I was in the was in the same boat last week. I wasnt able to find the LD50 but i do know from wikipedia that in austrailia they take 50 ml in a regular does so it may be a lil bit higher. But you would be safer w/ robo.

*edit* yeah my friend jsut informed that doxylamine is the same thing in triple C's and is horrible for your liver. I knew that but forgot that it was doxylamine. I would stay away from it.