I think I'm one of the lucky ones that get almost no side effects, maybe some flushed/red face for about 10-15 mins and then goes away, even at 100mg I've experienced no other side effects, no stuffy nose, no headaches, no funny vision etc, that's also one of the main reason I've stuck with V until now, haven't tried Spedra/Levitra or any of the other variants since V works so well for me, like I said the only downside is the slightly longer onset time, takes an hour to kick in.