| abstract |
This invention is directed to a method for preventing or treating neuropathic pain and cluster and migraine headache-associated pain comprising administering to a subject in need thereof a therapeutically effective amount of an enantiomer of Formula (I) substantially free of other enantiomers or an enantiomeric mixture wherein an enantiomer of Formula (I) predominates: n n nwherein phenyl is substituted at X with one to five halogen atoms independently selected from the group consisting of fluorine, chlorine, bromine and iodine; and; R 1 and R 2 are independently selected from the group consisting of hydrogen and C 1 -C 4 alkyl; wherein C 1 -C 4 alkyl is optionally substituted with phenyl (wherein phenyl is optionally substituted with substituents independently selected from the group consisting of hydrogen, halogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, amino, nitro and cyano). |