Intravenous administration of Meseclazone and other nonsteroidal anti-inflammatory drugs induced a dose-dependent inhibition of bronchoconstriction. This causing the following order of descending potency: isoproterenol congruent to indomethacin greater than fenoprofen greater than tolmetin greater than aspirin greater than naproxen congruent to ibuprofen greater than phenylbutazone greater than diflunisal greater than Meseclazone greater than 5-CSA. Meseclazone inhibits collagen-induced aggregation 1 and 4 hr after oral administration[1][2].