Pharmaceutical compositions and medical uses of comprising either (R)-1-(4-{3-[4-(6-fouoro-benzo(d)isoxazol-3-yl)-piperidin-1-yl]-propoxy}-3-methoxy-phenyl)ethanol of formula I: or a pharmaceutically acceptable salt thereof, or (S)-1-(4-{3-[4-(6-fouoro-benzo(d)isoxazol-3-yl)-piperidin-1-yl]-propoxy}-3-methoxyphenyl)ethanol of formula II: or a pharmaceutically acceptable salt thereof.