I have a.f. left ventricle heart failure. I take 80 gms of furusemide in the morning and 40gms afternoon. I'm fine one week then the next week my feet hurt and though not badly swollen they are a bit puffy. I don't feel as well as I was. My gut feeling is to take extra furusemide but I'm afraid of over doing it. Is there a safe limit? I was given liquid dose in vein when originally diagnosed in hospital.