I am a geriatric patient with CHF and right ventricular hypertension. My cardiologist has no experience with Revatio and prescribed the standard 3-20mg tabs/day, in November. It's helped me lose 8-10 lbs. of fluid and breath better, but I still have about 8-10 lbs of residual fluid that I can't seem to get rid of. Can he increase my dosage w/o ruining my kidneys? I am also on 2-40mg Lasix/day... Thank You, HR