Yep having looked into it I note a number of serious side effect. Aside from toxicity for those medically unable to take it, these are predominantly associated with prolonged use. Such as eye damage etc. Prof Raoult advocates a short course of treatment with the drug greatly reducing the the chances of side effects. I guess that's a decision every patient needs to make. Do the risks of COVID19 warrant the risk of taking chloroquine. On balance, if the clinical trial evidence is to be believed, for millions I suggests it would be.