Here's why a certain small, blue pill could help England's World Cup team in its match against Mexico

England's World Cup match against Mexico will be played in Mexico City at an elevation of 7,217 feet above sea level. Some medical professionals have suggested that sildenafil, the active ingredient in Viagra, may help athletes address altitude-related oxygen availability at high elevations. The drug works by relaxing blood vessels and increasing blood flow, which can improve oxygen delivery to muscles during physical exertion in low-oxygen environments.

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