The large number of long term hydroxychloroquine users in Australia necessitates clear guidelines on hydroxychloroquine retinopathy screening
Hydroxychloroquine retinopathy, which causes permanent visual loss, is a well documented adverse effect in long term users of both hydroxychloroquine and chloroquine. However, it can be difficult to detect as visual acuity is often well preserved until the disease is severe.1 Because of this, it was once thought to be a rare adverse effect, with only 0.5–2.0% of long term hydroxychloroquine users estimated to suffer from the condition.2 However, a 2014 epidemiological study of 2361 patients using hydroxychloroquine long term in the United States found that this was a large underestimation.2 The investigators found an overall prevalence of 7.5% in patients who had taken the drug for at least 5 years, but this risk increased with length of use and dosage.2
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