--- title: Buy Calan SR 120mg/240mg Sustained Release Pills description: Calan SR sustained-release verapamil for hypertension and angina. 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Originally developed by Searle, this calcium channel blocker is used for hypertension management and chronic stable angina. The extended-release design is ideal for adults requiring consistent medication levels throughout the day. 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It is supplied in 120 mg and 240 mg strengths and belongs to the class of cardiovascular agents used to manage heart rhythm disorders, angina pectoris, and hypertension. Verapamil works by inhibiting calcium influx into cardiac and smooth-muscle cells, thereby reducing contractility and vascular tone. Besides its primary cardiovascular indications, verapamil may be employed in certain off-label contexts under specialist supervision. ## Quick Reference Facts **Active Ingredient** : Verapamil **Form** : pill - 120 mg | 240 mg **Primary Uses** : • Hypertension : • Angina pectoris : • Supraventricular tachycardia (SVT) ## What is Calan Sr? Calan Sr is the generic version of medications that contain the active compound verapamil. It is marketed as a tablet formulation available in 120 mg and 240 mg dosages. Verapamil-containing products are widely prescribed for cardiovascular disorders, and the generic version provides a cost-effective alternative to brand-named preparations such as Isoptin®, Verelan®, and the branded Calan® tablets. The medication is produced by licensed pharmaceutical manufacturers that meet international quality standards; however, specific manufacturer details are variable across regions. ## How Calan Sr Works Verapamil is a phenylalkylamine calcium-channel blocker. It selectively inhibits L-type calcium channels in the myocardial cells, the sinoatrial (SA) and atrioventricular (AV) nodes, and vascular smooth muscle. By reducing calcium entry, verapamil decreases the force of cardiac contraction (negative inotropy), slows electrical conduction through the AV node (negative dromotropy), and lowers peripheral vascular resistance (vasodilation). These actions translate clinically into: * Lowered systolic and diastolic blood pressure in hypertension. * Reduced myocardial oxygen demand and improved coronary blood flow in angina. * Suppression of re-entrant tachyarrhythmias, particularly SVT. The oral tablet is absorbed rapidly, reaching peak plasma concentrations within 1-2 hours. Verapamil undergoes hepatic metabolism primarily via CYP3A4 and is excreted both renally and fecally, giving an elimination half-life of approximately 3-7 hours for the immediate-release formulation used in Calan Sr. ## Conditions Treated with Calan Sr - **Hypertension** - Verapamil lowers systemic vascular resistance, helping to achieve target blood-pressure goals when used alone or in combination with other antihypertensives. - **Angina pectoris** - By decreasing myocardial contractility and heart rate, verapamil reduces cardiac workload and oxygen consumption, relieving chest pain episodes. - **Supraventricular tachycardia (SVT)** - Verapamil’s AV-node blocking effect slows rapid atrial impulses, restoring normal rhythm in patients with paroxysmal SVT. Each of these indications is supported by regulatory approval in the United States, European Union, and many other jurisdictions. ## Is Calan Sr the Right Medication for You? Calan Sr is appropriate for adult patients who: * Have documented hypertension, chronic stable angina, or documented SVT where rate control is needed. * Do not have severe left-ventricular dysfunction (ejection fraction < 35 %) because negative inotropic effects may worsen heart failure. * Are not taking contraindicated medications such as strong CYP3A4 inhibitors (e.g., clarithromycin, ketoconazole) that could raise verapamil plasma levels. Contraindications include: * Known hypersensitivity to verapamil or any excipients in the tablet. * Second- or third-degree AV block without a permanent pacemaker. * Severe hypotension (systolic < 90 mm Hg). * Acute myocardial infarction with ongoing ischemia. Patients with hepatic impairment, renal insufficiency, or advanced age should have dosing adjustments and close monitoring. ## Buying Calan Sr from [our online pharmacy](https://liabilis.com/order-calan_sr-online-en.html) ### Why Choose Our Service? Accessing cardiovascular medicines can be challenging due to insurance limitations or high brand-name prices. [our online pharmacy](https://liabilis.com/order-calan_sr-online-en.html) delivers a reliable, cost-effective solution for patients seeking the generic verapamil tablet. ### Quality & Safety Assurance We partner with licensed international pharmacies to ensure quality and authenticity. Every shipment is sourced from manufacturers that comply with Good Manufacturing Practice (GMP) standards. ### Pricing & Access Because Calan Sr is a generic formulation, it is priced significantly lower than branded equivalents such as Isoptin® or Calan®. This enables patients to maintain long-term therapy without prohibitive costs. ### Discreet Delivery Orders are packed in unmarked, privacy-protected packaging and dispatched with express delivery typically within 7 days, or standard airmail in approximately 3 weeks. Your health information remains confidential throughout the process. ## Use: Dosing, Missed Dose, Overdose - **Standard dosing** - For hypertension or angina, the usual adult dose is 120 mg once daily; some patients may require 240 mg once daily or divided into twice-daily doses. For SVT, an initial dose of 240 mg may be used, followed by maintenance dosing as directed by a clinician. - **Missed dose** - If a dose is missed and it is less than 12 hours until the next scheduled dose, take the missed tablet now. If it is closer to the next dose, skip the missed tablet and resume the regular schedule. Do not double-dose. - **Overdose** - Symptoms may include severe bradycardia, hypotension, cardiac conduction disturbances, and life-threatening arrhythmias. Seek emergency medical care immediately; supportive measures such as intravenous fluids, atropine, or temporary pacing may be required. **Administration tips** - Verapamil tablets may be taken with or without food. Avoid concomitant alcohol, as it can enhance hypotensive effects. Refrain from operating heavy machinery or driving until you know how the medication affects you. ## Safety Information ### ⚠️ Who Should Not Take Calan Sr - Patients with known hypersensitivity to verapamil. - Individuals with advanced AV-node block (second- or third-degree) without a permanent pacemaker. - Those experiencing severe hypotension (systolic < 90 mm Hg). - Persons with acute myocardial infarction who have ongoing ischemia. ### Common Side Effects - Mild dizziness or light-headedness (often transient). - Constipation, occurring in up to 10 % of users; increase fluid intake and dietary fiber to mitigate. - Peripheral edema, particularly in the ankles, which usually resolves with dose adjustment. ### Serious Side Effects (Seek Immediate Medical Help) - Marked bradycardia (< 50 bpm) or heart block. - Severe hypotension (systolic < 80 mm Hg) leading to syncope. - New or worsening heart failure symptoms (edema, dyspnea). - Allergic reactions such as rash, swelling, or anaphylaxis. ### Drug & Food Interactions - **CYP3A4 inhibitors** (e.g., clarithromycin, ketoconazole, itraconazole) - increase verapamil levels; dose reduction may be necessary. - **CYP3A4 inducers** (e.g., rifampin, carbamazepine) - decrease efficacy; monitor blood pressure and heart rate. - **Beta-blockers** - additive bradycardic effect; combined use requires careful titration. - **Digoxin** - verapamil raises digoxin concentrations; monitor serum digoxin levels. - **Grapefruit juice** - can raise plasma verapamil concentrations; avoid or limit intake. ## Off-Label and Investigational Uses of Calan Sr Verapamil has been explored in several off-label contexts: - **Migraine prophylaxis** - Small clinical studies suggest calcium-channel blockade may reduce migraine frequency. - **Cluster headache** - Case reports indicate benefit when traditional therapies fail. - **Certain arrhythmias** - Use in atrial fibrillation rate control has been reported, though not formally approved. These applications lack regulatory endorsement and should only be pursued under specialist supervision. Safety and efficacy have not been established through large-scale trials. ## Storage & Handling Store Calan Sr tablets at controlled room temperature (20-25 °C). Protect from excessive heat, moisture, and direct sunlight. Keep the container tightly closed and out of reach of children. Do not use tablets past the printed expiration date. Dispose of any unused medication by returning it to a pharmacy take-back program or following local hazardous-waste guidelines. ## Frequently Asked Questions **Practical Use & Lifestyle** - **Can I travel internationally with Calan Sr?** Yes. Keep the tablets in their original container, carry a copy of the prescription (if required), and be aware of each country's import regulations for prescription medicines. - **Does alcohol interact with Calan Sr?** Alcohol can amplify verapamil’s blood-pressure-lowering effect, potentially causing dizziness. Moderate consumption is advisable, and you should avoid excessive drinking. - **Should I take Calan Sr with meals?** Verapamil may be taken with or without food. Taking it with food can lessen gastrointestinal upset for some patients. **Product & Formulation Details** - **What do Calan Sr tablets look like?** The 120 mg tablets are typically round, white, and may have a film coating; the 240 mg tablets are larger, round, and may appear slightly bicolored depending on the manufacturer. - **Can the tablet be split?** Immediate-release verapamil tablets are not recommended for splitting because dose uniformity may be compromised. Use a prescribed strength that matches the required dose. **Regulatory & Safety Nuances** - **Will Calan Sr appear on a standard drug test?** Verapamil is not a prohibited substance in most occupational drug-testing programs and is unlikely to be flagged in routine panels. - **Is Calan Sr safe for elderly patients?** Older adults may be more susceptible to bradycardia and hypotension; start at the lowest effective dose and monitor blood pressure and heart rate closely. - **Can Calan Sr be used during pregnancy?** Verapamil is categorized as Pregnancy Category C in the United States; it should be used only if the potential benefit justifies the potential risk, and under close obstetric supervision. **Scientific & Clinical Curiosity** - **How does verapamil differ from other calcium-channel blockers?** Verapamil belongs to the phenylalkylamine subclass, which preferentially affects cardiac tissue, whereas dihydropyridines (e.g., amlodipine) act more on vascular smooth muscle. - **What was the pivotal trial for verapamil’s approval?** The FDA approved verapamil based on multiple hypertension and angina studies conducted in the 197s and early 198s demonstrating its efficacy in reducing blood pressure and chest-pain episodes. ## Glossary **AV node** : The atrioventricular node is a cardiac conduction tissue that delays electrical impulses between the atria and ventricles, allowing coordinated heartbeats. **Negative inotropy** : A reduction in the force of cardiac muscle contraction, which can lower blood pressure and myocardial oxygen demand. **CYP3A4** : An enzyme in the liver and intestine that metabolizes many drugs; inhibitors or inducers of CYP3A4 can alter the plasma levels of co-administered medications. ## Disclaimer The information provided about **Calan Sr** is intended for general educational purposes and does not substitute professional medical consultation. All therapeutic decisions, including those concerning off-label use, must be made under the guidance of a qualified healthcare provider. Readers are presumed to be responsible adults capable of making informed health choices. [our online pharmacy](https://liabilis.com/order-calan_sr-online-en.html) supplies **Calan Sr** to individuals who may encounter limited availability through conventional pharmacies or who seek affordable generic alternatives. Prior to initiating, adjusting, or discontinuing any medication, you should consult your doctor.