Patent ID: 8536191

Claim:
A form of nalbuphine HCl selected from the group consisting of Form C, Form D, Form F, Form G, Form H, Form I, Form K, Form U and amorphous Form Z; wherein: Form C has PXRD °2θ peaks at about 9.76, about 15.22 and about 19.51; Form D has PXRD °2θ peaks at about 6.22, about 11.11, about 13.15 and about 14.89; Form F has PXRD °2θ peaks at about 7.89, about 12.9, about 14.22 and about 15.76; Form G has PXRD °2θ peaks at about 8.05, about 10.93, about 11.32, about 15.70 and about 17.41; Form H has PXRD °2θ peaks at about 11.23, about 15.37 and about 18.91; Form I has PXRD °2θ peaks at about 11.64, about 13.38, about 14.64 and about 15.57; Form K has PXRD °2θ peaks at about 10.98, about 11.58, about 13.35 and about 15.36; Form U has PXRD °2θ peaks at about 12.18, about 13.04, about 13.52 and about 19.04; and amorphous Form Z has a glass transition temperature of 48° C.