KOSELUGO vs ZORTRESS

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 20, 2026·How we rate

Possible drug interaction. KOSELUGO and ZORTRESS 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	KOSELUGO	ZORTRESS
Rating	70/100	70/100
Pharmacy pays	—	~$229.16 /30
Type	RX	RX
Active ingredient	SELUMETINIB SULFATE	EVEROLIMUS
Manufacturer	Astrazeneca	Novartis
Dosage forms	Capsule, Powder	Tablet
Drug class	Kinase Inhibitor	Kinase Inhibitor
Boxed warning	None	Boxed warning
Half-life	—	about 30 hours (mean terminal elimination half-life)
Treats	Neurofibromatosis 1	—

koselugo zortress

Rating

70/100

Pharmacy pays

—

~$229.16 /30

Type

Active ingredient

SELUMETINIB SULFATE

EVEROLIMUS

Manufacturer

Astrazeneca

Novartis

Dosage forms

Capsule, Powder

Tablet

Drug class

Kinase Inhibitor

Boxed warning

None

Boxed warning

Half-life

—

about 30 hours (mean terminal elimination half-life)

Treats

Neurofibromatosis 1

—

Frequently asked questions

Which is better-rated, Koselugo or Zortress?

Koselugo and Zortress are tied at 3.5 out of 5 by our independent rating.

What is the difference between Koselugo and Zortress?

Koselugo contains Selumetinib Sulfate, while Zortress contains Everolimus — 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.