constipation
"Took 2 tablets at 9PM, went to sleep at midnight and woke up in excruciating pain at 3am! The times now is  3:50AM and I'm writhing in pain, shaking and feeling like I'm going to vomit. I rushed to the toilet thinking I was going to have a bm only to find I didn't  it was only gas. I'm never using these again. I hope this cramping pain and terrible nausea will subside soon as I can't sleep."