My Cardiologist has put me on this drug to help clear up a severe case of Pulmonary Hypertension. I was on the drug for 21 days and it made a tremendous difference in my breathing. I went to the Pharmacy with a rx, and was told the drug is $500.00 per month; however, with insurance, my portion is $150.00 per month. I cannot afford this, as my rx bill is running $300.00 a month already. Looking for a less expensive alternative.