I’m not a medical professional, but perhaps (a question to the medical community – are there any?), it might be worth buying Plaquenil or Immard (Hydroxychloroquine), while it is still available in pharmacies (though it is prescription-based). It is used, among other things, for malaria prevention, and seems quite safe. However, a recent article at the link claims it may be useful for treating the ill. Costs only 300 rubles in Russia.
If there are any medical professionals – I would appreciate comments.
