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-dime-thyl)-4-phenyl-4’,9’-dihydro-3’H-spiro[cyclohexane-1,1’-pyrano[3,4-b]indol]-4-a mine or a physiologically acceptable salt thereof.本發明係有關一種用於每日兩次、每日一次或較低頻率投予之藥學劑型,其含有6’-氟-(N-甲基-或N,N-二甲基)-4-苯基-4’,9’-二氫-3’H-螺[環己烷-1,1’-哌喃並[3,4-b]吲哚]-4-胺或其生理上可接受的鹽。