What is the penalty for margin trading?

I'm curious, could you elaborate on the consequences or penalties that one may face when engaging in margin trading? I understand it's a Leveraged trading strategy that allows investors to borrow funds to increase their potential profits, but I'm interested in knowing what risks and potential fines or penalties are associated with this type of trading. Is it possible to lose more than one's initial investment, and are there specific rules or regulations in place that govern margin trading and the penalties for misusing it?