Viagra protects mountain climbers lungs
The researchers used climbers as “guinea pigs” to test how effective Viagra was in relieving pulmonary hypertension. 
Fourteen healthy male mountaineers were given either Viagra (sildenafil) or a dummy pill.
It was found sildenafil reduced high blood pressure and improved the transport of oxygen in the blood in both situations.:dubious:
Sildenafil is used because there is a biochemical similarity between the penis and the lungs :eek: