A Safety, Efficacy and Tolerability Study in Pediatric Subjects With Asthma

This is a modified-blind, randomized, placebo-controlled, multicenter, parallel-group trial
of levalbuterol HFA MDI administered using a facemask and holding chamber in subjects birth
to <48 months with asthma. This study was previously posted by Sepracor Inc. In October
2009, Sepracor Inc. was acquired by Dainippon Sumitomo Pharma., and in October 2010,
Sepracor Inc's name was changed to Sunovion Pharmaceuticals Inc.

Inclusion Criteria:

- Subject's parent/legal guardian must give written informed consent, including privacy
authorization, prior to study participation. Complete documentation regarding the
consent process must be recorded in the case report form (CRF) and source
documentation.

- Subject's parent/legal guardian must be willing and able to comply with the study
procedures and visit schedules.

- Subject, male or female, must be between the ages of birth and <48 months, exclusive,
at the time of consent.

- Subjects 24 to <48 months of age must have a history of physician-diagnosed asthma
(defined as at least 3 episodes of respiratory symptoms consistent with asthma
symptoms including, but not limited to, cough, wheeze, or dyspnea).

- Subjects 0 to <24 months of age must have a history of 3 episodes of respiratory
symptoms that in the judgement of the investigator could be consistent with asthma or
reactive airways disease.

- Subject must be in good health and not affected by any other chronic conditions,
including respiratory disorders other than asthma.

- In subjects with a chest radiograph (taken 12 months prior to screening visit), no
evidence of any chronic cardiopulmonary condition other than asthma should be present
as discerned by the Investigator.

- Subject's parent/legal guardian must be able to complete the diary cards and medical
event calendars (MEC) reliably on a daily basis and understand dosing instructions
and questionnaire completion.

Exclusion Criteria:

- Subject who requires or is expected to require any disallowed medications

- Subject who has participated in an investigational drug study within 30 days prior to
screening, or who is currently participating in another clinical trial.

- Subject or parent/legal guardian who has daily commitments during the study that
would interfere with trial measurements, compliance, or both.

- Subject who has a history of hospitalization for asthma, reactive airways disease, or
bronchospasm within 4 weeks prior to screening or who is scheduled for in-patient
hospitalization, including elective surgery during the course of the trial.

- Subject who has experienced significant blood loss within 60 days of study drug.

- Subject with a clinical diagnosis of cystic fibrosis.

- Subject who was born prematurely, defined as less than 38 weeks gestational age at
birth, and is <1 year of age at screening

- Subject whose body weight is less than 7.0 kg at screening. This minimum weight
requirement is based upon standard pediatric growth charts [CDC 2000].

- Subject with 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 levalbuterol or racemic albuterol
sulfate administration is contraindicated.

- Subject with a history of life-threatening asthma, defined as previous asthma
episodes requiring intubation or associated with hypercapnia, respiratory arrest, or
hypoxic seizures.

- Subject with clinically significant abnormalities that may interfere with the
metabolism or excretion of the study drugs or study participation (eg, abnormalities
of renal, hepatic, metabolic, or endocrine function).

- Subject with a history of cancer.

- Subject with any chronic or congenital cardiorespiratory condition other than asthma
including, but not limited to, bronchopulmonary dysplasia, congenital heart disease,
and cystic fibrosis.

- Subject affected by an upper or lower respiratory tract infection in the 3 weeks
prior to screening.

- Subject with a history of ventilation for a respiratory condition occurring at or
near birth, including those associated with prematurity or bronchopulmonary
dysplasia. Ventilatory support for elective non-cardiopulmonary surgery is not
exclusionary. - Subject with any clinically significant abnormal laboratory values
(hematology, blood chemistry).

- Subject with a clinically significant abnormal 12-lead ECG that would put the subject
at risk for experiencing adverse cardiac effects.

- Subject who is a relative of a staff member.