first off, glad you brought this over to this section. I was going to suggest that, and forgot to.
I have a few thoughts about this type of situation. It's definitely something that comes up fairly regularly.
As I suggested in your other thread, if your friend isn't training or eating well, his gains will only be mildly enhanced, regardless of what doses he's using . And he certainly won't be able to retain them when he comes off the drugs. The best advice he could possibly receive is to get his training and diet in order, for 5-10 years, in my opinion, and then reconsider this path.
THAT BEING SAID... here's what's more likely to happen. Everyone around your friend will tell him this is a bad idea, but he'll do it anyway. He'll see some results from his first cycle, but he'll lose all of his gains during PCT, and he'll be back at his starting point. So he'll run another cycle, probably with an added drug, or higher dosing. Then he'll do another. He'll keep doing this, he'll never be happy with himself, and he'll always be looking for shortcuts. He'll likely stop doing PCT early on, and just stay on the drugs for the rest of his life, because he can't deal with the time off of them. He'll feel shitty, depressed, and decide that the only way he can feel normal is when he's on drugs.
Sorry if this sounds fairly grim, but we've seen it so many times in these threads. It's a bummer. I hope that's not what happens. Do what you can to convince your friend not to start.