MYSOLINE vs PREVACID NAPRAPAC 250 (COPACKAGED)

Independent side-by-side comparison.

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

Possible drug interaction. MYSOLINE and PREVACID NAPRAPAC 250 (COPACKAGED) 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	PREVACID NAPRAPAC 250 (COPACKAGED)
Rating	74/100	New
Pharmacy pays	~$2.89 /30	~$5.20 /30
Type	RX	RX
Active ingredient	PRIMIDONE	LANSOPRAZOLE AND NAPROXEN
Manufacturer	Valeant Pharm Intl	Takeda Pharms Na
Dosage forms	Tablet	Capsule, Oral pellets, Tablet
Drug class	Anti-Epileptic Agent	—
Boxed warning	None	None
Half-life	—	about 1.5 hours (mean, ±1.0) in healthy adults — the label states the plasma elimination half-life is less than two hours
Treats	Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor	—

mysoline prevacid naprapac 250 (copackaged)

Rating

74/100

New

Pharmacy pays

~$2.89 /30

~$5.20 /30

Type

Active ingredient

PRIMIDONE

LANSOPRAZOLE AND NAPROXEN

Manufacturer

Valeant Pharm Intl

Takeda Pharms Na

Dosage forms

Tablet

Capsule, Oral pellets, Tablet

Drug class

Anti-Epileptic Agent

—

Boxed warning

None

Half-life

—

about 1.5 hours (mean, ±1.0) in healthy adults — the label states the plasma elimination half-life is less than two hours

Treats

Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor

—

Frequently asked questions

Which is cheaper, Mysoline or Prevacid Naprapac 250 (Copackaged)?

Mysoline costs pharmacies less to acquire — about $2.89 vs $5.20 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 Prevacid Naprapac 250 (Copackaged)?

Mysoline contains Primidone, while Prevacid Naprapac 250 (Copackaged) contains Lansoprazole and Naproxen — 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.