ESTROSTEP 21 vs NORLESTRIN 21 1/50

Independent side-by-side comparison.

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

Attribute	ESTROSTEP 21	NORLESTRIN 21 1/50
Rating	New	New
Pharmacy pays	—	—
Type	RX	RX
Active ingredient	ETHINYL ESTRADIOL AND NORETHINDRONE ACETATE	ETHINYL ESTRADIOL AND NORETHINDRONE ACETATE
Manufacturer	Apil	Parke Davis
Dosage forms	Tablet	Tablet
Drug class	—	—
Boxed warning	None	None
Half-life	about 8 hours	about 8 hours

estrostep 21 norlestrin 21 1/50

Rating

New

Pharmacy pays

—

Type

Active ingredient

ETHINYL ESTRADIOL AND NORETHINDRONE ACETATE

Manufacturer

Apil

Parke Davis

Dosage forms

Tablet

Drug class

—

Boxed warning

None

Half-life

about 8 hours

Frequently asked questions

What is the difference between Estrostep 21 and Norlestrin 21 1/50?

Both Estrostep 21 and Norlestrin 21 1/50 share the active ingredient Ethinyl Estradiol and Norethindrone Acetate.

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.