氯喹当然有副作用，“It is known that some people who take hydroxychloroquine for more than five years and/or in high doses are at increased risk of damage to their retina, the light sensitive layer of cells at the back of the eye. This is known as retinal toxicity or retinopathy”。但据我所知250毫克氯喹或者400毫克硫酸羟氯喹是很多治疗红斑狼疮患者每日的维持量，应该是很安全的，处于肺炎病毒高风险环境的人在疫情时间短期服用应该还是可以承受的。
然后知乎大拿杀生丸在《武汉新型冠状病毒应对方略之四十九--氯喹治疗艾滋病的临床实验药物剂量分析》也提到：
“如果你没有症状，想预防，就使用抗疟疾的低剂量， 250毫克氯喹或者400毫克硫酸羟氯喹。 如果有症状或者确认感染新冠病毒，就使用500毫克氯喹或者800毫克硫酸羟氯喹的抗病毒剂量。
还是那句话，别等到出现严重肺损伤再试用氯喹，到了那个阶段，什么药都没有好的效果。”
氯喹当然有副作用，“It is known that some people who take hydroxychloroquine for more than five years and/or in high doses are at increased risk of damage to their retina, the light sensitive layer of cells at the back of the eye. This is known as retinal toxicity or retinopathy”。但据我所知250毫克氯喹或者400毫克硫酸羟氯喹是很多治疗红斑狼疮患者每日的维持量，应该是很安全的，处于肺炎病毒高风险环境的人在疫情时间短期服用应该还是可以承受的。
请懂医的同学出来指正指正，你的只言片语或许会救人一命。