This belongs to the group of medicines known as anti-arrhythmics.

Norpase is used to treat arrhythmias within the heart. An arrhythmia is an irregularity in the heartbeat, which causes the heart to skip a beat, beat irregularly, beat very fast or very slow.

Norpase works by correcting irregular heartbeats to a normal rhythm and by slowing an overactive heart, especially after a heart attack.

Norpase is available in tablet, capsule and injection form. It is also available as modified release capsules, which means the medicine is released more slowly to give an even effect.

It is also sometimes known as: Isomide CR; Rythmodan; Rythmodan Retard. You may notice the use of any of these names on the packaging of your medicine.