You are asking how antibiotic could possibly kill virus and save your life - the answer is it can't, but there is one thing that can do to save your life

Kills - should instead use term "cleans body" cleans body of overtime bacterial deposits which accumulate overtime specially if you haven't use one in a while...I suppose Coronavirus is designed to foremost attack neurosystem somehow what as a result weakens body condition as whole and its when immune system can fail totally due to above mentioned other issues which have accumulated in body over time gaining in specific moment enough strenght to crush one down totally(fever etc.).

So how could antibiotic play decisive role in this case you say...well by decreasing bellow explained issues, one could allow for body to just ignore(get used to one) virus for long enough for immune system to deal with one efficiency on its own is how...

This is just my own theory(NOT PROFESSIONAL OPINION AS I AM NOT HEALTH CARE PROFESSIONAL) developed based on what I know could possibly solve issue. I wish you all my best...related to https://ausertimes.blogspot.com/2020/04/according-to-slovenian-borut-pahor10.html

Antibiotics, also known as antibacterials, are medications that destroy or slow down the growth of bacteria. They include a range of powerful drugs and are used to treat diseases caused by bacteria. Antibiotics cannot treat viral infections, such as cold, flu, and most coughs.