I have heard from some that you can become quite ill from the altitude. Does the trip include stops along the way to allow for adjusting to the altitude? Is there a medication you recommend taking in order to prevent it?
It's coca tea. Do NOT take any out of the country!
FYI, when you fly in a commercial jet, the cabin is pressurized to 8-10,000 ft altitude equivalent. The difference is you're pretty sedentary on a plane.