Addressing the questions of: 1) Do anxiety and mild depression carry sufficient halachic weight to warrant violating Shabbos? 2) Is severe depression considered a pikuach nefesh situation? 3) Is prophylactic prevention of severe depression considered a pikuach nefesh situation? 4) Is a severely depressed person considered a shoteh? Applications include Shabbat, kashrut, contraceptives and abortion. Class given for CME credit to physicians.