See alcohol / alcoholic, drugs and drunk
If you dreamed of you or someone else overdosing on drugs, it is a serious warning that your behavior has become self-destructive. You need to take a more positive approach to dealing with your problems and set your eyes on your future, or you will end up sabotaging yourself and not getting what you want.
One is getting too much of something.
The dream symbol you are looking for is absolutely there, try searching the symbol one by one.