There's quite a bit of medicine that "works" but the specifics of why it work isn't well understood, especially in mental health. One of my friends who works in the mental health pharmacology field told me one of the challenges with the field is measuring the efficacy of those drugs. What do you do? Do you ask someone if they are feeling better or happier? Is that trust worthy? Or is it too fuzzy? Was it the drug that did it or something else? In that regard, they face similar challenges as the social sciences.
