Low-dose (0.3 Mg) Synthetic Conjugated Estrogens A is Effective for Managing Atrophic Vaginitis

Objective: Estrogen or combined hormone (estrogen-progestin) therapy is highly efficacious for managing the signs and symptoms of urogenital atrophy. A low, effective estrogen dose may enhance patient acceptance and reduce side effects.

Methods: In this randomized, double-blind, multicenter clinical trial, 71 healthy postmenopausal women with vaginal atrophy (Vaginal Maturation Index < or =55) received either low-dose synthetic conjugated estrogens, A tablets (Cenestin) (SCE-A), 0.3 mg once daily, or placebo for 16 weeks.

Results: Treatment with SCE-A for 16 weeks resulted in a highly significant (P<0.0001) mean increase of 17.7 in the Vaginal Maturation Index compared to a mean increase of 4.1 with placebo treatment. A significant estrogenic improvement was detected as early as 4 weeks (mean increase 14.6). Superficial cells were significantly increased from 2.1% at baseline to 15.9% at week 16 with SCE-A, and parabasal cells were significantly reduced from 23.0% at baseline to 1.6% at week 16 (P<0.01 between treatments for both). Vaginal pH was significantly decreased from 6.2 at week -2 to 5.2 at week 16 with SCE-A compared to placebo (P<0.0001). There were no significant differences between treatment groups in the incidence of treatment-emergent side effects or other measures of safety, except for urinary tract infection, which occurred more frequently in the placebo group.

Conclusions: These results confirm the relatively rapid estrogenic effect and safety of a low-dose (0.3 mg/day) of slow-release SCE-A (Cenestin) in the treatment of vaginal atrophy in postmenopausal women.