MYSOLINE vs NULIBRY

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated October 5, 2026·How we rate

Possible drug interaction. MYSOLINE and NULIBRY 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	MYSOLINE	NULIBRY
Rating	74/100	New
Pharmacy pays	~$2.89 /30	—
Type	RX	RX
Active ingredient	PRIMIDONE	FOSDENOPTERIN HYDROBROMIDE
Manufacturer	Valeant Pharm Intl	Sentynl Theraps Inc
Dosage forms	Tablet	Injectable
Drug class	Anti-Epileptic Agent	Cyclic Pyranopterin Monophosphate
Boxed warning	None	None
Treats	Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor	Inborn Errors Metal Metabolism

mysoline nulibry

Rating

74/100

New

Pharmacy pays

~$2.89 /30

—

Type

Active ingredient

PRIMIDONE

FOSDENOPTERIN HYDROBROMIDE

Manufacturer

Valeant Pharm Intl

Sentynl Theraps Inc

Dosage forms

Tablet

Injectable

Drug class

Anti-Epileptic Agent

Cyclic Pyranopterin Monophosphate

Boxed warning

None

Treats

Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor

Inborn Errors Metal Metabolism

Frequently asked questions

What is the difference between Mysoline and Nulibry?

Mysoline contains Primidone, while Nulibry contains Fosdenopterin Hydrobromide — 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.