The present invention provides a method of treating pain and pain related conditions by administering to a patient in need thereof, a therapeutically effective amount of a slow release Tapentadol Hydrochloride and therapeutically effective amount of a second analgesic, wherein the second analgesic is tramadol, gamma- aminobutyric acid (GABA) analogue or an NSAID. The present invention further provides a pharmaceutical composition comprising a therapeutically effective amount of a slow release Tapentadol Hydrochloride and a therapeutically effective amount of a second analgesic, wherein the second analgesic is tramadol, gamma-aminobutyric acid (GABA) analogue or an NSAID.
