Prochlorperazine Maleate Versus Placebo for the Prophylaxis of Acute Mountain Sickness

Inclusion Criteria: * Adults \>18 years old. Exclusion Criteria: * Individuals \<18 years old or \>75 years old * Pregnant women * Individuals who reside at or have slept at elevations \>1,800 meters in the last two weeks * Individuals having taken acetazolamide, steroids, ibuprofen, anti-emetics or additional analgesics within the last 24 hours prior to study initiation * Individuals requiring supplemental baseline oxygen or with chronic disorders known to be significantly impacted by hypoxia * Individuals with known allergies to prochlorperazine or phenothiazines * Individuals taking medications with significant medication interactions with prochlorperazine: Dofetilide, potassium acid phosphate, potassium chloride, potassium citrate, potassium phosphate, Yohimbe. * Individuals with a history of dementia * Individuals who lack decision making capacity