Psychiatric side effects
Psychiatric side effects including agitation (6%) and anxiety (3%) have been reported. Irritability, lethargy, nervousness, nightmare, restlessness, and sleep disorders have been reported frequently. Completed suicide, mania, manic switching, mood swings, pressure of speech, sluggishness, and suicide attempt have been reported infrequently.
A meta-analysis consisting of 12 randomized placebo-controlled trials (n=2996) found no evidence of a treatment-related increase in risk of suicidal behaviors or ideation with duloxetine compared with placebo in patients with major depressive disorder.
This if from:
http://www.drugs.com/sfx/cymbalta-side-effects.html#system_31193
