Any active respiratory, cardiovascular or other disease requiring regular treatment or being otherwise relevant for tolerance of hypoxia or altitude exposure.
Any condition that may interfere with protocol compliance including current heavy smoking (>20 cigarettes per day or >20 pack-years with active smoking during the last 10 years), regular use of alcohol.
Allergy to acetazolamide and other sulfonamides.

NCT03536520_exc_T1
Condition
respiratory disease
NCT03536520_exc_T2
Condition
cardiovascular disease
NCT03536520_exc_T3
Condition
disease
NCT03536520_exc_T4
Qualifier
other
NCT03536520_exc_T5
Qualifier
active
NCT03536520_exc_T6
Scope
respiratory, cardiovascular or other disease
NCT03536520_exc_T7
Procedure
treatment
NCT03536520_exc_T8
Qualifier
regular
NCT03536520_exc_T9
Condition
tolerance
NCT03536520_exc_T10
Condition
hypoxia
NCT03536520_exc_T11
Mood
relevant for
NCT03536520_exc_T12
Observation
altitude exposure
NCT03536520_exc_T13
Scope
hypoxia or altitude exposure
NCT03536520_exc_T15
Condition
Allergy
NCT03536520_exc_T16
Drug
acetazolamide
NCT03536520_exc_T17
Drug
sulfonamides
NCT03536520_exc_T18
Scope
acetazolamide and other sulfonamides