MYSOLINE vs TERFONYL

Independent side-by-side comparison.

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

Possible drug interaction. MYSOLINE and TERFONYL 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	TERFONYL
Rating	74/100	72/100
Pharmacy pays	~$2.89 /30	—
Type	RX	RX
Active ingredient	PRIMIDONE	TRISULFAPYRIMIDINES (SULFADIAZINE AND SULFAMERAZINE AND SULFAMETHAZINE)
Manufacturer	Valeant Pharm Intl	Bristol Myers Squibb
Dosage forms	Tablet	Suspension, Tablet
Drug class	Anti-Epileptic Agent	—
Boxed warning	None	None
Treats	Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor	—

mysoline terfonyl

Rating

74/100

72/100

Pharmacy pays

~$2.89 /30

—

Type

Active ingredient

PRIMIDONE

TRISULFAPYRIMIDINES (SULFADIAZINE AND SULFAMERAZINE AND SULFAMETHAZINE)

Manufacturer

Valeant Pharm Intl

Bristol Myers Squibb

Dosage forms

Tablet

Suspension, Tablet

Drug class

Anti-Epileptic Agent

—

Boxed warning

None

Treats

Partial Epilepsies, Tonic-Clonic Epilepsy, Tremor

—

Frequently asked questions

Which is better-rated, Mysoline or Terfonyl?

By our independent rating, Mysoline scores higher — 3.7 vs 3.6 out of 5 for Terfonyl. Ratings are based on FDA regulatory (recall-safety) data.

What is the difference between Mysoline and Terfonyl?

Mysoline contains Primidone, while Terfonyl contains Trisulfapyrimidines (Sulfadiazine and Sulfamerazine and Sulfamethazine) — 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.