Comparing Calan vs Calan SR

View side-by-side comparisons of medication uses, ratings, cost, side effects and interactions.
Calan (verapamil)	Calan SR (verapamil)	Enter another drug to compare

View side-by-side comparisons of medication uses, ratings, cost, side effects and interactions.
Calan (verapamil)	Calan SR (verapamil)	Enter another drug to compare
Prescription only Prescribed for Arrhythmia, Angina, High Blood Pressure. Calan may also be used for purposes not listed in this medication guide.	Prescription only Prescribed for High Blood Pressure. Calan SR may also be used for purposes not listed in this medication guide.	Related suggestions High Blood Pressure (Hypertension) Lisinopril Amlodipine Losartan Hydrochlorothiazide Metoprolol Atenolol
More about Calan (verapamil)	More about Calan SR (verapamil)
Ratings & Reviews
Calan has an average rating of 10.0 out of 10 from a total of 4 ratings on Drugs.com. 100% of reviewers reported a positive effect, while 0% reported a negative effect.	Calan SR has an average rating of 8.6 out of 10 from a total of 10 ratings on Drugs.com. 70% of reviewers reported a positive effect, while 0% reported a negative effect.
View all 4 reviews	View all 10 reviews
Side Effects Experienced by Users Side effects are reported in Drugs.com user reviews and not clinically verified.
View all Calan side effects	View all Calan SR side effects
Drug Class
Calcium channel blockers Group IV antiarrhythmics	Calcium channel blockers Group IV antiarrhythmics
Generic Availability
Lower cost generic approved	Lower cost generic approved
Pricing and Coupons * Prices are without insurance
We could not find an exact match for this medicine. Try searching the Price Guide directly.	We could not find an exact match for this medicine. Try searching the Price Guide directly.
Get free Discount Card	Get free Discount Card

Dosage Forms
Oral tablet	Oral tablet, extended release
Brand Names
Other verapamil brands include: Calan SR, Verelan, Verelan PM	Other verapamil brands include: Verelan, Verelan PM
Half Life Drug half-life is the time required for plasma concentration to reduce to half its original value.
12 hours	12 hours
CSA Schedule ¹ View glossary of CSA terms
N Not a controlled drug Is not subject to the Controlled Substances Act.	N Not a controlled drug Is not subject to the Controlled Substances Act.
Pregnancy Category
C Category C Risk cannot be ruled out See the full pregnancy warnings document.	C Category C Risk cannot be ruled out See the full pregnancy warnings document.
Drug Interactions
A total of 663 drugs are known to interact with Calan: 129 major drug interactions (405 brand and generic names) 484 moderate drug interactions (3088 brand and generic names) 50 minor drug interactions (121 brand and generic names)	A total of 663 drugs are known to interact with Calan SR: 129 major drug interactions (405 brand and generic names) 484 moderate drug interactions (3088 brand and generic names) 50 minor drug interactions (121 brand and generic names)
Alcohol/Food/Lifestyle Interactions
You may take verapamil with or without food, but take it the same way every time. You should avoid... View more Ask your doctor before using verapamil together with alcohol. Verapamil may increase the blood... View more	You may take verapamil with or without food, but take it the same way every time. You should avoid... View more Ask your doctor before using verapamil together with alcohol. Verapamil may increase the blood... View more
Disease Interactions
Aortic stenosis Bradyarrhythmia/AV block Cardiogenic shock/hypotension Coronary artery disease Liver disease Ventricular tachycardia Accessory AV tracts CHF/AMI Hypertrophic cardiomyopathy Neuromuscular transmission Renal dysfunction GI narrowing	Aortic stenosis Bradyarrhythmia/AV block Cardiogenic shock/hypotension Coronary artery disease Liver disease Ventricular tachycardia Accessory AV tracts CHF/AMI Hypertrophic cardiomyopathy Neuromuscular transmission Renal dysfunction GI narrowing
First Approval Date
September 10, 1984	December 16, 1986
WADA Class View classifications
N/A	N/A
More Information
Side effects Drug interactions Dosage Pregnancy warnings Breastfeeding warnings Drug images	Side effects Drug interactions Dosage Pregnancy warnings Breastfeeding warnings Drug images
Patient Resources
Calan uses Advanced reading	Calan SR uses Advanced reading
Professional Resources
Prescribing information	Prescribing information
Related Treatment Guide
Arrhythmia Angina High Blood Pressure	High Blood Pressure

¹ The Controlled Substances Act (CSA) schedule information displayed applies to substances regulated under federal law. There may be variations in CSA schedules between individual states.

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Comparing Calan vs Calan SR

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