Hello Alana, your friends situation I know all to well personally from myself. Until a physician is able to prescribe the right combination to an individual, there is alot of up and down time.. and some very low times. And even medications I have found does not heal depression totally. The best thing I did for myself was to join a depression support group here in my city. It was hard, I didnt want the labels, ect.. but am so glad that I did. All the messages in ones mind, the feelings one has about self while in a depressive stage others in the same situation feel as well. Like this forum, just hearing others speak on how they felt made me feel not so crazy and alone. I would have at the community resources and see what is available out there, I found mine through mental health resources. What a world of difference this support has made to my life.
I hope your friend finds peace.. its a tough place to be in for your friend, and all supporting!
LTF