From DailyMail in UK:
Hospital[s?] in Sweden have stopped using the malaria drug chloroquine [?] on coronavirus patients after reports it was causing blinding headaches and vision loss.
Doctors in the Vastra Gotaland region, 200miles west of Stockholm, are no longer administering the medication, touted as a ‘miracle drug’ by Donald Trump. A number of patients at hospitals in the county reported suffering cramps, peripheral vision loss and migraines within days of being prescribed the tablets.
For one in 100 people, chloroquine can also cause the heart to beat too fast or slow, which can lead to a fatal heart attack.
The authors of the article admit they don’t know if the drug in question was chloroquine or hydroxychloroquine. MedicineNet has an article comparing the two drugs. A 1985 journal article says hydroxychloroquine is much safer than chloroquine in terms of retinal (eye) toxicity. A March 31, 2020, article at Annals of Internal Medicine cautions clinicians against use of these drugs for COVID-19, noting that 10 clinical trials are underway, with results available within weeks.
On the other hand, heme-one doctor Ray Page says thinks hydroxychloroquine is pretty darn safe:
Steve Parker, M.D.
PS: On a related note…