There are some studies that suggest that antidepressants are as effective as placebo for mild to moderate cases (which is to say they can be not very effective). Regardless of one's view on this (and one might work with doctors or other health advisors to make a good decision about that), a lot of the basics of exercise, diet, cultivating an attitude of gratitude, and other things like that can really help cases of people who struggle with emotional or mental ills!