That would not be good. Lasix is bad shit. You will retain some water while on HGH but what is that hurting? You can make sure to not use to much sodium. That will help a bit.
How many iu of GH are you using? If you use too much too fast you will retain a lot more water and experience a lot of the sides of GH. Starting low and ramping up slowly can help you avoid the water and other sides.