MYSOLINE vs QTERNMET XR

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated October 6, 2026·How we rate

Possible drug interaction. MYSOLINE and QTERNMET XR 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	QTERNMET XR
Rating	74/100	New
Pharmacy pays	~$2.89 /30	~$341.96 /30
Type	RX	RX
Active ingredient	PRIMIDONE	DAPAGLIFLOZIN AND METFORMIN HYDROCHLORIDE AND SAXAGLIPTIN HYDROCHLORIDE
Manufacturer	Valeant Pharm Intl	Astrazeneca Ab
Dosage forms	Tablet	Tablet, extended release
Drug class	Anti-Epileptic Agent	—
Boxed warning	None	None
Half-life	—	about 6.2 hours (plasma elimination half-life in adults with normal kidney function)
Treats	Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor	—

mysoline qternmet xr

Rating

74/100

New

Pharmacy pays

~$2.89 /30

~$341.96 /30

Type

Active ingredient

PRIMIDONE

DAPAGLIFLOZIN AND METFORMIN HYDROCHLORIDE AND SAXAGLIPTIN HYDROCHLORIDE

Manufacturer

Valeant Pharm Intl

Astrazeneca Ab

Dosage forms

Tablet

Tablet, extended release

Drug class

Anti-Epileptic Agent

—

Boxed warning

None

Half-life

—

about 6.2 hours (plasma elimination half-life in adults with normal kidney function)

Treats

Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor

—

Frequently asked questions

Which is cheaper, Mysoline or Qternmet XR?

Mysoline costs pharmacies less to acquire — about $2.89 vs $341.96 for a 30-count supply, per the CMS NADAC survey. That gap is in the pharmacy's cost of goods, not necessarily in what you pay: your price is set afterwards by your insurer and the pharmacy.

What is the difference between Mysoline and Qternmet XR?

Mysoline contains Primidone, while Qternmet XR contains Dapagliflozin and Metformin Hydrochloride and Saxagliptin Hydrochloride — 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.