Why can't you overdose on Quetiapine?

[autumnal]

I have tried a few times and all that happens is I get knocked out for a few hours and feel dazed for days! My heart rate goes higher and I go dizzy, can't really remember much after that tbh. Think the most I've taken is 5000mg and I've thrown in some paracetemol and ADs and still nothing. I've given up using it as a ctb method, maybe I do use to need more....

You don't need to use more. You need to realise that it's basically impossible to overdose on.