Identify a class of medications generally avoided during flight duties due to CNS depression.

• A. Stimulants
• B. Antihistamines
• C. Antibiotics
• D. Sedatives (e.g., benzodiazepines) and other CNS depressants

Answer: (D)

Maintaining alertness during flight is essential, and medicines that depress the central nervous system undermine that. Sedatives, including benzodiazepines, directly slow brain activity, leading to drowsiness, slower thinking, impaired judgment, reduced coordination, and slower reaction times. These effects can persist after taking the medication, increasing the risk during critical flight phases when quick, accurate responses are needed. Other CNS depressants can cause similar issues with vigilance and respiratory drive, so they’re generally avoided during flight duties for safety reasons.

Stimulants don’t depress the CNS; they tend to increase alertness, though they come with their own risks and aren’t a universal solution for fatigue. Antibiotics are not a CNS-depression class, and while some antihistamines can be sedating, the broad category that’s most consistently problematic for flight safety is sedatives and other CNS depressants.