Hydroxychloroquine being overdosed: study

Almost half of women prescribed hydroxychloroquine may be taking too much, a study suggests.

Among 21,000 UK patients who started taking the drug between 2007 and 2016, 47% of women and 7% of men were on a dose exceeding the UK’s Royal College of Ophthalmologists’ 2009 recommended maximum of 6.5mg/kg ideal body weight/day.

Vision-threatening toxic retinopathy was the major long-term adverse event associated with hydroxychloroquine, and while rates historically had been considered low (<2%), a recent US study had shown a

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