IF in human bronchi determined following and during the continued presence of indomethacin, AA-861, pyrilamine, and the combination of indomethacin and AA-861 did not affect IF. However, indomethacin, AA-861 and the combination of indomethacin and AA-861 significantly decreased ACh-elicited force generation, *P < 0.01; # P < 0.05; $ P < 0.05, respectively compared with control. There is no significant difference in total force between the different groups. Data are the mean ± SE. Mean of 17 experiments, with tissue from 17 individuals. PSS containing 1 μM AA-861 or 10 μM pyrilamine resulted in a significant decrease in PSS buffer basal tone in ASM (P < 0.01, Data not shown). However, PSS buffer with 10 μM indomethacin had no significant effect on PSS buffer basal tone in ASM (Data not shown).