Altitude sickness most commonly occurs when traveling higher than 8,000ft. A lack of oxygen causes nausea, exhaustion, dizziness, and shortness of breath. Runway offers Acetazolamide (Diamox), an FDA approved treatment that helps by decreasing CO2 in your bloodstream and, in turn, increasing oxygen levels. Tackle high elevations, adjust to altitude, and recover from hypoxia so you can keep on climbing. Use as directed.