The problem with daily and long term use of PDE5's is your body becomes immune and they stop working. Best to take long breaks every now and than. Easier said then done when you're with a woman with a very high sex drive. For the past two years, I was taking viagra, average 100mg daily, mixed with light cialis use. Stuff stopped working so well. Told my woman she was just going to have to work with me. Craziest thing happened. After about a month, being off all of it, I started getting spontaneous erections, rock hard, harder than with viagra.I have psychological ED more than anything, as my girl likes me to just be ready. You know, if I'm going down on her, making out, she reaches down and expects things to be stiff. I go downtown and come up and it ain't ready and she takes that as a form of my not being into her. I'm older and need some damn direct stimulation. Once I'm hard, I'm hard as they psychological stuff has passed and I'm good to go for as long as she wants it.
My point is, you cannot abuse PDE5's or they will stop working. Use them daily, but about once every few months, take 10 days off or so and let your system wash out. When you go back to it, it will work much better.