Calan is a calcium ion influx inhibitor which can be used for curing certain conditions related to the heart. It contains the active ingredient Verapamil HCL and inactive ingredients microcrystalline cellulose, corn starch, hypromellose, titanium dioxide, hydroxypropyl cellulose, gelatin, magnesium stearate, gtalc, polyethylene glycol, lactose and iron oxide colorant.

The brand-name tablets of Calan are color coded so as to facilitate safe usage. Some of the lower dose pills even have different shapes for easy identification.

Medical Uses

Calan is used to treat irregular heartbeat pattern called as supraventricular tachycardia. When a person is suffering from this condition the heart does not follow a rhythmic pattern as there is a certain disturbance in its normal pattern.

Calan normalizes the heart beat by slowing the electric conduction and heart rate. The medicine also relaxes the blood vessels and eases the flow of blood. This indirectly has an effect on hypertension wherein the blood pressuregets reduced and might even come to a normal state. As a secondary application the drug is also used to treat angina or chest pain.

Dosing Guide

The dose of Calan must be titrated only based on an individual’s condition. A usual dose of 80 mg to 120 mg 3 times a day is prescribed for patients in general. But people who have a better response to Calan can have a decreased dose.

Calan is available both in pill and injection forms, but it is usually given in the injection form under the strict supervision of a doctor. Patients who wish to treat this ailment at home must get adequate training from their health care facilitator and can do so by being careful in not exceeding the dosage. Dispose the medicine if any discoloration, crack or particles are visible in the liquid.

Side Effects

Side effects are a common reality for all chemical formulations. Some common side effects arising out of the use of Calan are:

  • Swelling, pain or redness in the area where injection is done
  • Fatigue
  • Dizziness
  • Headache

Below serious side effect might also occur in people, but on a rare basis

  • Allergic reactions – Hives or swelling of different parts of the body such as face, tongue or lips
  • Dark urine
  • Liver problems
  • Breathing problems
  • Changes in the color of stool

Precautionary advice

Patients who suffer from liver disease, congestive heart failure, muscular dystrophy, low blood pressure, neuromuscular disorders, kidney disease or myasthenia gravis should exercise caution while using Calan.

Make sure that a doctor is aware about your serious heart conditions such as heartbeats slow enough to faint, severe heart failure, Lown-Ganong-Levine syndrome, heart rhythm disorders of the atrium, or sick sinus syndrome. Patients with the above mentioned issues should not take Calan.

You can consult with a health care professional whether it is safe for you to take calan if you are pregnant, nursing a baby or planning to become a mother.

Calan is known to interact with beta-blockers, Aldosterone blockers and Phenobarbital and trigger adverse effects in the body. Hence you must avoid these medicines. But you must also inform your doctor about any other over-the-counter or prescription drugs you consume.


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