Clinical Assessment Of GW815SF HFA MDI In Pediatric Patients With Bronchial Asthma

Inclusion criteria: * Inclusion Criteria for Entry in Run-in Period A pediatric patient already diagnosed as having bronchial asthma who meets all of the following criteria is eligible for the study: * Male or female patients aged ≥5 and ≤14 years. Enrolment of a female patient of childbearing potential is allowed only if she is tested negative in the pregnancy testing at the start of Treatment Period 1 and if she agrees to undergo pregnancy testing at the protocol-specified timings and to take contraceptive measures without fail. * Written informed consent must be obtained from a legally acceptable representative of the subject. Consent of the subject him/herself should also be obtained, wherever possible, after giving an explanation in an as easy to understand as possible manner. * An outpatient who has been treated with ICS (FP 100μg/day or equivalent) for at least 4 weeks prior to Visit 1. * Able to use a peak flow meter in a correct manner in the investigator's/subinvestigator's judgment. * Able to use MDI and DPI in a correct manner (with the assistance of his/her caregiver as necessary) in the investigator's/subinvestigator's judgment. Inclusion Criteria for Entry in Treatment Period 1 A subject will be randomized to one of the two treatment groups only if he/she has completed the run-in period and meets all the following criteria. 1. Has a mean of morning PEF measurements in the last 7 days of the run-in period (excluding the first day of Treatment Period 1) ≤90% of his/her best PEF measurement . 2. Was able to perform entry in the asthma diary and PEF measurements in a correct manner in the investigator's/subinvestigator's judgment. 3. Able to use MDI and DPI in a correct manner (with the assistance of his/her caregiver as necessary) in the investigator's/subinvestigator's judgment. Exclusion criteria: * Exclusion Criteria for Entry in Run-in Period A patient who applies any of the following criteria is not eligible for the study: * Admitted to the hospital due to asthma exacerbation within 8 weeks prior to Visit 1. * Used systemic steroid within 4 weeks prior to Visit 1. * Received antibacterials or antivirals for treatment of upper or lower respiratory tract infection within 2 weeks prior to Visit 1. * Has a safety problem in participation in the study because of a serious, uncontrolled systemic disease including nervous system disorder. * Has or is suspected to have deep-seated mycosis or infection to which no effective antibacterial agent is available. * Has or is suspected to have hypersensitivity to the investigational product, rescue medication or any ingredients of them. * Is pregnant or lactating, may be pregnant, or plans for pregnancy during the study period. * Has received the last dose in another clinical study within 2 months prior to this study. * Is not eligible for the study in the investigator's/subinvestigator's judgment. Exclusion Criteria for Entry in Treatment Period 1 Enrolment of a subject completing the run-in period into Treatment Period 1 will not be allowed if any of the following applies: 1. Admitted to the hospital due to asthma exacerbation during the run-in period. 2. Had upper or lower respiratory tract infection during the 2 weeks just before Visit 2. 3. Used prohibited drugs during the 2 weeks just before Visit 2. 4. Is not eligible for the study in the investigator's/subinvestigator's judgment. Exclusion Criteria for Entry in Treatment Period 2 Enrolment of a subject completing the washout period into Treatment Period 2 will not be allowed if any of the following applies: 1. Admitted to the hospital due to asthma exacerbation during the washout period. 2. Had upper or lower respiratory tract infection during the 2 weeks just before Visit 4. 3. Used prohibited drugs during the 2 weeks just before Visit 4. 4. Is not eligible for entry in Treatment Period 2 in the investigator's/subinvestigator's judgment.