What is Calan?
Calan is a calcium channel blocker that contains the active ingredient verapamil.
This treatment works by relaxing and widening blood vessels, which are the tubes that carry blood around the body. When these vessels relax, blood flows more easily, and the heart does not have to work as hard.
It also helps control the electrical signals in the heart. These signals are what tell the heart when to beat. By slowing these signals, Calan can help manage fast or irregular heartbeat conditions.
- Calan is used for high blood pressure treatment
- It is also used for chest pain relief linked to heart disease
- It helps control irregular heart rhythm, such as atrial fibrillation
This makes Calan a widely used option for people looking for verapamil for hypertension, verapamil for heart rate control, and Calan SR blood pressure tablets.
Indications and Benefits of Calan
Calan is prescribed for several heart and blood vessel conditions. These are often searched as Calan uses, verapamil indications, and Calan for heart conditions.
It is commonly used for:
- High blood pressure (hypertension): This means the force of blood against the vessel walls is too high. Calan helps lower this pressure to reduce strain on the heart.
- Chest pain (angina): This type of pain happens when the heart does not get enough oxygen-rich blood. Calan improves blood flow to help reduce these episodes.
- Fast or irregular heartbeat (arrhythmia): Conditions like atrial fibrillation cause the heart to beat too quickly or unevenly. Calan helps slow and stabilize the heart rate.
By treating these conditions, Calan helps lower the risk of serious complications such as:
- Heart attack
- Stroke
- Kidney damage
What Are the Benefits of Calan?
- Calan helps lower high blood pressure in a steady and controlled way, which reduces the risk of stroke and heart problems over time.
- Calan improves blood flow by relaxing blood vessels, allowing blood to move more easily throughout the body.
- Calan helps reduce chest pain episodes by increasing the amount of oxygen-rich blood that reaches the heart.
- Calan supports a more regular heartbeat by slowing down abnormal electrical signals in the heart.
- Calan reduces the workload of the heart, helping it pump more efficiently and with less strain.
- Calan helps protect important organs such as the heart, brain, and kidneys from damage linked to high blood pressure.
Fact Table
| Fact Category | Fact Details |
| Generic Name | Verapamil hydrochloride |
| Calan Class | A calcium channel blocker that relaxes blood vessels and helps control heart rhythm |
| Primary Use | Used for high blood pressure, chest pain, and certain heart rhythm disorders |
| Additional Benefit | Helps improve blood flow and reduce the risk of heart attack and stroke |
| Available Form | Sustained-release tablets such as Calan SR, as well as the intravenous form, are used in hospital settings |
| Method of Administration | Taken by mouth for tablets or given through intravenous injection in a monitored setting |
| Frequency | Usually taken once daily for sustained-release tablets, depending on the prescribed dose |
| Dosage Strength | Common strengths include 180 mg, 240 mg, and 360 mg sustained-release tablets |
| Bioavailability | About 20 to 35 percent of the dose reaches the bloodstream after oral use |
| Elimination Half Life | Around 4.5 to 12 hours, with sustained-release forms lasting longer in the body |
| Protein Binding | About 90 percent, meaning most of the drug binds to proteins in the blood |
| Routes of Administration | Oral tablets for regular use and intravenous form for hospital use |
| Storage Instructions | Store at room temperature away from heat, moisture, and direct light |
| Legal Status | Prescription only, which means a valid prescription is required |
| Pregnancy and Breastfeeding | Pregnancy Category C, which means risk cannot be ruled out, and should be used with medical guidance, especially during breastfeeding |
| Drug Interactions | May interact with beta blockers, digoxin, certain antibiotics, and other treatments that affect heart rate or blood pressure |
| Brands | Calan SR, Isoptin SR, Verelan, and Covera-HS |
| Manufacturer | Manufactured by Searle Pharmaceuticals, with labeling associated with Pfizer, and other manufacturers produce generic versions |
How It Works
Calan works by blocking calcium from entering certain cells in the heart and blood vessels. Calcium is a mineral that helps muscles tighten and contract. When too much calcium enters these cells, the blood vessels become narrow, and the heart may beat faster or harder than normal.
Calan slows this process by limiting calcium entry, which helps the blood vessels relax and widen. This allows blood to flow more easily and lowers blood pressure.
In the heart, Calan also slows down the electrical signals that control the heartbeat. These signals tell the heart when to beat.
By slowing them down, Calan helps control fast or irregular heart rhythms and keeps the heartbeat more stable. Overall, this action reduces the workload on the heart, improves oxygen supply, and supports better heart function.
Dosage
Calan dosage depends on the condition being treated, the form used, and how the body responds to treatment. Calan SR is commonly prescribed as an extended-release tablet, which means it slowly releases the active ingredient over time to provide steady control of blood pressure and heart rate.
For most patients using Calan SR tablets, it is taken by mouth once daily. It should be swallowed whole with water and taken at the same time each day to maintain a consistent level in the body. The tablet should not be crushed or chewed, as this can affect how the drug is released.
In hospital settings, intravenous verapamil may be used for fast-acting heart rate control. This form is given slowly through a vein under close monitoring of heart rhythm and blood pressure.
Do not stop taking Calan suddenly, as this may worsen blood pressure or heart symptoms.
What Dosage Strengths Does Calan Come In?
Calan is available in different strengths depending on the formulation. These are often searched as Calan SR dosage, verapamil SR strengths, and verapamil dosage for hypertension.
- Calan SR sustained-release tablets are commonly available in 120 mg, 180 mg, 240 mg, and 360 mg strengths
- Intravenous Calan is available in 5 mg and 10 mg doses for hospital use
The exact strength prescribed depends on the condition, severity, and patient response.
Dosage Chart
| Patient Type | Recommended Dose | Notes |
| Adults oral SR tablets | Usually, once daily, based on 120 mg to 360 mg | Dose is adjusted based on blood pressure or heart rate response |
| Adults intravenous use | Initial dose 5 to 10 mg given slowly over at least 2 minutes | May repeat 10 mg after 30 minutes if needed under monitoring |
| Older adults | Lower starting dose with slower administration | Given over at least 3 minutes to reduce the risk of side effects |
| Children 0 to 1 year | 0.1 to 0.2 mg per kg body weight | Given by the intravenous route under strict monitoring |
| Children 1 to 15 years | 0.1 to 0.3 mg per kg body weight | The single dose should not exceed 5 mg |
Usage Guide
Calan SR is taken by mouth, usually with food, to help improve absorption and reduce stomach discomfort.
The tablet should be swallowed whole with a full glass of water. Do not crush, chew, or break the tablet, as this can affect how the extended release system works and may release too much of the drug at once.
Most adults are started on a dose of 180 mg once daily, often taken in the morning. Some patients, such as older adults or those with lower body weight, may begin with 120 mg daily.
Based on how the body responds, the dose may be increased to 240 mg or 360 mg per day if needed.
To get the best results, take Calan at the same time each day. This helps keep the level steady in the bloodstream and improves blood pressure and heart rate control.
Do not take more than the prescribed amount, and do not stop taking it suddenly without medical advice, as this may cause symptoms to worsen.
How do you take Calan?
- Take Calan by mouth with food to help with absorption and reduce stomach upset.
- Swallow the tablet whole with water and avoid crushing or chewing it.
- Take the dose at the same time each day to maintain a steady effect.
- Follow the exact dose prescribed, which may start at 120 mg or 180 mg and increase if needed.
- Do not stop taking Calan suddenly without speaking to your doctor, as this may affect blood pressure or heart rhythm.
Side Effects
Calan may cause side effects as the body adjusts to treatment. Not everyone will experience these effects, and many are mild and improve over time.
However, some side effects may require medical attention, especially if they become severe or persistent.
Common Side Effects
- Constipation may occur because Calan can slow down movement in the digestive system.
- A headache can happen as blood vessels relax and blood flow changes.
- Dizziness or lightheadedness may be felt, especially when standing up quickly, due to lowered blood pressure.
- Nausea can occur as the body adjusts to the treatment.
- Fatigue or unusual tiredness may be experienced as the heart rate slows down.
- Low blood pressure may cause a feeling of weakness or faintness in some individuals.
- Sleep disturbances may occur, including difficulty falling or staying asleep.
Severe Side Effects
- Severe dizziness or fainting may be a sign of very low blood pressure and needs immediate attention.
- Swelling in the ankles or feet may indicate fluid buildup or heart-related issues.
- Shortness of breath or worsening chest symptoms may suggest a serious heart condition.
- A very slow or irregular heartbeat may occur and require urgent medical care.
- Persistent vomiting that does not stop can lead to dehydration and needs evaluation.
- Severe constipation that does not improve may require medical treatment.
- Unusual tiredness or sudden weight gain may be linked to fluid retention or heart problems.
If any severe symptoms occur, seek medical help right away. For common side effects that do not go away or become bothersome, consult a healthcare provider for guidance.
Missed Dose
If you miss a dose of Calan, take it as soon as you remember on the same day. If it is already close to your next scheduled dose, skip the missed dose and continue with your regular schedule.
Do not take two doses at the same time to make up for a missed dose, as this may increase the risk of side effects such as low blood pressure or slow heart rate.
Taking Calan consistently at the same time each day helps maintain stable blood pressure and heart rhythm control.
Overdose
Taking more than the prescribed dose of Calan can lead to serious health risks. An overdose may cause very low blood pressure, slow or irregular heartbeat, dizziness, fainting, or difficulty breathing.
In severe cases, it may affect heart function and require urgent medical care. If an overdose is suspected, seek immediate medical attention or contact emergency services right away.
Early treatment is important to prevent serious complications.
Storage Information
Calan should be stored at room temperature, ideally between 20°C and 25°C, in a dry place away from heat and moisture.
Keep the tablets in their original packaging to protect them from light and damage. Do not use the tablets if they appear discolored, broken, or damaged. Always keep Calan out of reach of children and pets.
Any unused or expired product should be disposed of properly according to local guidelines to ensure safety.
Warnings
Calan does not have a formal boxed warning, but there are important precautions that should be clearly understood before use.
- This medication should not be used in people with very low blood pressure or severe heart conditions unless directed by a healthcare provider, as it may worsen these conditions.
- Calan may cause serious heart rhythm problems in rare cases, especially in patients with existing heart conduction issues or those using other heart-related treatments.
- Calan should be used carefully in combination with beta blockers or similar drugs, as this may lead to excessive slowing of the heart or reduced heart function.
- Calan may worsen heart failure in patients with moderate to severe heart disease, so close monitoring is important.
- Calan can cause dizziness or fainting, especially when starting treatment, so activities that require alertness should be done with caution.
- Calan should be used with caution during pregnancy, as the risk to the unborn baby cannot be ruled out.
- This medication can pass into breast milk, so breastfeeding should be discussed with your doctor before use.
These precautions are important for safe use and help reduce the risk of serious side effects. Always follow medical advice and report any unusual symptoms during treatment.
Contraindications
- Calan should be avoided in people with very low blood pressure or cardiogenic shock, as it can lower blood pressure even more. It is also not recommended for patients with serious heart rhythm problems, such as second or third degree heart block or sick sinus syndrome, unless a pacemaker is in place.
- Patients with severe heart failure should not use Calan, as it may worsen heart function. It should also not be used together with intravenous beta blockers, since this combination can slow the heart too much and reduce its ability to pump effectively.
- Calan is not suitable for certain types of abnormal heart rhythms, including ventricular tachycardia or conditions with extra electrical pathways like Wolff Parkinson White syndrome, as it may increase the risk of dangerous heart rhythm complications.
- Do not use Calan if you have a known allergy to verapamil or its ingredients.
Interactions
- Beta blockers such as metoprolol or propranolol
- Digoxin
- Blood pressure drugs such as aliskiren and clonidine
- Heart rhythm drugs such as disopyramide and dofetilide
- Fingolimod for multiple sclerosis
- Lithium for mood disorders
- Certain antibiotics, such as erythromycin and clarithromycin
- Statins such as simvastatin and atorvastatin
- Anti-seizure drugs such as carbamazepine
- Herbal supplements such as St John’s Wort
- Grapefruit or grapefruit juice
- Other drugs processed by the liver or kidneys
Cost & Coupons
Buy Calan Online From Canada
Getting Calan online can be more affordable when sourced through trusted Canadian pharmacies. Pharma Giant connects patients with licensed pharmacy partners to help you access Calan at a lower price, without compromising quality or safety.
- Lower pricing compared to many U.S. retail options for Calan and verapamil SR
- Sourced from licensed Canadian pharmacies that follow strict safety standards
- Shipped directly to your home across the U.S. with tracking included
- Transparent pricing so you know the cost before checkout
- Option to order up to a 90-day supply for added savings and convenience
- Reviewed by licensed doctors and verified by pharmacists before shipping
- Proper packaging and handling to maintain product quality during transit
Calan Discounts and Coupons from Pharma Giant
You can save more on your first order by using a verified promo code at checkout.
Use code PGSAVE10 to get 10% off your first Calan order.
How to Order?
| Step 1: Search for your Calan on the website, choose the correct strength and quantity, then add it to your cart.
Step 2: Enter your contact details, shipping address, and payment information. Create an account if you are a new customer or log in if you already have one.
Step 3: If your order includes prescription Calan, upload it directly to the site, email it, or fax it. Over-the-counter items do not require a prescription.
Use PGSAVE10 to claim your 10% discount on your first order. |
Pharma Giant’s Guarantee
Pharma Giant focuses on safety, affordability, and reliability. All Calan orders are sourced from licensed Canadian pharmacies and reviewed by healthcare professionals before being shipped.
Every order is handled with care to ensure it meets quality standards. You also have the option to order a longer supply, which can help reduce overall cost and avoid interruptions in treatment.
With verified sourcing, secure ordering, and consistent pricing, Pharma Giant helps make access to Calan more convenient and dependable.
Frequently Asked Questions
Buying Calan from Canada
FDA-Prescription, Off-Label Information, and Limitations
Dosage & Administration
Adverse Reactions
Food & Drug Interactions
Storage & Travel
Drug Comparison
Disclaimer
Pharma Giant provides medical information to help you better understand medications and medical conditions.This content is for informational use only and does not replace advice from a licensed medical practitioner. Consult your doctor or pharmacist before starting or changing any medication. All our partners follow strict safety standards set by their country’s health authorities to make sure you receive safe and high-quality medications.
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