Good news for coffee drinkers. Caffeine can improve airway function for approximately two to four hours after consumption. The drug's similarity to theophylline, a bronchodilator, means that it has potential for people with asthma, even if a morning cup of joe isn't as potent or fast-acting as a rescue inhaler.
Try to avoid caffeine for four hours before a lung function test, or the benefits of this compound could make the test results inaccurate.

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