Timely Administration of IV Magnesium Sulfate in Patients With a Moderate Asthma Exacerbation

This study is testing whether giving magnesium sulfate through an IV earlier during a moderate asthma attack improves outcomes in children treated in the emergency department. Magnesium sulfate is a medication that helps relax the muscles around the airways. **You may be eligible if...** - Your child is between 5 and 17 years old - Your child is being treated in the emergency department for a moderate asthma flare-up - You (the parent or caregiver) speak English **You may NOT be eligible if...** - Your child has other serious lung conditions besides asthma (such as chronic lung disease), cerebral palsy, congenital heart disease, depends on a tracheostomy, or has myasthenia gravis - Your child is pregnant - Parents or caregivers do not speak English Talk to your doctor to see if this trial is right for you.