I think that not putting one's self in riskier situations is a factor, too. Don't go to the local Pick up bar, don't look up people you've had a relationship in the past to "reconnect ", etc. Maybe easier said than done during mania but simply not putting yourself in the environment is significant.

For example, I have spent thousands on manic shopping sprees. It was as good as done as soon as I went into one of my favorite retail shops.