FEMRING vs PREMARIN

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated June 7, 2026·How we rate

Possible drug interaction. FEMRING and PREMARIN 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.

Attribute	FEMRING	PREMARIN
Rating	New	New
Pharmacy pays	$6.55 /g	—
Type	RX	RX
Active ingredient	ESTRADIOL ACETATE	ESTROGENS, CONJUGATED
Manufacturer	Millicent Mfg Pr	Wyeth Pharms Inc
Dosage forms	Ring	Tablet
Drug class	Estrogen	Estrogen
Boxed warning	Boxed warning	Boxed warning
Treats	Breast Neoplasms, Hypogonadism, Premature Menopause	—

femring premarin

Rating

New

Pharmacy pays

$6.55 /g

—

Type

Active ingredient

ESTRADIOL ACETATE

ESTROGENS, CONJUGATED

Manufacturer

Millicent Mfg Pr

Wyeth Pharms Inc

Dosage forms

Ring

Tablet

Drug class

Estrogen

Boxed warning

Treats

Breast Neoplasms, Hypogonadism, Premature Menopause

—

Frequently asked questions

What is the difference between Femring and Premarin?

Femring contains Estradiol Acetate, while Premarin contains Estrogens, Conjugated — 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.