The Incorrect Statement is E) Acute Kidney Injury
Acute kidney injury (AKI) is NOT among the most common side effects of antidepressants, making option E the incorrect statement.
Analysis of Each Statement
A) Headache, insomnia, nervousness, akathisia, tinnitus - CORRECT
According to the American College of Physicians guidelines, the most commonly reported adverse events with second-generation antidepressants include headache and insomnia 1. These neurological side effects are well-documented, with headache occurring at rates up to 17 per 1000 person-months of therapy 2. A 2023 meta-analysis confirmed that most second-generation antidepressants increase the risk of neurological side effects compared to placebo 3.
B) Bleeding tendency - CORRECT
While not explicitly detailed in the provided guidelines, bleeding tendency is a recognized side effect of SSRIs due to their effect on platelet serotonin, making this a valid common side effect.
C) Serotonin syndrome, especially in the elderly - CORRECT
Serotonin syndrome is explicitly mentioned as a severe adverse event that "should be kept in mind when patients are being treated with a second-generation antidepressant" 1. The 1998 clinical practice guideline emphasizes that "most worrisome with the selective serotonin reuptake inhibitor drugs (SSRIs) is the serotonin syndrome" and notes it "can be insidious and lethal" 4. Recent case reports confirm fatal outcomes from serotonin syndrome, particularly with drug combinations 5, 6.
D) SIADH - CORRECT
The syndrome of inappropriate antidiuretic hormone (SIADH) is well-established as an antidepressant side effect. The 1998 guideline states that "SIADH has been reported with most antidepressant drugs but appears to be more common with serotonergic agents and in elderly patients" 4. Multiple studies confirm hyponatremia occurs with SSRIs at odds ratios of 1.5-21.6, with incidence rates ranging from 0.06% to 40% 7. Recent 2026 data shows incidence rates of 6.9-10.2% across different antidepressants 8.
E) Acute Kidney Injury - INCORRECT
A comprehensive 2022 systematic review specifically examining psychotropic drugs and kidney effects found that "antidepressants were not associated with acute or chronic kidney harms" and concluded they "appear safe" regarding kidney function 9. The guideline evidence focuses on common adverse events including "constipation, diarrhea, dizziness, headache, insomnia, nausea, sexual adverse events, and somnolence" 1 but makes no mention of acute kidney injury. In contrast, lithium (a mood stabilizer, not an antidepressant) was "almost unanimously associated with chronic kidney disease" 9, but this does not apply to antidepressants.
Clinical Pitfall
The key distinction here is that while lithium causes significant renal toxicity, antidepressants as a class do not cause acute kidney injury as a common side effect. Clinicians should not confuse the renal risks of mood stabilizers (particularly lithium) with those of antidepressants.