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Penicillin is classified as a bacteriocidal antibiotic, meaning it works by killing bacteria. It does this by inhibiting the synthesis of the bacterial cell wall, which ultimately leads to cell lysis and death of the bacterium. This mechanism makes penicillin particularly effective against certain types of bacteria, especially Gram-positive organisms.

Understanding the classification of antibiotics helps in choosing the right treatment for bacterial infections. Bacteriocidal antibiotics like penicillin are often preferred in situations where rapid bacterial killing is necessary, such as in severe infections where the immune system may not be able to control the bacterial load effectively on its own.

It's important to recognize the distinction from other options: virucidal agents target viruses, fungicides target fungi, and antiseptics serve to reduce pathogens on living tissues without necessarily killing them. Thus, penicillin's specific action against bacteria reinforces its classification as a bacteriocidal antibiotic.