Tasuldine is a mucolytic agent, which decreases the sialomucin content of mucus, improves mucociliary and cough clearance[1].
References
[1] App EM, et al., The effect of tasuldine, a bronchosecretolytic agent, on mucus rheology and clearability and the interaction with acetylcholine in ferrets. Pulm Pharmacol Ther. 1997 Oct-Dec;10(5-6):271-6. DOI:10.1006/pupt.1998.0103