Magnesium citrate
"I wish very much I could give MC a glowing review like so many other reviewers. Unfortunately I can't, as it's been hit or miss for me. I was given MC several years ago to clear me out before surgery. Back then it worked, actually a little too well. I started going about 20 min after drinking the bottle (10 oz lemon lime flavor, not too bad) and I was still having spells of poop water 48 hrs later. This time is a different story. I'm in the middle of a bout with severe acute constipation and was given MC in the ER after my usual home remedies (Miralax, Senakot S, Fleet enemas) didn't work and I got desperate. It's been 8 hrs. since drinking the MC and nothing has happened except some tummy rumbling. So I'm still desperate :("