Revatio (sildenafil or viagra) was FDA-approved for treating PH symptoms in 2005. It works by relaxing the blood vessels in the lungs, which allows the heart to pump more blood into the lungs easier than when the vessels are constricted. Revatio is taken 3 times a day, 8 hours between each dose. Revatio costs at least $10,000 a year. Nitrates or nitric oxide should NOT be taken with Revatio, as it can cause an unsafe drop in blood pressure.
I began Revatio on August 16, 2007. I felt the need to add something along with the Tracleer, because I didn't feel it was doing enough for me almost a year after taking it. I still waited pretty long before asking about Revatio, but when I finally did, my PH doctor agreed to let me try it. I really feel that the combination of Tracleer and Revatio have been keeping me stable in the last few years! I hope it continues that way, but if I need to, I can increase the amount of Revatio I take before considering another drug to add to my daily regimen.