Linaclotide
"I was reluctant to try Linzess and I wish I'd listened to myself! horrid pain for hours, cramping, stomach pain, belching, lightheaded, chills, and now spasms, definitely a setback in my GI saga. I'm irritable and completely out of sorts too - my poor family!  At one point I thought I'd faint and need urgent care. I'm lucky my kids were here to help. I took it as directed, so that's not the issue. I'm just posting in case anyone else experiencing a negative reaction is wondering if they're alone. You're not. It's not for everyone."