The present invention provides anti-nerve growth factor (NGF) antibodies that contain an IgG4 constant region comprising a stabilizing hinge region mutation and wherein the antibodies exhibit an unexpectedly long serum half life in cynomolgus monkeys. Pharmaceutical compositions comprising the anti-NGF antibodies, nucleic acids encoding the NGF antibodies, host cells for expressing the NGF antibodies and methods of using the antibodies for treating NGF-related diseases or conditions are also provided.本發明提供一種含有包含穩定鉸鏈區突變之IgG4恆定區的抗神經生長因子(NGF)抗體,且其中該等抗體在食蟹獼猴中展現極長血清半衰期。亦提供包含該等抗NGF抗體之醫藥組合物、編碼該等NGF抗體之核酸、表現該等NGF抗體之宿主細胞及使用該等抗體治療NGF相關疾病或病狀之方法。