"Anger attacks" are outbursts of anger which are accompanied by intense autonomic arousal and are clearly inappropriate to the situation in which they occur. The Anger Attacks Questionnaire, designed to assess these attacks, was administered to 164 consecutive patients (78 men and 86 women; mean age, 40.5 +/- 11.0 years) diagnosed as having major depression with the Structured Clinical Interview for DSM-III-R. These patients were treated openly with fluoxetine, 20 mg/day for 8 weeks, and the prevalence of anger attacks was assessed before and after treatment. At baseline, 64 (39%) (26 men and 38 women) of these patients reported having anger attacks according to our criteria. Forty-one (64%) of the 64 depressed patients with anger attacks at baseline did not report anger attacks following fluoxetine treatment, while 7 (7%) of the 100 patients who did not have anger attacks at baseline reported these attacks following treatment, with this difference being statistically significant (chi 2 = 22.7, p < .0005).