Help me !! to Help My friend!!!

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i was reading an article for Health calss today and i juss found out that GHB is a type of Liquid exactsy or sumthingm like that and they porvide them at parties and such..well my friend had consumed it a year ago thkning it was a bottle of water and had passed away from it now my other friend is gettin into it.. how do i tell her to stop becasue she thinks she wont over dose but one day it can be fine and the next ur body can shut down.. what should i do guys ????