Viagra Improves High Altitude Exercise Performance Up To 45% For Some

... Sildenafil (Viagra) significantly improved the cardiovascular and exercise performance measures of trained cyclists at high altitude, mostly because the drug helped some participants improve a lot while others showed little change. The responders improved 39% in the time trial performance at altitude compared to their performance at altitude with a placebo. Some in the responder group improved as much as 45%. Sildenafil provided no benefit to either responders or non-responders at sea level. ...