get immediate help if you develop unusual or severe stomach pain. especially with bloody or black stools. the most common side effect is diarrhea. sometimes severe. if it's severe, stop taking linzess and call your doctor right away. other side effects include gas, stomach area pain and swelling. i'm doing it all. and i said "yes" to linzess. ask your doctor about linzess. ♪ ♪ [ referee whistle sounds ] ♪ sport dr[ cheering ]s when you need the fuel to be your nephew's number one fan. holiday inn express. we're there. so you can be too.