Hi Dee,
Yes, I am on 'revatio' or viagra, if you will. I've been on this medication for about a year now. When I first started taking it, the headaches were horrible! My PH specialist wanted me to take 30mg a day but I had to cut it back to 20mg & my headaches started to go away. I would get the headaches right after taking the medication so there was no mistake that that was what was causing them! My PH pressures were in the 80's when I started the revatio....they have come down to the mid 40's, which is wonderful!
How long have you been on it & what is your current dosage? You may let your doctor know about your headaches & hopefully he can reduce the dose which may relieve your symptoms.
Good luck & hope you find some relief soon!