A Study of the Long-term Safety and Efficacy of Danicamtiv in Adults With Symptomatic Genetic and Familial Dilated Cardiomyopathy

Danicamtiv is an investigational medication, which means it is still being studied and has not been approved. The purpose of this study is to learn how well danicamtiv works, how safe it is, how well people can take it when used in patients with genetic or familial dilated cardiomyopathy (DCM). There are currently no approved medicines made specifically to treat genetic or familial DCM.

Inclusion Criteria: 1. Completed 24 weeks of blinded study treatment (corresponding to the Week 26 Visit in DAN-301) and planned assessments in Part 1 or Part 2 of the DAN-301 study. 2. If sexually active, must use a highly effective birth control method from the Screening Visit through 3 months after the last dose. 3. Is able to understand and comply with the study procedures, understand the risks involved in the study, and provide written informed consent according to local and institutional guidelines before the first study-specific procedure. Exclusion Criteria: 1. Acute coronary syndrome or hemodynamically significant epicardial coronary disease, or coronary revascularization (percutaneous coronary intervention \[PCI\] or coronary artery bypass graft \[CABG\]) performed within 90 days of DAN-302 Screening Visit. 2. Recent (\