Calan/Calan SR includes the active component Verapamil Hydrochloride, which is a calcium channel blocker. It operates by influencing the transport of calcium in the blood vessel and hearts.  Consequently, Calan/Calan SR soothes blood vessels, increasing oxygen and blood delivery to the heart while decreasing its strain.

Use this medication precisely as recommended by your physician. Follow the prescription of your doctor carefully. 

Your physician’s medication dose is based on your condition, other medications or food supplements you may take, and your reaction to treatment. To diminish your risks for adverse effects, don’t increase your dosage; take it regularly, or take it as instructed by your physician. Adverse events may still happen even at usual prescription dosages. 

If your physician requests you to use this drug consistently, use it regularly to get the most benefits from it. Take it at a fixed time every day to make you remember it better. 

Your doctor may need to modify your dosages to ease your symptoms or if you develop adverse reactions. 

If you have any inquiries regarding information, ask your physician or pharmacist.

Calan/Calan SR is used in the following conditions:

  • Hepatic impairment 
  • Secondary prophylaxis of myocardial infarction
  • Certain heart rhythm disorders
  • Angina 
  • Hypertension 

This medicine may be recommended for different uses. Approach your physician or pharmacist for more information. 

Do not use Calan/Calan SR  in people with the following conditions:

  • Atrial fibrillation or atrial flutter
  • Severe ventricular dysfunction 
  • Sick-sinus syndrome
  • 2nd- or 3rd-degree AV block
  • Uncompensated heart failure
  • Marked bradycardia
  • Hypotension 
  • Cardiogenic shock

Calan/Calan SR may have the following side effects:

  • Hepatotoxicity
  • Gynaecomastia
  • Extrapyramidal symptoms
  • Gingival hyperplasia
  • Skin reactions
  • Abnormal liver function
  • Nausea
  • Constipation
  • Peripheral edema
  • Dyspnea
  • Headache 
  • Fatigue
  • Flushing 
  • Dizziness
  • Hypotension
  • Transient asystole
  • Severe cardiac failure
  • Bradycardia 
  • AV block

Keep in mind that your physician has recommended this drug since he or she has known that the advantage to you is more noteworthy than the risk of adverse reactions. Many individuals utilizing this medicine don’t have serious side effects.  

A serious allergy to this medication is uncommon. In any case, seek emergency medical help if you see any manifestations of a serious allergic response, including a rash, tingling or swelling of the face or tongue or throat, dizziness or difficulty breathing. 

This is not a complete list of side effects. Contact your physician or pharmacist if you see other effects not recorded above.

Take extra caution in patients with the following medical conditions:

  • Lactation
  • Pregnancy
  • Liver and kidney failure
  • Prevent abrupt withdrawal
  • Hypertrophic cardiomyopathy
  • Attenuated neuromuscular spread
  • People suffering  with bradycardia or 1st-degree AV block

Before taking this medicine, tell your physician or pharmacist if you are allergic to it or if you have some other hypersensitivities. This drug may contain inert ingredients, which can cause unfavorable side effects or different issues. Talk with your pharmacist for more information.


Calan/Calan SR may interact with the following medicines:

  • Carbamazepine
  • Quinidine 
  • Colchicines 
  • Atorvastatin
  • Simvastatin
  • Lovastati
  • Everolimus
  • Tacrolimus
  • Carbamazepine 
  • Quinidine 
  • Colchicines 
  • Atorvastatin
  • Simvastatin
  • Lovastati
  • Everolimus
  • Tacrolimus
  • Ciclosporin
  • Sirolimus
  • Prazosin
  • Terazosin
  • Metoprolol
  • Propranolol
  • Digitoxin
  • Digoxin
  • Clonidine
  • Telithromycin  
  • Aspirin 
  • Sulfinpyrazone
  • Phenobarbital  
  • Rifampicin 
  • Cimetidine  
  • Ritonavir 
  • Erythromycin  

This is not a complete list of drug interactions. Approach your physician or pharmacist for more details. 

The effects of certain medications can change if you simultaneously consume different medications or herbal products. This can build your risk for side effects or may cause your drugs not to work effectively. These interactions are conceivable yet don’t generally happen. Your physician or pharmacist can prevent or oversee interactions by changing how you utilize your prescriptions or by close checking. 

While utilizing this drug, don’t start, stop, or change the dose of other medicines you use without your physician’s advice.

Symptoms of overdose may include the following: 

  • Cardiac arrest
  • Altered mental status
  • Shock
  • Arrhythmias
  • ECG changes
  • Impaired conduction
  • Seizures 
  • Renal dysfunction
  • Metabolic acidosis
  • Hyperkalaemia 
  • Hyperglycaemia 
  • Conduction abnormalities
  • Hypotension
  • Bradycardia

Seek medical help immediately. 

Available Brands:

  • Veral 
  • RiteMED Verapamil 
  • Isoptin SR/Isoptin

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