HCQ is primarily used to manage autoimmune diseases such as rheumatoid arthritis and lupus. It may also be used to treat malaria by killing the parasite that causes malaria.
"HCQ has been shown to have consistent clinical efficacy for COVID-19 when it is provided early in the outpatient setting; in general, it appears to work better the earlier it is provided. Overall, HCQ is effective against COVID-19. There is no credible evidence that HCQ results in worsening of COVID-19."
NIH article:
The usual dose for adults is 200 - 400 mg/day, taken with or just after a meal.
Check with your health care provider to see if this medicine is appropriate for you, as there are possible drug interactions, side effects, and may not be suitable for those with certain health conditions. Do not take at the same time of day as an antacid.