[zolbrek]

The first time I took sildenafil I had a bad headache and nausea, the next couple of times I didn't suffer from nausea and the headache wasn't as severe. I don't suffer from any side effects now other than my nose getting a bit stuffy every now and then, so in that sense I developed a tolerance to the medication's side effects. The boner effects still work just as reliably as day one, no tolerance development for me there.

[rickydroll]

you are lucky, in addition to the migraines and stuffy nose, sildenafil altered my vision making everything looked blue tinted. I tried a couple other drugs in that class but the migraines never went away.