PRONESTYL vs QUINIDEX

Independent side-by-side comparison.

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

Possible drug interaction. PRONESTYL and QUINIDEX 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	PRONESTYL	QUINIDEX
Rating	New	New
Pharmacy pays	—	~$326.26 /30
Type	RX	RX
Active ingredient	PROCAINAMIDE HYDROCHLORIDE	QUINIDINE SULFATE
Manufacturer	Apothecon	Wyeth Pharms Inc
Dosage forms	Capsule, Tablet, Injectable	Tablet, extended release
Drug class	Antiarrhythmic	Antiarrhythmic
Boxed warning	None	None
Treats	Atrial Fibrillation, Atrial Flutter, Supraventricular Tachycardia	Atrial Fibrillation, Atrial Flutter

pronestyl quinidex

Rating

New

Pharmacy pays

—

~$326.26 /30

Type

Active ingredient

PROCAINAMIDE HYDROCHLORIDE

QUINIDINE SULFATE

Manufacturer

Apothecon

Wyeth Pharms Inc

Dosage forms

Capsule, Tablet, Injectable

Tablet, extended release

Drug class

Antiarrhythmic

Boxed warning

None

Treats

Atrial Fibrillation, Atrial Flutter, Supraventricular Tachycardia

Atrial Fibrillation, Atrial Flutter

Frequently asked questions

What is the difference between Pronestyl and Quinidex?

Pronestyl contains Procainamide Hydrochloride, while Quinidex contains Quinidine Sulfate — 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.