NO, it won't “Rip your insides out”
The hardest part is the taste, and that seems to have become less intense in recent year
Still there is some chance you could throw kit up while you are trying to drink it. 10 minutes after you drink it, the sickly sweet/bitter aftertaste is gone, or mostly gone.
Here is what I have found to be the best way to get it down:
Leave it in the fridge overnight
Make up a large stadium cup of ice water.
Put a pillow in front of the toilet
Kneel on the pillow.
Take a sip of magnesium citrate
Then immediately a sip of water.
Count to 10
Repeat.
If you feel like you are having trouble wait a 50 count and take some deep breaths.
When you get to the end of the magnesium citrate, take a couple more sips of the water before standing up.
Over the next 20 minutes drink the rest of the stadium cup of water.
Within 20m minutes or so after that, you will hear, and eventually feel some tummy rumblings.
It should not be too uncomfortable. There may be a touch of nausea, but not usually.
Stay within a few steps of the toilet, because once things start to happen, it can go pretty fast.
From the time you take the last sip, it will take at least 20 minutes, but not much more that 2 hours.
Once you feel it coming, get to the toilet and don't hold it back!!!
LET IT COME OUT, BECAUSE IT'S GOING TO DO SO ANYWAY!
When it's ready not when you are!
It will peak in about 3-4 hours, and be essentially worn off in 6-7 hours
If it's a prep for a colonoscopy or Barium enema. you will be doing it on an empty stomach and you will follow after about 3-4 hours with 20mg bisacodyl (Generic Dulcolax) The standard adult dose is 10-15 mg. On an empty stomach that laxative will take about 4 hours to kick in, and kick in it will
https://www.howtopronounce.com/bisacodyl
Bisacodyl acts ONLY on the large intestine.
The thinking is that the magnesium citrate will by then have pushed the contents of the small intestine down into the large intestine where the bisacodyl will move it out.
The whole process takes about 8-12 hours.
Generally it is not as bad as it is often made up to be!!