Symbicort Onset of Action 2

A Randomized, Multicenter, Placebo and Active-controlled, Single-dose, 4-period, Crossover Study to Evaluate the Bronchodilating Effect of SYMBICORT pMDI Versus Advair Diskus and Ventolin HFA.

The purpose of this study is to compare the early onset of effect of Symbicort compared to Advair Diskus and Ventolin in adults with asthma

Inclusion Criteria:

• At least 18 years of age
• Diagnosis of asthma and baseline lung function test results as determined by the protocol
• Required and received inhaled corticosteroids within timeframe and doses specified in the protocol

Exclusion Criteria:

• Severe asthma or asthma that is markedly effected by seasonal factors
• Has required and received non-inhaled corticosteroids within the previous 4 weeks, has sensitivity to drugs specified in the protocol or requires treatment with beta-blockers