To evaluate the safety, tolerability and plasma levels of single oral doses of MK0633 in pediatric asthma patients ages 6 to less than 12 years.

Inclusion Criteria:

• Patient has mild to moderate asthma
• Patient is able to swallow pills
• Patient is able to have have blood draws

Exclusion Criteria:

• Patient has required a visit to the hospital or emergency room due to an asthmatic event in the last 3 months
• Patient has an upper respiratory tract infection (URI)
• Patient has a history of stroke
• Patient consumes more than 4 caffeinated beverages per day