What is the most effective way to deal with hypoxia?

The most effective way to deal with hypoxia is to descend to a lower altitude. As altitude increases, the availability of oxygen decreases due to the lower atmospheric pressure, which can lead to reduced oxygen levels in the bloodstream. When a pilot or passenger experiences symptoms of hypoxia, such as lightheadedness, confusion, or shortness of breath, descending to a lower altitude where the air pressure and consequently the oxygen levels are greater can alleviate these symptoms quickly.

While supplemental oxygen is another effective method for managing hypoxia, in situations where a rapid descent is possible, getting to a safer altitude takes precedence. Increasing cabin pressure is relevant for pressurized aircraft and does not apply in scenarios where the aircraft is not equipped to maintain pressure at high altitudes. Drinking water, while important for overall hydration and health, does not directly combat the effects of hypoxia. Therefore, descending to a lower altitude is the most immediate and effective response to hypoxia.