Early-Onset Hydroxychloroquine Retinopathy And A Possible Relationship To Blood Levels: Comment On The Article By Petri Et Al

Petri et al reported that higher hydroxychloroquine (HCQ)　blood levels predicted later retinopathy (1) . However, in a recent case-control study, the blood level was not associated with retinopathy(2). The inconsistency may arise from dose adjustment over the years and the timing of blood level testing.