Snapshot A 12-year-old boy is brought to the emergency department for difficulty breathing and wheezing. Per the mother, the patient has a history of asthma and has been stable with his rescue inhaler. However, he began coughing 3 days ago and his breathing has gotten progressively worse. A physical examination demonstrates subcostal retractions and diffuse wheezing throughout the lung fields. Overview One of 7 medications used for asthma aimed to reduce inflammation and obstruction login to view 7 more bullets Inhaled Muscarinic Antagonists Mechanism of action login to view 4 more bullets Clinical use login to view 3 more bullets Adverse effects login to view 4 more bullets