A client with depression has been prescribed a selective serotonin reuptake inhibitor (SSRI). The client asks: 'How long before I feel better?' What is the most accurate response?

SSRI ONSET OF ACTION: SSRIs do not produce immediate mood improvement. TIMELINE: Initial effects (sleep improvement, anxiety reduction, energy): sometimes within 1-2 weeks; Mood improvement: typically 2-4 weeks; Full therapeutic effect: 4-8 weeks at therapeutic dose; IMPORTANT: Some side effects (nausea, headache, insomnia, sexual dysfunction) may appear BEFORE mood improvement — clients must be warned or they often discontinue early assuming it's 'not working'; CLINICAL SIGNIFICANCE: The most dangerous period for suicidal ideation in depression treatment is often when the client has enough energy to act but mood has not yet improved (within the first 1-4 weeks) — requires close monitoring during this period; EDUCATION: Never stop suddenly — taper under provider guidance to avoid discontinuation syndrome.