What Is Estring? Uses, Dosage, and What You Need to Know in 2026

Estring is a brand-name prescription medication manufactured by Pfizer. It's a soft, flexible vaginal ring that delivers a low, steady dose of estradiol — the primary form of estrogen produced by the ovaries — directly to vaginal tissue. It's used to relieve symptoms that many women experience after menopause when estrogen levels fall sharply.

What Is Estring Used For?

Estring is FDA-approved to treat moderate to severe vulvar and vaginal atrophy (VVA) due to menopause, also called genitourinary syndrome of menopause (GSM). Symptoms of VVA that Estring treats include:

Vaginal dryness

Vaginal burning and irritation

Painful intercourse (dyspareunia)

Urinary urgency and irritation with urination

Important: Estring is a local estrogen therapy. It does not treat systemic menopause symptoms like hot flashes, night sweats, or bone loss. If you need relief from those symptoms in addition to vaginal symptoms, your provider may prescribe a systemic hormone therapy separately or instead.

What Does Estring Contain?

Each Estring ring is a slightly opaque ring with a whitish core. It contains:

2 mg estradiol total (the active hormone)

Silicone polymers (the ring material)

Barium sulfate (allows the ring to show up on X-ray if needed)

Silicone fluid (as a dispersing agent for the estradiol)

The ring dimensions are: outer diameter 55 mm, cross-sectional diameter 9 mm. It's designed to be comfortable and undetectable once in place.

Estring Dosage: How Much Does It Release?

Estring releases approximately 7.5 mcg of estradiol per 24 hours in a consistent, stable manner over 90 days. There is only one dose — Estring is not available in multiple strengths. This is a very low dose compared to systemic hormone therapies (e.g., an estradiol patch delivers 25–100 mcg/day into the bloodstream). The low dose and local delivery minimize systemic absorption.

How to Use Estring

Wash and dry your hands before handling the ring.

Press the ring into an oval shape and insert it as deeply as possible into the upper third of your vagina.

The exact position is not critical — when properly inserted, you should not feel anything. If you feel discomfort, the ring is probably not far enough in.

Leave the ring in place continuously for 90 days. You can leave it in during sexual intercourse, showering, bathing, and exercise.

After 90 days, hook a finger through the ring and pull it out. Replace with a new ring if continued therapy is recommended.

If the ring is accidentally expelled, rinse it with lukewarm water and reinsert it. If you have trouble removing the ring, do not force it — contact your provider.

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Who Should NOT Use Estring

Estring is contraindicated (not safe to use) in women who have:

Undiagnosed abnormal vaginal bleeding

Known or suspected estrogen-dependent cancers (breast, uterus, cervix)

Active blood clots (DVT, PE) or recent stroke or heart attack

Liver disease or impairment

Pregnancy

Is Estring a Controlled Substance?

No. Estring is not a controlled substance and is not listed in any DEA schedule. There are no special prescribing restrictions, no requirement for paper prescriptions, and no limits on refills beyond what your prescriber and insurance allow. It can be prescribed by any licensed provider, including through telehealth.

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How Long Does It Take for Estring to Work?

Most women begin noticing improvement in vaginal dryness and discomfort within 1–2 weeks of inserting Estring. Significant improvement in vaginal pH and tissue health (as measured clinically) typically occurs within 4–12 weeks of continuous use. Full effect may take 2–3 ring cycles (6–9 months) for severe atrophy.

How to Find Estring and What It Costs

Estring requires a prescription and can be difficult to find in stock due to ongoing supply variability. medfinder calls pharmacies near you to identify which ones can fill your Estring prescription and texts you the results. The retail price ranges from $572–$670, but the Pfizer savings card reduces it to as little as $25/fill for commercially insured patients, and GoodRx coupons bring the cash-pay price to around $249.