Definition
Medications that reduce swelling and mucus in the nose, sinuses, and ears by narrowing small blood vessels in those tissues. Common forms include pseudoephedrine and phenylephrine, taken as tablets, liquids, or nasal sprays. The FAA generally cautions pilots against flying while using oral decongestants because they can cause dizziness, drowsiness, blood pressure changes, and impaired judgment.
Plain English
Cold and sinus medicines that unblock a stuffy nose by shrinking swollen tissue. They help you breathe more easily but can also affect how alert and steady you feel.
Context Anchor
Seen in FAA discussions of drugs and in personal go/no-go decisions when a pilot has a cold, allergies, or sinus congestion.
Derivation
From 'de-' (reverse or remove) and 'congest' (from Latin congerere, to pile up or crowd together). A decongestant literally undoes the 'piled up' fluid and swelling in blocked nasal passages.
Why Pilots Care
Many decongestants carry side effects that impair alertness, decision-making, or physical control, directly affecting flight safety.
Grounding Statement
A decongestant may make breathing feel easier while the pilot is still not fully fit to fly.
Intuition Check
Do not assume “over-the-counter” means “safe for flying.” The key question is whether both the medicine and the condition being treated leave the pilot fully safe and alert.
Example Sentence 1
She skipped her morning flight because she had taken a decongestant the night before and didn't want to risk lingering side effects.
Example Sentence 2
After checking with an aviation medical examiner, she avoided decongestants entirely during the cross-country flight.