Heparin,
a common, cheap, already FDA approved drug
may treat Covid-19 virus
by blocking the “spike” the virus uses to attach to the human ACE2 receptor on cells.

https://medicalxpress.com/news/2020-07-common-fda-approved-drug-effectively-neutralize.html

Sample quote

SARS-CoV-2, the virus that causes COVID-19, uses a surface spike protein to latch onto human cells and initiate infection. But heparin, a blood thinner also available in non-anticoagulant varieties, binds tightly with the surface spike protein, potentially blocking the infection from happening. This makes it a decoy, which might be introduced into the body using a nasal spray or nebulizer and run interference to lower the odds of infection. Similar decoy strategies have already shown promise in curbing other viruses, including influenza A, Zika, and dengue.

End quote

This is further good news to go along with
Famotidine (PepcidAC)
Raloxifene (Evista)
and the cheap steroid
Dexamethasone