My GI dr gave me some samples when I told him I was taking mag-citrate (and told me to stop taking the mag-citrate), and it worked pretty good for me. The few times I've used it were when I felt the attack coming on, so I could empty myself as much as possible before becoming so swollen that my intestines wouldn't let anything pass. But if I'm already in a full attack, I haven't used it because I've been afraid I might cramp but not be able to go until the swelling passes, usually after I've slept, then drank a coffee after waking up.
I don't know if that would actually happen (laxative-caused cramping while intestines are too swollen to let anything pass), but I get so nervous about making things worse when I'm in a full-blown attack that I just drink liquids and take pain medicine until I can get the sleep that usually brings down the swelling enough so I can at least go a little.
It's "clear" when mixed with water, but the water has a different "sheen" to it, sorry that's weird, I can't figure out a better way to describe it
And it has a little bit of a medicine'y or chemical taste, so I hold my breath while drinking it as quickly as possible.
So if you can feel when your attacks are building up, and hope to move things along before you're too swollen, it's not that bad, and does not cause cramps or "run to the bathroom" like other laxatives.