Which intestinal disorder is characterized by the colon overresponding to normal stimuli, which causes alternating patterns of constipation and diarrhea?

Irritable Bowel Syndrome or IBS for short is known to be a common disorder that affects the colon.  IBS causes alternating patterns of constipation and diarrhea. In treating IBS, it requires dietary changes and some medications, especially antibiotics. Some known medications made for IBS patients are known as Lotronex and Amitiza.