CALAN vs CALAN SR

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 22, 2026·How we rate

Attribute	CALAN	CALAN SR
Rating	New	64/100
Pharmacy pays	~$5.71 /30	~$5.71 /30
Type	RX	RX
Active ingredient	VERAPAMIL HYDROCHLORIDE	VERAPAMIL HYDROCHLORIDE
Manufacturer	Gd Searle LLC	Pfizer
Dosage forms	Tablet	Tablet, extended release
Drug class	Calcium Channel Blocker	Calcium Channel Blocker
Boxed warning	None	None
Half-life	about 2.8 to 7.4 hours after a single dose, rising to about 4.5 to 12 hours with repeated dosing	about 2.8 to 7.4 hours after a single dose, rising to about 4.5 to 12 hours with repeated dosing
Treats	Variant Angina Pectoris, Atrial Fibrillation, Atrial Flutter	Variant Angina Pectoris, Atrial Fibrillation, Atrial Flutter

calan calan sr

Rating

New

64/100

Pharmacy pays

~$5.71 /30

Type

Active ingredient

VERAPAMIL HYDROCHLORIDE

Manufacturer

Gd Searle LLC

Pfizer

Dosage forms

Tablet

Tablet, extended release

Drug class

Calcium Channel Blocker

Boxed warning

None

Half-life

about 2.8 to 7.4 hours after a single dose, rising to about 4.5 to 12 hours with repeated dosing

Treats

Variant Angina Pectoris, Atrial Fibrillation, Atrial Flutter

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Frequently asked questions

Which is cheaper, Calan or Calan SR?

Pharmacies pay about the same to acquire either one — roughly $5.71 for a 30-count supply, per the CMS NADAC survey. That is not what you will be charged: your price is set by your insurer and the pharmacy, not by what the drug cost them.

What is the difference between Calan and Calan SR?

Both Calan and Calan SR share the active ingredient Verapamil Hydrochloride.

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.