Bronchodilating activity of some traditional medicine formulations on the in vitro tracheal ring test model

The efficacy of seven reputed bronchodilating traditional medicine formulations were studied on the in vitro model of tracheal chain preparation using rabbit and guinea-pig. A new carbachol-induced model was introduced and comparison of its eficacy with normal preparation showed more promising results. Three formulations were found to produce significant relaxation as much as 127 12 Percent and 108 18 Percent in rabbit and guinea-pig models respectively.