CALAN SR vs SDAMLO

Independent side-by-side comparison.

Rated against independent regulatory sources·Last updated August 21, 2026·How we rate

Possible drug interaction. CALAN SR and SDAMLO 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	SDAMLO
Rating	64/100	New
Pharmacy pays	~$5.71 /30	~$0.33 /30
Type	RX	RX
Active ingredient	VERAPAMIL HYDROCHLORIDE	AMLODIPINE BESYLATE
Manufacturer	Pfizer	Brillian Pharma
Dosage forms	Tablet, extended release	Solution
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 30 to 50 hours
Treats	Variant Angina Pectoris, Atrial Fibrillation, Atrial Flutter	Variant Angina Pectoris, Coronary Artery Disease, Hypertension

calan sr sdamlo

Rating

64/100

New

Pharmacy pays

~$5.71 /30

~$0.33 /30

Type

Active ingredient

VERAPAMIL HYDROCHLORIDE

AMLODIPINE BESYLATE

Manufacturer

Pfizer

Brillian Pharma

Dosage forms

Tablet, extended release

Solution

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 30 to 50 hours

Treats

Variant Angina Pectoris, Atrial Fibrillation, Atrial Flutter

Variant Angina Pectoris, Coronary Artery Disease, Hypertension

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Frequently asked questions

Which is cheaper, Calan SR or Sdamlo?

Sdamlo costs pharmacies less to acquire — about $0.33 vs $5.71 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 Sdamlo?

Calan SR contains Verapamil Hydrochloride, while Sdamlo contains Amlodipine Besylate — 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.