CALAN SR vs DILACOR XR

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 16, 2026·How we rate

Possible drug interaction. CALAN SR and DILACOR 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	CALAN SR	DILACOR XR
Rating	64/100	72/100
Pharmacy pays	~$5.71 /30	~$9.18 /30
Type	RX	RX
Active ingredient	VERAPAMIL HYDROCHLORIDE	DILTIAZEM HYDROCHLORIDE
Manufacturer	Pfizer	Allergan
Dosage forms	Tablet, extended release	Capsule, 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 3 to 4.5 hours
Treats	Variant Angina Pectoris, Atrial Fibrillation, Atrial Flutter	Variant Angina Pectoris, Atrial Fibrillation, Atrial Flutter

calan sr dilacor xr

Rating

64/100

72/100

Pharmacy pays

~$5.71 /30

~$9.18 /30

Type

Active ingredient

VERAPAMIL HYDROCHLORIDE

DILTIAZEM HYDROCHLORIDE

Manufacturer

Pfizer

Allergan

Dosage forms

Tablet, extended release

Capsule, 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

about 3 to 4.5 hours

Treats

Variant Angina Pectoris, Atrial Fibrillation, Atrial Flutter

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Frequently asked questions

Which is better-rated, Calan SR or Dilacor XR?

By our independent rating, Dilacor XR scores higher — 3.6 vs 3.2 out of 5 for Calan SR. Ratings are based on FDA regulatory (recall-safety) data.

Which is cheaper, Calan SR or Dilacor XR?

Calan SR costs pharmacies less to acquire — about $5.71 vs $9.18 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 Calan SR and Dilacor XR?

Calan SR contains Verapamil Hydrochloride, while Dilacor XR contains Diltiazem 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.