Acesion Pharma develops more efficacious and safe drugs for the treatment of atrial fibrillation (AF), the most common type of cardiac arrhythmia. Existing drug therapies generally have a limited effect or are associated with risk of serious adverse events, and there is therefore a considerable patient need for developing better and safer drugs. Inhibition of SK channels, an ion channel with relevance for regulating the heart rhythm, constitute a new and promising principle for the treatment of AF.