What question did this study set out to answer?

To define optimal blood levels of hydroxychloroquine to enhance safety and effectiveness in lupus treatment.

December 9, 2025Arthritis & RheumatologyOpen Access

Defining Optimally Safe and Effective Blood Levels of Hydroxychloroquine in Lupus: An Important Step toward Precision Drug Monitoring

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To define optimal blood levels of hydroxychloroquine to enhance safety and effectiveness in lupus treatment.
Conducted an observational study with 2010 patients across multiple clinics.
Used logistic regression and spline analyses on blood level measurements to identify toxicity thresholds.
Examined the relationship between chronic kidney disease stages and hydroxychloroquine blood levels.
4.9% of patients exhibited hydroxychloroquine-related toxicity.
Odds of toxicity were significantly higher with blood levels ≥1150 ng/mL.
Patients with chronic kidney disease stage ≥3 had increased odds of supratherapeutic levels.

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Observational study reveals safety thresholds for hydroxychloroquine in lupus, indicating monitoring can optimize treatment outcomes.

Garg et al. (2025) studied this question.

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