Originally Posted by mehman5000
how much do i need to take?
He doesn't know, it's only hearsay.
There's no easy way to do this, no one can sell you the "magic pill" to make you pass a drug test, so stop looking for it.
As said before, the best you can do is try to exercise and drink a lot of water in order to flush it out and dilute it in your piss. If you drink TOO much water, though, some drug testers will know what you're up to, so don't go overboard.