The efficacy and safety of hydroxychloroquine at different doses and courses for COVID-19 prevention: a systematic review and network meta-analysis.

Background: The optimal strategy for using hydroxychloroquine to prevent coronavirus disease 2019 (COVID-19) in patients, either before or after exposure, remains unclear. We evaluated the safety and efficacy of different doses and treatment durations of hydroxychloroquine for COVID-19 prevention.

Method: Databases including PubMed, Web of Science, Cochrane Library, EMBASE, Medline, and ClinicalTrials.gov were systematically searched for randomized controlled trials (RCTs) comparing different doses of hydroxychloroquine for COVID-19 prevention, from their inception to February 2024.

Results: A total of 20 RCTs involving 12,372 patients were included. Meta-analysis results showed no significant difference between the hydroxychloroquine and control groups in reducing the incidence of syndrome coronavirus type 2 (SARS-CoV-2) positivity (OR = 0.83, 95% CI = 0.67, 1.03). However, the subgroup receiving a daily dose of 200-400 mg (OR = 0.62, 95% CI = 0.51, 0.75) and a treatment duration of 5-8 weeks (OR = 0.52, 95% CI = 0.31, 0.88) showed statistically significant reductions in SARS-CoV-2 positivity. According to the surface under the cumulative ranking curve (SUCRA), the most effective intervention was a 200-400 mg dose for 5-8 weeks.  .

Conclusions: A hydroxychloroquine dose of 200-400 mg for a duration of 5-8 weeks may moderately reduce the risk of COVID-19 with a relatively low risk of adverse events.