When Should I Stop Taking Spironolactone and Doxycycline Before Mommy Makeover?

There is probably no reason to stop spironolactone if blood metabolites are normal. Doxycycline can stain the skin if concurrent liposuction is to be performed. Again check with your surgeon.

I don't have specific concerns regarding either of these medications, and I always review medication lists with our anesthesia staff prior to surgery to make sure they are comfortable with the medications as well.

I think you are OK to continue your medications.   You may want to have your labs checks in the rare chance the spironolactone effects your electrolyte levels.   Best wishes for a speedy recovery