Introduction
Agitation is a frequent and disrupting symptom of schizophrenia spectrum disorders (SSDs) that can be difficult to manage with antipsychotic treatment alone. East Asian herbal medicine has been explored as a complementary therapy, but its effectiveness remains unclear. This review aimed to evaluate the effectiveness and safety of East Asian herbal medicine as an add-on therapy to antipsychotics compared to antipsychotics alone in the management of agitation in patients with SSDs.
Methods
Ten sources including eight databases (PubMed, EMBASE, CENTRAL, CNKI, CiNii, KISS, ScienceON, OASIS) and two additional sources (WHO ICTRP, JSOM website) were searched to January 2025. Randomized controlled trials (RCTs) comparing East Asian herbal medicine added to antipsychotics with antipsychotics alone in patients with SSDs accompanied by agitation were included. The primary outcome was the agitation symptoms measured using standardized scales (CMAI, PANSS-EC, or BPRS-EC), where lower scores indicate reduced agitation. Random-effects meta-analyses were performed. Risk of bias was evaluated using Cochrane RoB 2. The certainty of evidence for each outcome was assessed using the GRADE approach.
Results
Seven RCTs (n = 639) were included. Meta-analysis showed that East Asian herbal medicine added to antipsychotics significantly improved agitation symptoms (SMD −0.88 [95 % CI −1.26, −0.49]; I²=74 %), reduced adverse events (RR 0.44 [95 % CI 0.34, 0.57]; I²=0 %), and improved overall schizophrenia symptoms (SMD −1.99 [95 % CI −3.11, −0.86]; I²=68 %). Risk of bias was assessed as “some concerns” in all studies, mainly because of absence of allocation concealment reporting, placebo controls, and pre-registered protocols. Certainty of evidence was rated as moderate for agitation (downgraded for risk of bias) and low for secondary outcomes (downgraded for risk of bias and imprecision).
Conclusions
East Asian herbal medicine may improve agitation and reduce adverse events in SSDs when combined with antipsychotics. Large effect sizes warrant caution regarding potential small-study effects and methodological limitations. Future research should use rigorous double-blind placebo-controlled designs, standardized formulations, extended follow-ups, and diverse populations.
Registration
Protocol of this review was registered via PROSPERO (CRD42025643106)
Funding
Ministry of Health & Welfare, Republic of Korea [grant number RS-2024-00442840]
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