A substance or medication that causes the airways to narrow and tighten, the opposite of a bronchodilator.
From broncho- (airways) plus constrictor (Latin agent noun from constring, 'one that binds'). The term identifies agents that produce the biological action of airway narrowing.
Some surprisingly common things are bronchoconstructors—aspirin sensitivity causes bronchoconstriction in some asthmatics, NSAIDs can trigger it, and even chlorine gas exposure causes it, which is why these substances are carefully avoided in susceptible individuals.
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