Relaxant effect of Pimpinella anisum on isolated guinea pig tracheal chains and its possible mechanism(s)

In the present study the relaxant effects of essential oil, aqueous and ethanol extracts of this plant in comparison with both saline and theophylline were studied by a more standard
method (Martin et al., 1994). In addition the anticholinergic effect of essential oil of P. anisum in comparison with atropine was also studied.