hgh?

Can someone tell me the difference between these two kits? I need to know for dose reasons. I know to take 4iu per day, but i bought the 5mg kit. So, should i still take 4iu or 1/2 of that. Humatrope 2mg 4iu 1.33ml Humatrope 5mg 15iu 15ml Is this saying one is more potent than the other? also, how much do u get once you mix this stuff? Thanks!