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[[File:Running_on_Rohtang_La.jpg|right|thumb|500px|Running on Manali Leh Highway, average elevation 4,000 m (13,000 feet) , rising to 5,328 m (17,480 feet). Image by TheHellRace.]]
Viagra can improve exercise at altitude, though it is not clear if a single dose is sufficient, or if it needs to be taken regularly. It is also not clear if everyone responds to Viagra in high altitude exercise the same way. In addition, Viagra may be a treatment for altitude sickness.
=Viagra and Performance=