Well.... the effect is only for about 4-ish hours per dose though I don't know how long it stays in your bloodstream after injestion.doctorSpoc said:it really is a human rights issue and could see some lawyers having a field day with this one.
I guess if you need a little "morning delight" before the race, you may have to lay off the performance enhancers there too. How it affects out of competition controls will depend upon how long it is in the blood.
My understanding is that there is now a study out there that suggests a performance enhancing ability in cycling (though other endurance sports are obviously in the same boat) at altitude. There was little - if any - benefit at sea level. Viagra is a vasodilator. (More on that here.) This makes sense, given what it does in its intended use.