mountain sickness / altitude sickness
"I have used Diamox (generic form) at least six times and swear by the medication. Prior to using, I would get headaches and nausea so bad it would ruin the weekend trip. This drug is truly a miracle for people who suffer with the effects of altitude problems.  Very few side effects that I experience. Tingling in your fingers and toes on occasion, little tired, but not extreme.  Carbonated drinks are strange tasting as well."