Inclusion Criteria:
* Male or female asthmatic children/adolescents
* 1 to 18 years of age
* FEV1 greater than or equal to 50% predicted normal (where obtainable)
* Stable but symptomatic
* Diagnosis of asthma (per NIH criteria) at least 3 months before screening OR documented exacerbation or worsening of asthma or symptoms suggestive of asthma including nocturnal asthma, within 6 months of screening OR documented SAB use more than or at least once for symptom relief during the 4 days of run in with a total symptom score greater than or equal to 1 OR greater than or equal to 1 night disturbed due to asthma symptoms in previous month.
Exclusion Criteria:
* Any other significant childhood illness.
* Participated in any investigational clinical trial within the 30 days prior to screening.
* Use of any corticosteroid within 2 weeks of screening.
* Use of oral corticosteroid within 30 days of screening or prolonged use of oral corticosteroids within 12 weeks of screening.
* Use of inhaled long acting bronchodilators.
* Presumptive or documented history of upper or lower respiratory infection within 2 weeks before screening.
* Any history of acute or severe asthma attack requiring ICU admission or ventilatory support.
* History suggestive (or diagnosis) of other concomitant lung disease.
