Patent ID: 8173155

Claim:
An adhesive patch consisting essentially of a backing layer and an adhesive layer, wherein: said adhesive layer consists of: (i) 10 to 40 wt % ambroxol or a pharmaceutically acceptable salt thereof, (ii) 9.8 to 15.4 wt % of a hydrocarbon rubber selected from styrene-isoprene-styrene block copolymer and a styrene-butadiene-styrene block copolymer, (iii) 13.0 to 20.5 wt % of polydimethyl siloxane, (iv) 5 wt % of at least one plasticizer, (v) 3 wt % of at least one absorption enhancer, and (vi) 29.3 to 46.1 wt % of at least one tackifier resin; and wherein the skin permeability rate of ambroxol is at least 16.3 μg/cm 2 /h.