Only when it isn't taking early. These studies that show Hydroxychloroquine is ineffective are from people who were on their death bed. Here is a YT video debunking the controversy.
https://www.youtube.com/watch?v=dLSYRqcg0wo
"Every patient I have prescribed HCQ was very very ill, and within 8 to 12 hours, they were basically symptom free" - Doctor Anthony Cardillo, Los Angelos. T
Boris Johnson of the U.K. got the Coronavirus and was in critical condition. he took Hydroxychloroquine with z-PAC and zinc and walked out of the hospital in 2 days symptom free and Tested negative for the Coronavirus.
Karen Whitsett (D) tested positive for the Coronavirus. She heard about Hydroxychloroquine from Trump and asked the doctors for Hydroxychloroquine. In less than 2 hours, she was symptom free.
https://www.thesun.co.uk/news/11350000/michigan-democrat-trump-hydroxychloroquine-coronavirus-drug/
The key is to take Hydroxychloroquine with Zinc and z-PAC in the early stages of the Coronavirus. Don't take it if you're about to die, then it won't work.