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@hippy
"One of the quirkiest presentations [451] was about the effect of viagra (sildenafil) on endurance performance at a simulated moderately high altitude of 3900 m. All 10 of the trained cyclists in the study performed a 6-km time trial worse at altitude than they would have at sea level, as you would expect, but four of them were much worse (15 min to complete the distance instead of 10 min). The extra impairment in these four cyclists disappeared when they consumed sildenafil before the performance test. There was little effect of the sildenafil on the other six cyclists at altitude, and little effect on all 10 cyclists at sea level. How come? By dilating arterioles, sildenafil reversed the excessive hypoxic pulmonary vasoconstriction that limited cardiac output in the four cyclists. See the full paper in J Appl Physiol for more. I doubt whether there would be substantial benefit for any athletes at moderate altitude."
It might help people with problems competing at altitude but for everyone else.. there's mastercard.