Antibiotics do not help on COVID-19 infection. COVID-19 is a virus disease, and antibiotics, such as penicillin or ampicillin, do not work on viruses as they are not prokaryotes nor eukaryotes.

There are antiviral medicines, such as interferon, and specific for COVID-19 are under development. Unlike most antibiotics, antiviral drugs do not destroy their target pathogen; instead they inhibit its development.

More Info: en.wikipedia.org