Okiemom, I used Miralax for my prep last month. Tip: drink the mixture through a straw. You can suck it right into the back part of your mouth, past your taste buds so it's easier to take. This works will for any liquid you don't care for the taste of.
My prep was clear liquids the day before, some Dulcolax tabs in the afternoon and the miralax cocktail starting at 5 PM. I drank it all in the recommended time, and had real issues with urgency and incontinence, plus I threw up a couple of times after the other end dried up. Next time, I'd move the whole prep back a couple of hours and drink the "cocktail" more slowly, as I felt and my doctor agreed, that the problems were from drinking it too fast.
The mag citrate does sound like a bit of overkill, and I think it's the nastiest thing I've ever taken for a prep. No, it isn't milk of magnesia. It's a bottle of a clear liquid. The taste is a bit like over-carbonated, slightly salty 7-up. But for me, it burns like fire coming out the other end. I'll do any prep before I drink that stuff again.
Left-sided UC diagnosed 2001. Taking Colazal and Imuran, Remicade infusions and moving into remission. Finally off steroids after four years!
Now in remission for almost two years. Remicade has been my wonder drug.
"If you spend your time second-guessing your past decisions, you'll never have time to enjoy today."