A study of 223 patients diagnosed as suffering from mixed anxiety/depressive states was carried out in general practice to compare the effectiveness of treatment with a once-daily tablet preparation containing 1.5 mg fluphenazine plus 30 mg nortriptyline, taken either at night or in the morning, with the same total daily dose taken as 1 tablet t.d.s. Patients were randomly assigned to 4-week's treatment with one of the three drug schemes, and patients' self-ratings as well as physicians's ratings were used to assess symptoms. Both rating assessments showed that there were highly significant improvements in each of the three treatment groups over the 4-week period. Although there were no clinically important differences between improvements in the night-time dose and t.d.s. groups, there was a higher incidence of drowsiness and tablet defaulting among patients taking the single morning dose.