Tylenol does help, not completely. I have tried taking it before the viagra and the headache still comes on. I'll go to sleep and in the morning it is pretty bad still. The effects of the viagra is still worth it.
Also, I have found that if I take 50 mg, at say 9 PM, me and my GF have awesome sex, and then in the morning, say 12 hours later, the viagra still works like a champ! I thought it was only supposed to work 4 hours or so, but for me it works quite a bit longer if I take it within a few hours of going to sleep. And SloppyJ, I have noticed the florescent lights in my house take on a bluish hue to them sometimes on viagra, no tracers though.