Verapamil is a calcium channel blocker. It works by relaxing the muscles of your heart and blood vessels. Verapamil is used to treat hypertension (high blood pressure), angina (chest pain), and certain heart rhythm disorders.


Generic name: Verapamil (oral/injection)

Brand names: Calan, Isoptin SR, Verelan, Isoptin, Calan SR, etc

Drug classes: Calcium channel blocking agents, Group IV antiarrhythmics


Treatment of Hypertension (high blood pressure)

Treatment of Angina (heart-related chest pain)

Treatment of Arrhythmia


In Treatment of Hypertension (high blood pressure)

Calaptin 120 SR Tablet works by relaxing blood vessels so that blood can flow more easily around your body. This lowers your blood pressure and reduces your risk of having a stroke, heart attack, or kidney problems in the future. It must be taken regularly as prescribed to be effective. You do not usually feel any direct benefit from taking this medicine, but it works in the long term to keep you well. Do not stop taking this medicine without your doctor’s advice, even if you feel well.

In Treatment of Angina (heart-related chest pain)

Calaptin 120 SR Tablet helps treat heart-related chest pain (angina attack) as well as prevent it from happening in the future. However, it should not be used for acute attacks of angina. It works by relaxing and widening blood vessels in the heart. This makes it easier for blood to flow to the heart, so it gets more oxygen. This medicine thus helps to increase your ability to exercise and go about your daily life more easily and confidently. It should be taken regularly to be effective. Do not stop taking it without your doctor’s advice, even if you feel well.

In Treatment of Arrhythmia

Calaptin 120 SR Tablet may also be used to treat abnormal heart rhythms (arrhythmia). It may help stop an abnormal rhythm while it is happening or prevent its occurrence in the first place.

Directions for use

Use it as advised by your doctor or check the label for directions before use. Calaptin 120 SR Tablet is to be taken with food.

How it works?

Calaptin 120 SR Tablet is a calcium channel blocker. It blocks the action of calcium on the heart and blood vessels, thereby widening the blood vessels and allowing more blood and oxygen to reach the heart. This reduces blood pressure and decreases the chances of angina (chest pain).

Side effects

Call your doctor at once if you have:

  • Chest pain, fast or slow heart rate

  • A light-headed feeling, like you might pass out

  • Shortness of breath (even with mild exertion), swelling, rapid weight gain

  • Fever, upper stomach pain, not feeling well

  • Lung problems–anxiety, sweating, pale skin, wheezing, gasping for breath, cough with foamy mucus.

Common side effects may include:

  • Nausea, constipation

  • Headache, dizziness

  • Low blood pressure.


You should not use verapamil if you have a serious heart condition such as sick sinus syndromeor AV block (unless you have a pacemaker), severe heart failure, Wolff-Parkinson-White, Lown-Ganong-Levine syndrome, or slow heartbeats that have caused you to faint.

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