I took niacin (500mg/2x/day), and dropped 20lbs of water from GH edema in 2 weeks, and got immediate relief from all my GH induced sides. Niacin was the only change I made, other than dropping GH, so I'm pretty sure that was what did the trick for me.
I stopped the niacin after that initial drop, and since have shed about 2-3 more pounds of retained water over a 3 week period.