Medical Questions of Our Time

Alright, at this point it is routine to see ads on TV for Cialis and Viagra and that other drug that I forget its name during baseball games and other programming. Putting aside the weirdness of that in general, I have a question. One of the ads says you're supposed to seek medical help if things don't, um, settle down for more than 4 hours. 4 hours? Okay, so when do you make the call to your doctor? At 3 hours? That still seems like an awfully long time. 2 hours? Do you wait 2 hours and then become concerned that it might go for another 2 hours? And then when you've made the decision to actually seek medical help, what medical help do you get? I'm not sure I want to think about that too much.
Then there are all these other ads for drugs which, as far as I can tell, turn you into a smiling person playing at the park. They don't really say what the drugs do, although you shouldn't take them if you are nursing, pregnant or may become pregnant. And they all give you a dry mouth and nausea apparently. But you won't notice, because you'll be happy playing at the park. Unless you're seeking medical attention.