The invention relates to solid forms of (1r,4r)-6'-fluoro-N,N-dimethyl-4-phenyl-4',9'-dihydro- 3'H-spiro[cyclohexane-1,1'-pyrano[3,4b]indol]-4-amine and sulfuric acid such as (1r,4r)-6'- fluoro-N,N-dimethyl-4-phenyl-4',9'-dihydro-3'H-spiro[cyclohexane-1,1'-pyrano[3,4b]indol]-4- amine sulfate or hemi-sulfate, in particular crystalline forms and/or amorphous forms thereof, pharmaceutical compositions and medicaments comprising these solid forms, the use of these solid forms as well as to a process for obtaining them.
