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ESTRING vs FEMRING

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 21, 2026·How we rate

Possible drug interaction. ESTRING and FEMRING are different prescription medicines. Combining or switching between them can cause interactions — talk to a pharmacist or prescriber before making changes. This page is not medical advice.

estringfemring

Rating

64/100
New

Pharmacy pays

$6.55 /g
$6.55 /g

Type

RX
RX

Active ingredient

ESTRADIOL
ESTRADIOL ACETATE

Manufacturer

Pfizer
Millicent Mfg Pr

Dosage forms

System
Ring

Drug class

Estrogen
Estrogen

Boxed warning

None
Boxed warning

Treats

Breast Neoplasms, Hypogonadism, Premature Menopause
Breast Neoplasms, Hypogonadism, Premature Menopause

Frequently asked questions

Which is cheaper, Estring or Femring?

Pharmacies pay about the same to acquire either one — roughly $6.55 per gm, per the CMS NADAC survey. That is not what you will be charged: your price is set by your insurer and the pharmacy, not by what the drug cost them.

What is the difference between Estring and Femring?

Estring contains Estradiol, while Femring contains Estradiol Acetate — they have different active ingredients.

Ratings are based on FDA regulatory (recall-safety) data. This comparison is for general reference only — not medical advice. Always consult a licensed professional before choosing or switching a medication.