- has taken for at least 12 weeks at least the dose shown of a selective serotonin reuptake inhibitor (SSRI) [citalopram, escitalopram, or fluoxetine 20 mg/d; paroxetine 40 mg/d; sertraline 50 mg/d]; or venlafaxine 225 mg/d; or duloxetine 60 mg/d.