A review of a recently published guidelines' "strong recommendation" for therapeutic drug monitoring of olanzapine, haloperidol, perphenazine, and fluphenazine.

Ment Health Clin · 2019 · PMC6607953 · PMID 31293849

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did not reach statistical significanceno p-value reported

PER levels greater than 1.2 ng/mL were associated with increased risk of EPS ( P < .02) and a slightly weaker treatment response that did not reach statistical significance.

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