Study of Daily Dosing With Levalbuterol, Racemic Albuterol, and Placebo in Pediatric Subjects With Asthma

Inclusion Criteria Subject and subject's p/l guardian must be willing and able to comply with the study procedures and visit schedules Subject, male or female, between the ages of 4 to 11 yrs Female subjects 8 yrs or older will have a negative serum pregnancy test Must have a documented diagnosis of asthma for a minimum of 6 months prior to study start Must have stable baseline asthma and have been using a B-adrenergic agonist, and/or anti-asthma anti-inflammatory medication, and/or over-the-counter asthma medication for at least 6 mos. prior to study start Must be in good health with the exception of reversible airways disease and not suffering from any chronic condition that might affect their respiratory function Must have a chest X-ray that is not diagnostic of pneumonia, atelectasis, pulmonary fibrotic disease, pneumothorax, chronic obstructive pulmonary disease etc Subject's p/l guardian must be able to complete the diary cards and medical event calendars reliably on a daily basis, understand dosing instructions and questionnaire completion, and demonstrate how to use the MiniWright PEF meter Exclusion Criteria Female subject who is pregnant or lactating Have participated in an investigational drug study within 30 days prior to study start, or who is currently participating in another clinical trial Schedule prevents him or her from taking the first daily dose of study medication and/or starting study visits before 9 AM Have travel commitments during the study that would interfere with trial measurements or compliance or both Have a history of hospitalization for asthma within 60 days prior to study start, or who is scheduled for in-patient hospitalization, including elective surgery during the course of the trial Have a known sensitivity to levalbuterol or racemic albuterol, or any of the excipients contained in any of these formulations Subject using any prescription drug with which albuterol sulfate administration is contraindicated Have currently diagnosed life-threatening asthma defined as a history of asthma episodes requiring intubation, associated with hypercapnia, respiratory arrest, or hypoxic seizures within 3 mos. prior to study start Have a history of cancer Subject with hyperthyroidism, diabetes, hypertension, cardiac diseases or seizure disorders that currently are not well controlled by medication or that may interfere with the successful completion of this protocol Have a history of substance abuse or drug abuse within 12 months preceding V1 or a positive urine drug screening at study start Have a documented history of bronchopulmonary aspergillosis or any form of allergic alveolitis Has suffered from a clinically significant upper or lower respiratory tract infection in the 2 wks prior to study start Have a history of cigarette smoking or use of any tobacco products Subject who is a relative of a staff member