The present invention relates to phenalkylamine derivatives of the formula (I)or a physiologically tolerated salt thereof.The invention relates to pharmaceutical compositions comprising such phenalkylamine deriva-tives, and the use of such phenalkylamine derivatives for therapeutic purposes. The phenal-kylamine derivatives are GlyT1 inhibitors.本發明係關於式(I)苯烷胺衍生物或其生理學上容許之鹽。本發明係關於包含此種苯烷胺衍生物之醫藥組合物,及此種苯烷胺衍生物用於治療目的之用途。該等苯烷胺衍生物為GlyT1抑制劑。