In general, it is impossible to answer such a question. Too many variables and random factors would have to be taken into account. Such a dose is potentially fatal, but 10 out of 12 people survive a dose of about 6g of clomipramine. I generally advise against it, you can get a heart attack and stop blood circulation for a while, or lose consciousness and choke on vomit and ultimately not die but end up in a vegetative state.