Get a Calan SR (Verapamil ER SR) prescription online

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Calan SR is a brand version of Verapamil ER. It’s used to treat high blood pressure (hypertension). This medication is a calcium channel blocker that only needs to be taken once a day.

Please note: At this time, this medication is only prescribed as a refill at Dr. B.

* Prescription treatment requires a virtual medical consultation with a medical provider to determine if a prescription is appropriate.

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How Dr. B treats high blood pressure

Health assessment

Tell us about your condition with a $15 online consultation—no video call necessary.

Provider review

A medical provider will review your information and prescribe treatment, if appropriate.

Get your medication

Pick up and pay for the medication at the pharmacy of your choice. Or, get it delivered.

About Calan SR (Verapamil ER SR)

How does it work?

Calan SR is a calcium channel blocker. This type of medicine relaxes blood vessels so the heart gets more oxygen and blood. It also slows down heart rate. As a result, the heart doesn’t have to work as hard and blood pressure goes down.

What does it treat?

Calan SR is prescribed for people with high blood pressure (hypertension).

What forms does it come in?

Calan SR comes as a tablet. Other brands or generic forms of Verapamil ER may come as a tablet or capsule, so check with your licensed provider before starting this hypertension medicine.

Calan SR vs. Verapamil ER SR

Calan SR and Verapamil ER SR are the same medication. Calan SR is the brand name for the medication. They both contain the same active ingredient that helps treat high blood pressure. Both are extended-release formulas that only need to be taken once daily.

How much will it cost?

Dr. B offers online consultations for $15—which is less than most copays. If a high blood pressure prescription is appropriate, your out-of-pocket medication cost will depend on your insurance and where you decide to get your prescription filled. With a drug discount card, prices for Verapamil ER120 mg (30 tablets) start at $3.35.

* Prices shown with drug discount card applied. Price may differ depending on location.

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Starting at

Verapamil ER120 mg (30 tablets)*

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Common Questions

Calan SR (Verapamil ER SR) prescription FAQ

What are the benefits of taking Calan SR (Verapamil ER SR)?
  • Treats high blood pressure (hypertension)
  • Reduces the risk of stroke and heart attack
  • Improves heart function
  • Protects the kidneys
  • Only needs to be take once daily
Who should not take this medication?
  • Those who are allergic to Verapamil
  • People with a known allergy or severe reaction to Calcium Channel Blockers (CCBs)
  • Pregnant women, breastfeeding or those planning to become pregnant
  • Those with a history of liver problems
  • People with severe heart conditions or heart failure
  • People who have slow heart rate (bradycardia) 
  • Those with low blood pressure (hypotension)
  • Those with myasthenia gravis (muscle disorder)
  • People with sick sinus syndrome (a heart rhythm problem)
  • Those who have second- or third-degree atrioventricular block (a heart rhythm problem)

If you have any of these conditions—or Raynaud's syndrome (a condition that causes the fingers and toes to become numb and cold), asthma, other respiratory issues, a history of significant lung diseases, porphyria (a rare blood disorder), kidney complications, or diabetes—speak with your healthcare provider before starting this medication. Also tell your medical provider about any other medications you’re using before you start this hypertension treatment.

Taking this medication when you have these conditions should be carefully and closely monitored by a healthcare provider.

Also, talk to your healthcare provider about limiting alcohol use. This medicine affects how alcohol is broken down in your body. If you drink alcohol, this can lead to longer lasting or more intense effects of alcohol.

How do you take this medication?

Take Calan SR once daily in the mornings, or as directed by your health provider. Other brands and generic versions of this medication may be taken differently. Check with your licensed provider to make sure you take this medicine correctly.

High blood pressure is a long-term (chronic) condition that can harm your organs. Medications for blood pressure are not a one-time cure. This medicine doesn't provide a complete cure for high blood pressure, so it's important to continue taking it, even if you start feeling better. If you stop taking it suddenly, this could cause dangerous problems, like heart attack or stroke. Follow your medical provider's instructions carefully.

What happens if I miss a dose?

Take this medicine exactly as prescribed. Taking too much of this medicine can cause dangerous side effects. Stopping this medicine could also cause your blood pressure to rise quickly. If you miss a dose, take it as soon as you can. If it’s almost time for the next dose, skip it. Don't take extra to catch up.

What happens if I take too much?

Taking too much of your blood pressure medicine can lead to symptoms like slow heart rate, low blood pressure and hyperglycemia (high blood sugar).

If you’ve taken too much Calan SR, call your medical provider or local poison control center (800-222-1222) immediately.

Can I get Calan SR (Verapamil ER SR) online?

Dr. B can help you get a refill for Calan SR and other hypertension medications. Just fill out a short health questionnaire to get started.

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Side Effects

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Calan SR can cause side effects for some people. The most common side effects are:

  • Dizziness
  • Nausea
  • Constipation
  • Low blood pressure
  • Swelling of arms, legs, hands or feet

Tell your health provider if your side effects bother you or if they get worse over time. Also, get help right away if you notice more serious side effects. This might include symptoms like chest pain, breathing problems, swelling of arms or legs, confusion or severe tiredness.

Don’t drive until you know how this medicine affects you. Be extra careful in the first hours after taking your pill because of the risk of dizziness or lightheadedness.

Getting your blood tested regularly is important to monitor your overall health. It's a good idea to have your bloodwork checked, which may include tests for renal function, glucose levels or potassium levels in your blood. These routine checks help ensure you are in good health and catch any potential issues early.