Question

why does antibiotic penicillin does not affect human at all

Answer 1

$\huge{\underline{\bold{\red{\ ANSWER}}}}$

Antibiotics work by affecting things that bacterial cells have but human cells don't. For example, human cells do not have cell walls, while many types of bacteria do. The antibiotic penicillin works by keeping a bacterium from building a cell wall. ... Some antibiotics dissolve the membrane of just bacterial cells.

Answer 2

⇒ Antibiotics are commonly use to block biochemical pathways which is important for bacteria.

⇒ Many Bacteria make cell wall to protect themselves.

⇒ The antibiotic penicillin blocks the bacterial processes that build the cell wall.

⇒ As a result, The growing bacteria are unable to make cell wall and die easily.

⇒ But viruses do not use this path ways therefore antibiotic do not work against viral infection.