 A total of 90 subjects 15 per treatment will be enrolled to ensure 12 subjects per treatment at the Day 14 evaluation, accounting for a 20 drop-out rate. A sample size of 12 subjects per treatment is required to detect a treatment difference of 28 in percent change of eNO at Day 14, assuming a pooled standard deviation of 20 with a power of 90. These estimates are based on examination of eNO levels in asthmatic vs healthy subjects in an article written by S.A. Kharitonov et. al, 2003. 