From searching and reading on the Internet (you can do this too), it seems that there is no real consensus as to how much of either of the meds you mention is fatal. I did read where Atvian is most likely not fatal, even at high doses, but this was just anecdotal. I read that alcohol can make trazodone more fatal, but it's far from certain the way I read all the information. There are too many variables I believe, such as weight, age, how long and how much you have been taking, all kind of things. There were numerous citations that you can do some real damage to yourself by taking too much, short of a fatal dose. I wouldn't do it. Too risky. You may end up a shell of yourself, a vegetable, still alive and not able to do anything to get out of that predicament.