The present invention provides new pseudo-polymorphs of the hemisuccinate salt of 2,4,6-trifluoro-N-[6-(1-methyl-piperidine-4- carbonyl)-pyridin-2-yl]-benzamide which are useful in pharmaceutical compositions, for example, for the treatment and prevention of migraine headache.本發明提供2,4,6-三氟-N-[6-(1-甲基-六氫吡啶-4-羰基)-吡啶-2-基]-苯甲醯胺之半琥珀酸鹽之新穎偽-多形體,其可用於醫藥組合物,例如用於治療及預防偏頭痛。