Through lots of trial and error plus a healthy dose of experimentation. Scientists have known about the effects of mold on bacteria for hundreds of years but couldn't find a way to definitively prove...
Penicillin mainly targets the cell wall synthesis of a bacterium. As bacteria of genus Mycoplasma have no Cell Wall so Penicillin has no effect on them.
Penicillin has some ghastly side effects as do most medicines here are a FEW of them... . Diarrhea . Sleepiness . Tummy upsets . Swelling . ETC... RESEARCH IT YOUR SELF!!! XXX