If they are depressed and on meds & in therapy, I'd say the meds aren't working. He/she either needs new meds or an add'l med. Meds aren't the whole story, so perhaps there is an underlying issue that needs to be resolved in therapy. If the current treatments aren't working, there needs to be a change. No amount of love & support will help if an underlying issue isn't being addressed.
fyi...I'm going to Grad school for Mental Health Counseling
Me- Bi-female-early 40s- Single Mom to 2 young boys
Exploring & having fun for the time being after a long & unhappy marriage
There is no failure. Only feedback. -Robert Allen