Objective-Depressed mothers of children with psychiatric illness struggle with both their own psychiatric disorder and the demands of caring for ill children. When maternal depression remains untreated, mothers suffer, and psychiatric illness in their offspring is less likely to improve. This randomized, controlled trial compared the interpersonal psychotherapy for depressed mothers (IPT-MOMS), a nine-session intervention based on standard interpersonal psychotherapy, to treatment as usual for depressed mothers with psychiatrically ill offspring.Method-Forty-seven mothers meeting DSM-IV criteria for major depression were recruited from a pediatric mental health clinic where their school-age children were receiving psychiatric treatment and randomly assigned to IPT-MOMS (N=26) or treatment as usual (N=21). Mother-child pairs were assessed at three time points: baseline, 3-month follow-up, and 9-month follow-up. Child treatment was not determined by the study.Results-Compared to subjects assigned to treatment as usual, subjects assigned to IPT-MOMS showed significantly lower levels of depression symptoms, as measured by the Hamilton Depression Rating Scale, and higher levels of functioning, as measured by the Global Assessment of Functioning, at 3-month and 9-month follow-ups. Compared to the offspring of mothers receiving treatment as usual, the offspring of mothers assigned to IPT-MOMS showed significantly lower levels of depression as measured by the Children's Depressive Inventory at the 9-month follow-up.Conclusions-Assignment to IPT-MOMS was associated with reduced levels of maternal symptoms and improved functioning at the 3-and 9-month follow-ups compared to treatment as usual. Maternal improvement preceded improvement in offspring, suggesting that maternal changes may mediate child outcomes.Major depressive disorder is a common, debilitating illness, affecting one of five women in their lifetime (1). Many women who suffer from depression are mothers. Because of shared genetic and environmental risk factors, the offspring of depressed mothers have a two-to fivefold increased risk of experiencing a psychiatric illness relative to the offspring of unaffected parents (2,3). In a negatively reinforcing cycle, depressed mothers whose children develop psychiatric illness find it difficult to juggle the mental health treatment needs of multiple affected family members, often putting their own care behind that of their children (4). Consequently, maternal depression remains untreated (5), with attendant impairment in a range of functions that have been implicated in both poor maternal and child outcomes, including maternal interpersonal functioning (6,7) and parenting skills (8). Even when children receive psychiatric treatment, the likelihood of favorable responses decreases in the face of persistent maternal depressive symptoms (9).Depressed mothers with psychiatrically ill children present both challenges and opportunities. On one hand, if maternal illness is untreated, it is likely to have a negative e...