This confirms my own experience that taking Viagra under the tongue works fast.  Usually a crush an already subdivided pill in my teeth and then slosh it around inside my mouth.  I've noticed effects in as little as five minutes.

Now if only they had one that works on penises

If you can't get your tongue back in your mouth for more than four hours, contact your physician.

I think if you can keep your tongue out for four hours there are some ladies who would like you to contact them as well.

Nah, just swish well with the water.  Carry gum😉