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One of these parts is the penis and another is the pulmonary system, or lungs. [7 Surprising Reasons for Erectile Dysfunction] This is why Viagra and Revatio, a drug prescribed to combat pulmonary hypertension (high blood pressure in the arteries of the lungs), are in fact just two names for the same substance. Even healthy people can start to experience some of the fatigue associated with pulmonary hypertension when they travel to very high elevations, where available oxygen wanes and blood vessels in the lungs constrict. Multiple studies have shown that sildenafil can help to reverse this effect, improving oxygen delivery to muscles and offsetting the usual drop in endurance associated with high altitude.

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