Albuterol DPI (A006) Clinical Study-B2: Efficacy, Dose-Ranging and Initial Safety Evaluation

The main objective of this study is to evaluate the efficacy, dose-ranging and initial
safety profiles of A006, an Albuterol dry powder inhaler (DPI), in the dose range of 25 to
180 mcg per dose in comparison to the DPI Placebo Control and the Active (Reference)
Control. The study results of this study together with that of A006-B study will be utilized
to determine the optimum final dose range of A006 for further clinical studies.

The study will be conducted in male and female adult patients who have mild-to-moderate
persistent asthma but are otherwise generally healthy.

Inclusion Criteria:

- Generally healthy, male and female adults, 18-55 years of age at screening

- With mild-to-moderate persistent asthma for at least 6 months prior to screening and
having used a beta-agonist(s) inhaler

- Demonstrate a Forced Expiratory Volume (FEV1) at 50-85 percent of predicted normal
during screening baseline measurement

- Demonstrate an airway reversibility of greater than or equal to 15 percent within 30
minutes of inhaling 2 inhalations of Proventil MDI during screening visit

- Demonstrate Peak Inspiratory Flow Rate (PIF) within 80-150 L/min (after training), at
least 2 times consecutively

- Demonstrate ability to use a DPI and MDI inhaler properly after training

- Females must be not pregnant, not lactating, and using a clinically acceptable form
of birth control

- Properly agree to participate in the trial

Exclusion Criteria:

- A smoking history of more than or equal to 10 years or having smoked within 6 months
of screening visit

- Upper respiratory tract infections within 2 weeks or lower respiratory tract
infection within 4 weeks prior to screening visit

- Asthma exacerbations that required emergency care or a hospital stay within 4 weeks
prior to screening visit

- Any current or recent respiratory tract infections that might affect the response to
the study drug as determined by the investigator, including cystic fibrosis,
bronchiectasis, tuberculosis, emphysema and other significant respiratory diseases
besides asthma

- Current clinically significant cardiovascular, hematological, renal, neurologic,
hepatic, endocrine, psychiatric, malignant or other illnesses that could impact the
study as determined by the investigator

- Known intolerance or hypersensitivity to any ingredients of the study drug DPI or
Proventil MDI (i.e.: Albuterol, sulfate, lactose, milk protein, HFA-134a, oleic acid
and ethanol)