CBT is the most effective treatment for depression, with up to 80% of patients showing improvement
CBT has been shown to have long-lasting effects on reducing symptoms of depression
CBT can be used as an alternative or alongside medication
cbt may not be affective for everyone because there are individual differences in patient's experiences of depression
cbt may not be as effective as other treatments

treatments aimed at the biological causes may be more effective
low levels of the neurotransmitter, serotonin, are a biological cause of depression and so patients with major depression are prescribed with antidepressants which target serotonin
SSRIs found to be effective in treating depression
