The invention relates to a pharmaceutical dosage form for administration twice daily, once daily or less frequently, which contains 6'-fluoro-(N-methyl- or N,N-dimethyl)-4-phenyl-4',9'-dihydro-3'H-spiro-[cyclohexane-1,1'-pyrano[3,4,b]indol]-4-amine or a physiologically acceptable salt thereof.本發明係關於每日施藥兩次、每日施藥一次或施藥頻率更少之醫藥劑型,其含有6'-氟-(N-甲基-或N,N-二甲基-)-4-苯基-4',9'-二氫-3'H-螺旋[環己烷-1,1'-吡喃並[3,4,b]吲哚]-4-胺或一其生理上可接受之鹽類。