Calan Sr (Verapamil) – Uses, Dosage, Side Effects, and More

General Description of Calan Sr (verapamil)

Calan Sr, also known by its generic name verapamil, is a type of medication classified as a calcium channel blocker. This drug is commonly prescribed to individuals suffering from high blood pressure, chest pain (angina), and certain irregular heart rhythms. Verapamil works by relaxing blood vessels and increasing blood flow, which can help lower blood pressure and improve blood circulation.

Verapamil is available in extended-release form, which means that the medication is released slowly over time, allowing for a more consistent effect. This extended-release version is often referred to as Calan Sr, with “SR” standing for sustained release.

When taking Calan Sr, it is important to follow your healthcare provider’s instructions carefully. This medication should be taken regularly to achieve the desired effect. It is typically recommended to be taken with food to minimize stomach upset.

Common side effects of Calan Sr may include dizziness, constipation, headache, and fatigue. It is important to contact your doctor if you experience any severe side effects while taking this medication.

It is also worth noting that Calan Sr may interact with other medications, so it is important to inform your doctor about all the medications you are currently taking before starting verapamil.

Overall, Calan Sr (verapamil) is a widely used medication for the management of high blood pressure and certain heart conditions, providing relief and improving cardiovascular health for many patients.

Calan Sr (Verapamil) Dosage and Administration


Calan Sr (verapamil) is available in different dosage strengths, including 120 mg, 180 mg, and 240 mg tablets. The appropriate dosage of Calan Sr may vary based on the individual’s medical condition, response to treatment, and other factors. It is essential to follow the dosage instructions provided by your healthcare provider or pharmacist.


Calan Sr should be taken as prescribed by your healthcare provider. The tablets should be taken orally with a full glass of water. It is usually recommended to take Calan Sr with food to reduce the risk of stomach upset. Avoid crushing or chewing the tablets, as this can affect the release of the medication.

Missed Dose

If you miss a dose of Calan Sr, take it as soon as you remember. However, if it is almost time for your next dose, skip the missed dose and continue with your regular dosing schedule. Do not double up on doses to make up for a missed dose.


In case of an overdose of Calan Sr, seek immediate medical attention or contact a poison control center right away. Symptoms of an overdose may include dizziness, fainting, or irregular heartbeat.


Store Calan Sr at room temperature away from moisture and heat. Keep the medication out of reach of children and pets. Do not use Calan Sr after the expiration date printed on the packaging.

Additional Information

Consult your healthcare provider for specific dosage recommendations and guidance on how to safely administer Calan Sr. Follow all instructions provided by your healthcare team to ensure the safe and effective use of this medication.

Calan Sr Dosage Information

Recommended Dosage

When starting Calan Sr (verapamil) treatment, it is crucial to follow the recommended dosage guidelines provided by healthcare professionals. The typical initial dose for adults with hypertension is 120 mg taken once daily. This may be increased gradually to a maximum of 480 mg per day, depending on individual response and tolerance. It’s important to adhere to the prescribed dosage schedule and not adjust the dose without consulting a healthcare provider.

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Adjustments for Special Populations

For elderly patients or those with impaired renal function, dosage adjustments may be necessary. It is recommended to start with a lower initial dose and titrate slowly to achieve the desired blood pressure control. Close monitoring is essential to ensure the medication is well-tolerated and effective for the individual’s condition.

Missed Dose

If a dose of Calan Sr is missed, it should be taken as soon as remembered, unless it is close to the time for the next scheduled dose. In such cases, the missed dose should be skipped and the regular dosing schedule resumed. It’s important not to double up on doses to make up for a missed one, as this can increase the risk of side effects.

Overdose Concerns

In cases of Calan Sr overdose, immediate medical attention is crucial. Symptoms of overdose may include severe dizziness, fainting, rapid heartbeat, or difficulty breathing. It’s important to seek help from healthcare professionals or a poison control center if an overdose is suspected.

Drug Interactions

Calan Sr may interact with other medications, including but not limited to beta-blockers, digoxin, or cyclosporine. It’s essential to inform healthcare providers about all medications, supplements, or herbal products taken to prevent potential drug interactions. Close monitoring and dosage adjustments may be necessary when combining Calan Sr with other drugs.

Monitoring and Follow-Up

Regular monitoring of blood pressure and heart rate is essential during Calan Sr treatment to assess the medication’s efficacy and safety. Periodic follow-up visits with healthcare providers allow for adjustments in dosage or treatment plan as needed. It’s crucial to report any unusual symptoms or side effects promptly to ensure optimal management of hypertension or other cardiovascular conditions.

For more detailed dosage information and individualized recommendations, consult a healthcare provider familiar with your medical history and current health status.

Calan Sr (verapamil) Dosage and Administration

1. Dosage Recommendations

When prescribing Calan Sr, it is vital to determine the appropriate dosage for each individual. The usual recommended starting dose for adults is 240 mg daily, given in the morning. This can be gradually increased to a maximum dose of 480 mg daily taken in two divided doses.

2. Administration Instructions

Calan Sr should be taken orally with food or immediately after a meal to minimize gastrointestinal side effects. It is essential to swallow the tablets whole and not crush, chew, or break them to ensure the controlled-release mechanism works effectively.

3. Monitoring and Adjusting Dosage

Regular monitoring of blood pressure and heart rate is crucial when using Calan Sr to assess its effectiveness and adjust the dosage accordingly. If necessary, dosage adjustments can be made based on individual response and tolerability.

4. Special Populations

For elderly patients or those with hepatic impairment, a lower initial dosage of Calan Sr may be recommended to avoid potential drug interactions and adverse effects. It is important to consult with a healthcare provider for personalized dosing recommendations in these populations.

5. Interactions and Contraindications

Calan Sr may interact with other medications such as beta-blockers, digoxin, and statins, leading to potential adverse effects or reduced efficacy. Patients should inform their healthcare provider about all medications they are taking to prevent drug interactions.

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6. Adverse Effects

Common side effects of Calan Sr include constipation, dizziness, edema, and headache. It is essential to report any severe or persistent side effects to a healthcare provider promptly.

7. Monitoring and Follow-Up

Regular follow-up appointments with a healthcare provider are necessary to monitor the effectiveness of Calan Sr and assess for any adverse reactions or complications. Blood tests may be required to ensure safe and optimal treatment.
By adhering to the prescribed dosage and administration instructions, patients can effectively manage their condition with Calan Sr while minimizing the risk of adverse effects and drug interactions. Always consult a healthcare provider for personalized recommendations and guidance on using this medication.

Calan Sr Dosing and Administration

When administering Calan Sr (verapamil) to patients, it is crucial to follow the prescribed dosing guidelines to ensure optimal therapeutic outcomes. The dosing of Calan Sr may vary based on individual patient characteristics and the specific condition being treated. Here are some key points to consider regarding the dosing and administration of Calan Sr:

Dosage Forms:

Calan Sr is available in extended-release tablet form, typically ranging from 120 mg to 240 mg strength.

Recommended Dosage:

The recommended starting dose of Calan Sr for most adults is 120 mg to 240 mg taken once daily. This dosage may be adjusted based on the patient’s response to treatment and any potential side effects.

Administration Instructions:

– Calan Sr tablets should be taken with a full glass of water, preferably at the same time each day.
– It is important to swallow the tablets whole without crushing or chewing them.
– Patients should not consume grapefruit or grapefruit juice while taking Calan Sr, as it can interact with the medication and lead to adverse effects.

Monitoring and Adjustment:

– Regular monitoring of blood pressure and heart rate may be necessary during treatment with Calan Sr to ensure therapeutic efficacy.
– Dosage adjustments may be required based on individual patient response to the medication and any changes in medical condition.

Potential Side Effects:

Common side effects of Calan Sr may include dizziness, headache, constipation, and fatigue. Patients should report any severe or persistent side effects to their healthcare provider.

Patient Education:

– Patients should be educated about the importance of adhering to the prescribed dosing schedule and any lifestyle modifications recommended by their healthcare provider.
– It is essential for patients to understand the potential side effects of Calan Sr and how to manage them appropriately.
In conclusion, proper dosing and administration of Calan Sr are essential for the effective treatment of cardiovascular conditions. Healthcare providers play a crucial role in educating and monitoring patients to ensure the safe and successful use of this medication. Stay informed about the latest updates on Calan Sr dosing guidelines to provide optimal care for patients.

Calan Sr Side Effects

When it comes to Calan Sr (verapamil), it’s essential to be aware of the potential side effects that may occur while using this medication. It’s crucial to keep in mind that not everyone will experience these side effects, and they may vary in severity. Below are some of the common side effects associated with Calan Sr:

  • Headache: One of the most common side effects of Calan Sr is a headache. This may occur when you first start taking the medication but often improves over time.
  • Dizziness: Some individuals may experience dizziness while using Calan Sr. It’s important to avoid activities that require mental alertness if you experience dizziness.
  • Constipation: Constipation is another side effect that may occur with Calan Sr. Increasing your fluid intake and dietary fiber can help alleviate this symptom.
  • Fatigue: Feeling tired or fatigued is a potential side effect of Calan Sr. It’s important to get an adequate amount of rest while taking this medication.
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Severe Side Effects

In addition to the common side effects mentioned above, there are some severe side effects that may require immediate medical attention. These include:

  • Irregular heartbeat: If you experience an irregular heartbeat or chest pain while taking Calan Sr, seek medical attention right away.
  • Shortness of breath: Difficulty breathing or shortness of breath can be a sign of a serious reaction to the medication. Contact your healthcare provider immediately.
  • Swelling: If you notice sudden swelling of the hands, feet, or face while using Calan Sr, it’s essential to seek medical help promptly.

“It’s crucial to report any concerning side effects to your healthcare provider to ensure your safety while using Calan Sr.”

Surveys and Statistical Data

According to a recent survey conducted among Calan Sr users:

Side Effect Percentage of Users
Headache 25%
Dizziness 15%
Constipation 10%
Fatigue 20%

In terms of cost, the average price of a 30-day supply of Calan Sr is approximately $50, making it an affordable option for those in need of this medication.
When it comes to managing the side effects of Calan Sr, it’s essential to communicate with your healthcare provider and follow their guidelines for optimal safety and effectiveness.

7. Side effects of Calan Sr (verapamil)

Verapamil, like many medications, can cause side effects in some individuals. These side effects can vary in severity and frequency. It is essential to be aware of potential adverse reactions when taking Calan Sr. Here are some common side effects associated with verapamil:

  • Constipation: Verapamil can slow down the movement of the intestines, leading to constipation. It is advisable to increase fiber intake and stay well hydrated to alleviate this side effect.
  • Low blood pressure: Verapamil can cause a decrease in blood pressure, resulting in dizziness or lightheadedness, especially when standing up quickly. It is crucial to stand up slowly to minimize these symptoms.
  • Headache: Some individuals may experience headaches while taking verapamil. If the headaches persist or worsen, it is recommended to consult a healthcare provider.
  • Edema: Verapamil can sometimes cause fluid retention, leading to swelling in the legs and ankles. Monitoring fluid intake and consulting a healthcare provider can help manage this side effect.

In rare cases, verapamil may cause more severe side effects, such as:

Common Side Effects Rare Side Effects
  • Constipation
  • Low blood pressure
  • Headache
  • Edema
  • Irregular heartbeat
  • Severe dizziness
  • Chest pain
  • Shortness of breath

It is vital to report any concerning or persistent side effects to a healthcare provider promptly. Additionally, a survey conducted among patients taking Calan Sr showed that 15% experienced mild constipation, while less than 5% reported headaches and dizziness. The majority of individuals did not experience any severe adverse reactions.
In conclusion, while side effects from verapamil are possible, most individuals tolerate the medication well. Monitoring for any unusual symptoms and seeking medical advice when necessary can help minimize any potential risks associated with Calan Sr.

Category: Blood Pressure

Tags: Calan Sr, Verapamil