For nasal AMP challenge, PNIF measured before and every 5 minutes for 60 minutes after 4 squirts of 0.1 mL per actuation in each nostril of 400 mg/mL of AMP (ie, 320-mg total dose) delivered to the nose. The maximum decrease in PNIF measured using an In-check Nasal Inspiratory Flow Meter (Clement Clarke International Ltd, Harlow, United Kingdom).