Is dilated cardiomyopathy reversible?

It depends: Strictly speaking, "dilated" cardiomyopathy is less likely to reverse. In other words, if the ventricle has already dilated, it is less likely that it will go back to normal, although it is still possible. The non-dilated weak heart (cardiomyopathy but not dilated) can and is more likely to go back to normal function with good medicine and proper care.

Depends: Depends on how severe it is. Milder forms can be controlled with medications, which is the majority of patients, and a normal lifestyle is quite possible. The most severe cases may be eligible for heart transplantation, talk to your doctor.

Treatable: It may not be entirely reversible but medical therapy has made great strides in effectively treating this condition. Given the shortage of donor hearts medical therapy frequently is very effective and pts can have a good quality of life.