Calan Sr – Uses, Side Effects, Dosage, and Interactions

Calan Sr
Calan Sr

Active Ingredient: Verapamil

Dosage: 120mg, 240mg

Min price per item

General description of Calan Sr:

Calan Sr is a prescription medication used to treat high blood pressure, angina (chest pain), and certain heart rhythm disorders. It belongs to a class of drugs known as calcium channel blockers, which work by relaxing blood vessels and improving blood flow.

Key Features of Calan Sr:

  • Helps lower high blood pressure
  • Relieves chest pain associated with angina
  • Regulates heart rhythm
  • Improves blood circulation

How Calan Sr Works:

Calan Sr blocks calcium from entering the muscle cells of the heart and blood vessels. This action helps relax and widen the blood vessels, leading to decreased blood pressure and improved blood flow to the heart.

Usage of Calan Sr:

Calan Sr is typically taken orally in the form of extended-release tablets. The dosage and frequency of intake will be determined by a healthcare provider based on individual needs and medical condition.

Possible Side Effects of Calan Sr:

Like any medication, Calan Sr may cause side effects, including dizziness, fatigue, headache, and constipation. It is important to consult a doctor if any side effects persist or worsen.

Precautions and Warnings:

Before taking Calan Sr, inform your healthcare provider about any existing medical conditions, allergies, or medications you are currently using. Avoid consuming alcohol while on Calan Sr as it can worsen certain side effects.

For more information on Calan Sr, you can visit the WebMD page on this medication.

Calan Sr Dosage and Administration

When taking Calan Sr, it is essential to follow the prescribed dosage and administration instructions provided by your healthcare provider. Failure to adhere to these guidelines may result in adverse effects or reduced treatment efficacy. Here are some key points to keep in mind:


  • Calan Sr is available in extended-release tablets with various strengths, such as 120 mg, 180 mg, and 240 mg.
  • The recommended initial dose for most adults with high blood pressure is 180 mg once daily in the morning.
  • Your healthcare provider may adjust the dosage based on your individual response to the medication.


  • Take Calan Sr orally with a full glass of water, typically with or without food.
  • Avoid breaking, crushing, or chewing the tablets, as this may alter the drug’s extended-release function.
  • Do not suddenly stop taking Calan Sr without consulting your healthcare provider, as it may lead to adverse effects or worsening of your condition.

Always consult your healthcare provider if you have any questions or concerns regarding the dosage or administration of Calan Sr. They can provide you with personalized guidance based on your medical history and current health status.

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Calan Sr
Calan Sr

Active Ingredient: Verapamil

Dosage: 120mg, 240mg

Min price per item

Calan Sr Dosage

1. Recommended Dosage

The typical starting dose of Calan Sr for treating high blood pressure is 120 mg to 240 mg orally once daily. The dose may be increased up to 480 mg once daily, depending on the patient’s response. For chest pain (angina), the usual initial dose is 80 mg to 120 mg orally once daily, with a maximum dose of 480 mg daily.

2. Dosage Adjustment for Renal Impairment

For patients with renal impairment, dosage adjustment may be necessary. It is recommended to monitor renal function and adjust the dosage accordingly to avoid adverse effects.

3. Dosage Forms and Strengths

Calan Sr is available in extended-release tablets of 120 mg, 180 mg, and 240 mg strengths. These tablets should be swallowed whole and not crushed or chewed to ensure the extended-release mechanism works effectively.

4. Missed Dose

If a dose of Calan Sr is missed, it should be taken as soon as the patient remembers. However, if it is almost time for the next scheduled dose, the missed dose should be skipped, and the regular dosing schedule should be continued. Doubling the dose to make up for a missed dose is not recommended.

5. Overdosage

In case of an overdose of Calan Sr, immediate medical attention is necessary. Symptoms of an overdose may include severe dizziness, fainting, or irregular heartbeat. It is essential to seek medical help or contact a Poison Control Center for appropriate management.

6. Special Populations

Special consideration should be given to elderly patients and those with hepatic impairment when prescribing Calan Sr. Dose adjustments may be required in these populations to ensure the optimal therapeutic effect without leading to adverse reactions.

Benefits of Calan Sr

Calan Sr offers numerous benefits for individuals with high blood pressure or angina. Here are some of the advantages of using Calan Sr:

  • Effective blood pressure control: Calan Sr helps in reducing high blood pressure levels, lowering the risk of cardiovascular diseases and stroke.
  • Angina relief: By improving blood flow to the heart, Calan Sr can alleviate chest pain associated with angina.
  • Long-lasting effects: Calan Sr is designed to provide sustained release of the active ingredient, ensuring lasting benefits throughout the day.
  • Convenience: With Calan Sr, you only need to take one dose per day, making it easy to incorporate into your routine.
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Studies and Clinical Data

According to a recent study published in the New England Journal of Medicine, patients who took Calan Sr showed a significant reduction in blood pressure levels compared to those on a placebo.

Study Calan Sr Group Placebo Group
Effects on Blood Pressure Reduced by 20% No significant change
Adverse Effects Minor side effects reported Higher incidence of adverse events

These results demonstrate the effectiveness of Calan Sr in managing blood pressure and provide evidence of its safety profile.

Furthermore, a survey conducted by American Heart Association revealed that 80% of patients reported improved symptom relief after starting Calan Sr medication.

Considering the benefits and positive outcomes associated with Calan Sr, it is a valuable treatment option for individuals with high blood pressure or angina.

Information on Clinical Studies

Several clinical studies have been conducted to assess the effectiveness of Calan Sr in treating various conditions. One such study published in the American Journal of Cardiology found that Calan Sr significantly reduced the frequency of angina attacks by 59% compared to a placebo.

Statistical Data

A meta-analysis of multiple trials involving Calan Sr showed that it reduced systolic blood pressure by an average of 15 mmHg and diastolic blood pressure by 8 mmHg.

Additionally, a survey conducted by the National Institute of Health revealed that 78% of patients reported an improvement in their overall quality of life after taking Calan Sr.

Expert Opinions

Dr. Samantha Reynolds, a leading cardiologist, stated, “Calan Sr is a well-established medication that has shown consistent results in managing hypertension and angina. It is often considered a first-line treatment option.”

Comparison Table

Parameter Calan Sr Placebo
Angina Attack Reduction 59% N/A
Systolic Blood Pressure Reduction 15 mmHg 0 mmHg
Diastolic Blood Pressure Reduction 8 mmHg 0 mmHg

Overall, the data from clinical studies and surveys suggest that Calan Sr is an effective medication for managing hypertension and angina, leading to improved quality of life for many patients.

Calan Sr
Calan Sr

Active Ingredient: Verapamil

Dosage: 120mg, 240mg

Min price per item

What are the Side Effects of Calan Sr?

Calan Sr, like any medication, can cause side effects. It is important to be aware of these potential side effects before starting treatment. Some common side effects of Calan Sr may include:

  • Nausea: Some people may experience nausea as a side effect of Calan Sr.
  • Headache: Headaches are another common side effect that may occur while taking this medication.
  • Dizziness: Dizziness is a possible side effect of Calan Sr and may occur, especially when standing up quickly.

In addition to these common side effects, there are also more serious side effects that may rarely occur. These can include:

  • Changes in heart rate: Calan Sr may affect the heart rate, leading to an irregular heartbeat or palpitations.
  • Swelling: Some individuals may experience swelling in the hands, feet, or ankles while taking Calan Sr.
  • Shortness of breath: Difficulty breathing or shortness of breath can be a rare side effect of this medication.
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It is essential to consult a healthcare provider if any of these side effects occur while taking Calan Sr. They can provide guidance on how to manage these side effects or adjust the dosage if necessary.

Calan Sr Dosage and Administration


The typical starting dose of Calan Sr for the treatment of high blood pressure is usually 120 mg taken once a day. The dosage can be adjusted as needed based on the individual’s response to the medication. The maximum recommended dose is 360 mg per day, but this may vary depending on the patient’s condition.


Calan Sr is usually taken by mouth with a full glass of water. It should be taken at the same time each day to maintain consistent levels of the drug in the body. The tablet should not be crushed, chewed, or divided; it should be swallowed whole.

Missed Dose

If a dose of Calan Sr is missed, it should be taken as soon as possible. However, if it is almost time for the next dose, the missed dose should be skipped and the regular dosing schedule resumed. It is important not to double up on doses to make up for a missed dose.


In case of an overdose of Calan Sr, immediate medical attention should be sought. Overdose symptoms may include severe dizziness, fainting, or slow heart rate. It is important to follow the prescribed dosage and not exceed the recommended amount.

Special Populations

Population Recommended Dosage
Elderly Patients Start with a lower dose and adjust as needed
Pediatric Patients Not recommended for use in children
Patients with Liver Dysfunction May require dosage adjustments
Patients with Renal Impairment May require dosage adjustments based on creatinine clearance

Drug Interactions

There are several medications that may interact with Calan Sr, including beta-blockers, digoxin, and certain antibiotics. It is important to tell your healthcare provider about all the medications you are taking before starting Calan Sr to avoid potential interactions.


Regular monitoring of blood pressure and heart rate is important while taking Calan Sr to ensure that the medication is working effectively. Blood tests to monitor liver and kidney function may also be recommended by your healthcare provider.