 bloodier 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. Learn more at Linzess.com or call 1-800-LAN-ZESS. KFNX Cave Creek. I'm Jerry Sheridan, your Republican candidate for Maricopa County Sheriff. I want to be your sheriff. Open borders are out of control, bringing crime and dangerous drugs like fentanyl into our communities.