Answer
Its main action is class Ic sodium-channel blockade. It also has some beta-blocking activity, which contributes to cautions in people with obstructive airways disease or slow heart rates.
Sources for this answer
- Arythmol 150mg Tablets — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.