Your choice. The way I see it, it's a different thing to take an informed choice for yourself than it is to suggest it to another.
I'd have to get up to check side effects but they relate to liver function I believe... anyways 9*500mg seems okayish. The labelled max dose of paracetamol here is 8*500mg I think.
I also know where your heading with bodyweight, but this is a tricky one. My background is in physics/math/eng/IT - so I tend to argue that the world is not always as simple as it might appear. We can only truly tell be testing.
For example... if both me and a girlfriend take four tablets of something... and I weigh twice as much as her (I'm 100kg currently so it's possible) - blood concentration over time will be different, perhaps based on lean body mass, speed of absorbtion, whether the substance is fat soluble or not etc etc.
In many cases though... it'll all go out the same way. And also... I think some of our organs are not that much different in size. So yeah. I'd not always be so confident that I can take twice as much as a girl. I sure know that I can drink more, but other things... who knows.
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