetic analysis. Systemic absorption was lower with test formulations (AUC0-t 171.65 ± 80.18 (T1) and 406.75 ± 199.53 (T2) pg/ml × h) than with Ovestinon® (1221.97 ± 549.06 pg/ml × h). Estriol exposure of the test formulations after multiple administration (AUCss 36.33 ± 30.52 (T1) and 73.71 ± 46.86 (T2) pg/ml × h) was significantly lower than after single-dose administration and not significantly different between them. In contrast, the exposure after repeated administration of Ovestinon® was considerable and not statistically different from levels after single administration. All estriol formulations produced similar improvement in the vaginal maturation value, while placebo showed a small and not significant change. Overall safety and acceptability were good.CONCLUSIONS:
Estriol 20 and 50 µg/g formulations, while showing a comparable capacity for reversing vaginal atrophy, present a highly favorable safety profile, producing a very low systemic absorption of estriol and significantly lower than that of Ovestinon®.Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Posmenopausia
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Estriol
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Geles
Tipo de estudio:
Clinical_trials
Límite:
Aged
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Female
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Humans
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Middle aged
Idioma:
En
Año:
2016
Tipo del documento:
Article