Had cardiac cough. dr prescribed lasix (furosemide). went away for 6 mo. now back. too much sodium? have idiopathic dcm and have bi vent. last ef 38%. no swelling

Maybe : Would expect you to have swelling of legs. If no swelling, cough maybe a cough that is not related to fluid build up irritating your lung.

Could be ACE inhib.: If you are on medications from a class of ace inhibitors, they may cause cough even after years of taking them. Best idea- see your cardiologist. You should limit salt in your diet to <2gm/day.