Described herein are compounds and pharmaceutical compositions containing such compounds that modulate the PGD
2
activated chemoattractant receptor-homologous molecule expressed on TH
2
cells (CRTH2). Also described herein are methods of using such CRTH2 modulators, alone and in combination with other compounds, for treating respiratory, cardiovascular, and other PGD
2
-dependent or PGD
2
mediated conditions or diseases.