- The patient was on stable dosages of medications (allowed by the protocol) for a minimum of 3 months (selective serotonin reuptake inhibitor [SSRIs] and serotonin and norepinephrine reuptake inhibitor [SNRIs]), 8 weeks (contraceptives), or 4 weeks (all other allowed medication) before the screening visit and is not likely to require a change in therapy for at least 12 weeks on the basis of the investigators' assessment.