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In bowel prep for colonoscopy, how long does it take for polyethylene glycol 3350 to work?

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It can start working in as little as 30 minutes or take a few hours.... I wouldn't roam too far away from your bathroom though. It comes on pretty severely and suddenly.

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Several hours. Sometimes it takes several doses. It will completely clean your GI tract by morning.

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Usually after your 2nd or 3rd cup full, it will kick in. Good luck!

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I would say several hours because it entails taking it close to 3 hours before the actual day. I have found these instructions that you may find useful; http://gastrodr.drbhavindave.com/procedures/colonoscopy-prep/visicol/

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I think it depends on how your bowels are to begin with. I was a little constipated. Took the 4 ducalax @ 5:15 pm. Started the miralax solution @ 6:25 pm. I went to the bathroom a couple of times and had small solid pieces. Then about 8:30 I threw up 3 times, so slowed down on how fast I was drinking. Finally things started moving right before 11 pm about the time I finished my solution. I decided I better make extra to make up for what I brought back up. So made another 16 oz with 3 scoops of miralax. Fortunately I had another bottle. So I will probably be up most the night.

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took 2 Ducalax pills at 5:25. Started drinking 8 oz of the stuff at 6:00 and did so every 10 minutes. I was in severe pain and discomfort, most likely due to rapidly drinking it as they recommended. I slowed down and started drinking it about 20 minutes apart. I did not go until 4 hours later. After I was done with the gallon, I took 2 more Ducalax pills. Most people I talked to said it took them 1 hr before they went...but NOT me. I used a heating pad to help keep my mind off the discomfort as well.

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