http://www.npr.org/blogs/health/2012/03/21/149064059/high-al...
So they sent 86 hikers up into the White Mountains in Northern California to test the theory.

The hikers were about split into two groups, according to the study just published in the Annals of Emergency Medicine. Half got placebos and half took 600-milligram doses of ibuprofen before, during and after they climbed to an altitude of 12,570 feet. Ibuprofen commonly comes in 200-milligram pills.

The results showed the placebo group was three times more likely to come down with acute altitude sickness. Twenty-six percent fewer people got sick in the ibuprofen group than the placebo group, and the symptoms of those who did get sick were less severe.

PF (not a Dr. and not playing one on the inter tubes)