Was exaggerating a little with the "killing" thing. (I weigh 85kg and first took it at the 75 kg mark at first, but then later took it at the 100kg (0.23 mg/kg) mark no trouble.
There was a guy who posted here a few weeks ago who took a whole 600kg tube at once -- said he recovered, but really scared himself with it and had difficulties with eyesight and went to A&E. As long as you don't go overboard nuts like that guy did it'll prob be OK if you're not being exactly as precise as you are trying to be.
Not sure though that IVM was right for me and at the minute back again with the horrible taste of PZQ!