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Effect of ambroxol on rabbit eustachian tube surfactant.

The effect of ambroxol administration on phospholipid and phosphatidyl-choline contents of rabbit eustachian tube and lung washings and on [14C]-choline incorporation by rabbit eustachian tube and lung tissue has been studied. Despite minor differences, the drug exerts the same activating effect in both locations. The results add a further piece of evidence to the several similarities existing between the lung surfactant and the surface-active substances present on the eustachian tube.