Comparison: Treatment outcome measures of subjects diagnosed with Major Depressive Disorder will be compared to treatment outcome measures of subjects diagnosed with Major Depressive Disorder and an Alcohol Use Disorder following the initial 12 week citalopram treatment period. This comparison will show whether having a co-morbid alcohol use disorder affects recovery from depression. In addition, alcohol use data of depressed subjects who demonstrated a positive response to anti-depressant treatment will be compared with alcohol use data of depressed subjects who did not have positive treatment outcomes. This comparison will show whether recovery from depression is associated with improvement in the co-morbid alcohol use disorder.