it depends on what strength they were I have taken 7 or 8 of 100 mg at a time and all it does is make you really sleepy. if you overdose on trazodone all it will cause is excessive sedation. However there have been cases where people have committed suicide on trazodone. but to achieve this you would have to take several months worth of the strongest trazodone they make, this is why they prescribe this medicine to suicidal people who also need a sleep aid.