Polyethylene glycol 3350 with electrolytes
"I was absolutely dreading taking this.  I have a huge fear of having to take any pills, or medicines which is why I won't be having the sedation tomorrow for the colonoscopy - wish me luck.  Anyhow I braved it and started taking the first litre at 630.  Nothing happened until 8 and I thought it wasn't going to work but now seems to have started :/  Similar experience to others but no cramps thankfully - I'm just going to take the last half glass - its now 8:15.  Its fine.  I paced it - drank a glass straight down about every 20 minutes and had a full glass of water in between.  If I'm not up all night pooping I'll be up all night peeing!  It's not bad and you can't taste it if you drink the glass quickly - good luck moviprepers"