Estring (Estradiol Vaginal Ring) - Summary

ESTRING SUMMARY

ESTRING (estradiol vaginal ring) is a slightly opaque ring with a whitish core containing a drug reservoir of 2 mg estradiol. Estradiol, silicone polymers and barium sulfate are combined to form the ring. When placed in the vagina, ESTRING releases estradiol, approximately 7.5 µg/24 hours, in a consistent stable manner over 90 days. ESTRING has the following dimensions: outer diameter 55 mm; cross-sectional diameter 9 mm; core diameter 2 mm. One ESTRING should be inserted into the upper third of the vaginal vault, to be worn continuously for three months.

ESTRING (estradiol vaginal ring) is indicated for the treatment of urogenital symptoms associated with post-menopausal atrophy of the vagina (such as dryness, burning, pruritus and dyspareunia) and/or the lower urinary tract (urinary urgency and dysuria).

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NEWS HIGHLIGHTS

Published Studies Related to Estring (Estradiol Vaginal Ring)

Effects of oral and transvaginal ethinyl estradiol on hemostatic factors and hepatic proteins in a randomized, crossover study. [2007.06]
CONTEXT: The use of combined hormonal contraceptives with ethinyl estradiol (EE) and a progestin results in alterations in potential biomarkers of venous thromboembolism risk. Evaluation of the impact of delivery route on these changes is difficult due to an interaction between EE and the progestin component. OBJECTIVE: The aim of the study was to compare the impact of oral and vaginal administration of EE alone on hemostatic variables and estrogen-sensitive liver proteins... CONCLUSION: Our results provide evidence that the customary effects of combined hormonal contraceptives on hemostatic variables and estrogen-sensitive liver proteins are largely related to EE and independent of delivery route during short-term treatment.

Efficacy, acceptability and tolerability of the combined contraceptive ring, NuvaRing, compared with an oral contraceptive containing 30 microg of ethinyl estradiol and 3 mg of drospirenone. [2006.12]
CONCLUSION: NuvaRing has comparable efficacy and tolerability to a COC containing 30 microg of EE and 3 mg drospirenone. User acceptability of both methods was high.

Effects on cycle control and bodyweight of the combined contraceptive ring, NuvaRing, versus an oral contraceptive containing 30 microg ethinyl estradiol and 3 mg drospirenone. [2006.09]
BACKGROUND: The objective of this study was to compare cycle control, cycle-related characteristics and bodyweight effects of NuvaRing with those of a combined oral contraceptive (COC) containing 30 microg of ethinyl estradiol and 3 mg of drospirenone... CONCLUSION: NuvaRing was associated with better cycle control than the COC, and there was no clinically relevant difference between the two groups in bodyweight.

Comparative effects of a contraceptive vaginal ring delivering a nonandrogenic progestin and continuous ethinyl estradiol and a combined oral contraceptive containing levonorgestrel on hemostasis variables. [2006.07]
OBJECTIVE: This study aimed to compare the effects on hemostasis variables of a contraceptive vaginal ring with those of an oral contraceptive... CONCLUSION: The contraceptive vaginal ring affected some measured hemostasis variables and sex hormone-binding globulin differently from the oral contraceptive, most likely because of difference in androgenicity of the progestins. The results suggest that the contraindications for oral contraceptive use would also apply to the tested contraceptive vaginal ring.

Clinical performance and menstrual bleeding patterns with three dosage combinations of a Nestorone progestogen/ethinyl estradiol contraceptive vaginal ring used on a bleeding-signaled regimen. [2005.07]
OBJECTIVE: We examined the clinical performance of contraceptive vaginal rings (rings) delivering Nestorone (NES) progestin and ethinyl estradiol (EE). Ring removal times were signaled by menstrual events. Bleeding patterns, adverse events, patterns of use and continuation rates were the principal parameters evaluated... CONCLUSION: Combined contraceptive rings used with a bleeding-signaled regimen led to few terminations attributed to bleeding problems and to acceptable continuation rates. The 150/15 ring appeared to induce fewer bleeding problems than did the lower-dose NES combination rings, but no important difference in 6-month continuation rates among the three doses was noted.

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Clinical Trials Related to Estring (Estradiol Vaginal Ring)

Effect of Angeliq on Blood Pressure (BP) in Postmenopausal Hypertensive Women [Completed]
The objective of the study is to evaluate the effects of Angeliq on BP over a period of 8 weeks in postmenopausal women who may benefit from hormone replacement therapy (HRT) for the relief of vasomotor symptoms and who have hypertension.

Evaluation of Adhesion Quality of a New Formulation of the Mylan Estradiol Transdermal System 0.025 mg/Day and Climara® Transdermal System 0.025 mg/Day [Completed]
The primary objective of this study was to compare the adhesive quality of a new formulation of the Mylan Estradiol Transdermal System with that of Climara® Transdermal System following a single system application in 80 healthy postmenopausal female volunteers. As a secondary objective, primary dermal irritation was assessed after removal of each transdermal system.

Treatment of Hot Flushes in Asian Women With Ultra-Low Dose Estradiol Patch [Completed]
150 postmenopausal Asian women with vasomotor symptoms, after fulfilling the inclusion and exclusion criteria will be enrolled in the study. The women will be randomly assigned to one of two treatment groups (Menostar® or placebo), after which they will be asked to use a patch once a week for 12 weeks.

Vasomotoric Symptoms Study of a 0.5 mg Estradiol and 2.5 mg Dydrogesterone Combination [Completed]

Neoadjuvant Estradiol or Androgen Deprivation in Clinically Localized Prostate Cancer [Completed]
Prostate cancer is the most commonly diagnosed cancer among males in the U. S. More than 220,000 men will be diagnosed with prostate cancer in the USA this year and more that 31,000 will die of this disease.

Androgen deprivation, the elimination of testosterone and its active metabolites, remains the single most effective intervention available for the treatment of advanced prostate carcinoma. Androgen deprivation induces an immune response to normal prostate and prostate cancer, which is usually short-lived. Estradiol induces activation of many arms of the immune system and may be a more effective and long lasting means of inducing immunity to prostate tissue.

This study will treat clinically localized prostate cancer patients with either estrogens, or standard androgen deprivation without estrogens, prior to prostatectomy in order more completely to describe immune regulation by estradiol in men. Control tissue from patients who have not been treated with androgen deprivation will be procured from the Northwest Special Projects in Oncology Research Excellence (SPORE) tissue core and used as comparisons against the cancers treated before prostatectomy. Tumors removed at prostatectomy, tissue samples and blood samples will be assessed for immune system changes.

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