"Bromhexine is a mucolytic drug used in the treatment of respiratory disorders associated with viscid or excessive mucus.[1] It was developed in the research laboratory of Boehringer Ingelheim in the late 1950s as an active ingredient for pharmaceutical use, patented in 1961, introduced in 1963 under the trademark of Bisolvon® and came into medical use in 1966."
Source: https://en.wikipedia.org/wiki/Bromhexine
Bromhexine hydrochloride is a hydrochloride resulting from the reaction of equimolar amounts of bromhexine and hydrogen chloride. It is used as a mucolytic for the treatment of respiratory disorders associated with productive cough (i.e. a cough characterised by the production of sputum). It has a role as a mucolytic. It contains a bromhexine(1+).
Source: https://pubchem.ncbi.nlm.nih.gov/compound/Bromhexine-Hydrochloride