Psychotropic drugs have numerous potentally lethal side effects and there doesn't even have to be an overdose involved to have them occur.

If there is an overdose it may be unintentional---not keeping track of the last time you took a dose or thinking that gee, one pill almost did the trick, howzabout this time I take two?

Or well, that didn't work, let me try this. And maybe a glass or two of wine would help me relax, since all the stuff I just took isn't doing the job.

Frankly, Anna Nicole looked a bit shlogged in recent interviews. I can understand her desire to numb the pain of her son's death and I think we can be pretty certain that she was medicated in an attempt to do so but perhaps this was a factor in her own death?