New Combination Inhaler (FlutiForm HFA MDI 100/10 µg and 250/10 µg) Versus Fluticasone and Formoterol Administered Alone, and Placebo in Patients With Moderate to Severe Asthma

Ages eligible for study: 12 years and above; genders eligible for study: both; prior steroid use: steroid-requiring Inclusion Criteria: * History of asthma for at least 12 months. * Documented use of inhaled corticosteroid for at least 4 weeks prior to Screening Visit Demonstrate FEV-1 of 40-80% of predicted normal values at Screening and Baseline Visit. * Documented reversibility of 15% within 12 months of Screening visit or at Screening Visit (15% increase from pre-FEV-1 levels following albuterol inhalation or nebulized albuterol administration). * Symptoms of Asthma during Run-in. * Females of childbearing potential must have a negative urine pregnancy test at Screening and Baseline Visits. Females are eligible only if they are not pregnant or lactating, and are either sterile or using acceptable methods of contraception * Must otherwise be healthy. * Provide written informed consent. Wishes of minors must be respected. Exclusion Criteria: * Life-threatening asthma within past year or during Run-In Period. * History of systemic corticosteroid medication within 3 months before Screening Visit. * History of omalizumab use within past 6 months. * History of leukotriene receptor antagonist use, e.g. montelukast, within past week. * Current evidence or history of any clinically significant disease or abnormality including uncontrolled hypertension, uncontrolled coronary artery disease, congestive heart failure, myocardial infarction, or cardiac dysrhythmia. * Upper or lower respiratory infection within 4 weeks prior to Screening visit or during Run-In Period * Significant, non-reversible, pulmonary disease (e.g., chronic obstructive pulmonary disease \[COPD\], cystic fibrosis, bronchiectasis). * Known Human Immunodeficiency Virus (HIV)-positive status. * Smoking history equivalent to "10 pack years". * Current smoking history within 12 months prior to Screening Visit. * Current evidence or history of alcohol and/or substance abuse within 12 months prior to Screening visit. * Patients who are confined in institution.