I do not intend to be rude but spreading information that could get someone killed is not looked upon lightly!!
You are new --- okay 1. dont IV coke as it is caustic and prone to giving abcesses if/when you miss a vein, than you gotta go to the doc and snitch on yourself or risk losing a limb!
50mg in general is a safe place to start -- so get a scale weigh .1 broken up fine and do the small half (IF YOU MUST PERSIST).
You are getting shamed for recommending a near/lethal dose of IV cocaine on a HARM REDUCTION FORUM -- and again I dont mean to shame you but common sense, if the cocaine is 50% pure you are doing half as much as you think, if its 10% a tenth, than someone with 85% or something reads what you posted and thinks they can do 300 --- its no bueno!
like
@jose ribas da silva said if it isnt good coke you shouldnt IV it anyways --- if it isnt drawing up easily and clear that is a problem for YOUR VEINS. (Most coke doesnt now days)
Just sniff the shit since you new to this world