The LD50 is a generally useless piece of information when it comes to actually dosing a substance. This is a fairly rough number, but a dose of 150mg or more is typically considered fatal (although I want to emphasize that death could occur at a significantly lower dosage, ESPECIALLY if combined with other drugs.)
I'm moving this to Basic Drug Discussion.
->bdd
^ To the above posters that's fucking gross I can't imagine the taste in my mouth in the morning. When I take just one pill that taste always get's to me.