Patent ID: 8618156

Claim:
A method of treating pain in a patient diagnosed with a pain disorder comprising orally administering to the patient an effective amount of a pharmaceutical composition comprising at least one pharmaceutically acceptable additive or adjuvant and an active ingredient comprising a crystalline form of (1r,4r)-6â€²-fluoro-N,N-dimethyl-4-phenyl-4â€²,9â€²-dihydro-3â€²H-spiro[cyclohexane-1,1â€²-pyrano[3,4,b]indol]-4-amine having an X-ray powder diffraction pattern comprising characteristic peaks at about 18.3Â±0.2 degrees 2Î¸, at about 26.3Â±0.2 degrees 2Î¸, and at one or both of about 7.8Â±0.2 degrees 2Î¸ and about 31.6Â±0.2 degrees 2Î¸.