I struggle with impulsiveness so much no matter what episode I'm in. Usually when I'm depressed it's going on shopping sprees and when I'm manic it's doing dangerous adrenaline-pumping activities (jumping off trains, climbing buildings, stuff like that).

For the shopping thing, something I found that helps is asking a friend to go shopping with me because I fear they'll judge me if I buy a lot of stuff. (Sometimes a friend will enable you though, so be careful.) I also "ban" myself from stores (for me it's Target and CVS and any makeup store) and only go when absolutely necessary, or if I want to buy something that I've thought about for a long time. I try not to make any big purchases unless I've thought about it for a long time (not super great at that though). And when I feel like I absolutely HAVE to shop, I go to a thrift store because at least that does less damage to my wallet.

As far as doing dangerous things when I'm manic... what I really want at those times is the adrenaline, so I try to do safer things like drive really fast in my car (but out on country roads) or go to an amusement park if I have time and can afford it... this one I have a harder time coming up with alternatives for