###Human: There is no improvement in my father's cough. What to do? ###Assistant: Hi. It is good to hear that you are concerned and participating in treating your father's health issues. From your description, it looks like he has congestive heart failure. It means the fluid around his heart is causing the Atrial fibrillation and the cough. This is typical when lying down, since the position of the heart changes then. My advice is to consult your cardiologist to revise the dosage of Lasix (Furosemide). Furosemide is the only medicine that will help the water to clear out, it also might cause a bit of the cough, which was the reason for changing of the medicines by the cardiologist initially, due to the side effects of cough. I understand your concern, but according to me, the treatment is fine, except maybe he might now need a higher dose of Lasix or admission to get the Lasix IV administration. For further doubts consult a cardiologist online -->