What are the effects of antibiotics on our lives? what was the cause for this invention?

Some side effects are
vomiting.
nausea (feeling like you may vomit)
diarrhoea.
bloating and indigestion.
abdominal pain.
loss of appetite

invention?

In 1928, Alexander Fleming, a bacteriologist at London's St. Mary's Hospital, found that a mould on a discarded culture plate had an antibacterial action. The bacteria were staphylococci, a source of serious and often deadly human infection and the mould was 'penicillin'.

It causes drowsiness weakness sometimes stomach ache
 i think that the cause for the invention was that the antibiotics can kill the infection or a disease in our body quickly