Why Wouldnt you talk about this on our forum???I think its a pretty legitimate question . And if his friend is overdoing it ....maybe someone has some important input.
I would say , IMO , that all drugs have thier point of abuse . I see posts of people putting tons of amounts of gear into thier system for 6months to a year . Id say thats just as dangerous as doing a hardcore recreational drug for an for an extended period of time .
Now , im wondering exactly how much he's doing . If he's to the point of losing weight it means he's using everyday....not eating.....and most likely not sleeping much . Obviously diet and sleep are #1.........so he's stupid to run anything . And most likly has a problem if he's doing it like this for 5 weeks .
Now i normally wouldnt open up like this because theres always some a-hole who thinks there better than you becuase they dont use drugs.....yet they are on 10grams of test for 3 years straight .

If your on this board id say you most likely use drugs...illegal drugs.....weather to get high or grow muscles .
But my point......ive done a bit of coke on gear....but basically on the weekends , nothing for days on end . My diet stayed pretty much in check , aside from the drinking that goes with it. I've tried most all drugs , and i party pretty hard , in moderation! . You just gotta enjoy life , take care of your responsibilitys , and forget about everyone elses BS .
My advise to you...sounds like he's a good bud....find out how much he's using , and take it from there . PM mee if you want some links to forums that might have better answers on this .
My advise....find out how much he's doing