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Penicillin (PCN or pen) is a group of antibiotics which include penicillin G (intravenous use), penicillin V (oral use), procaine penicillin, and benzathine penicillin (intramuscular use). They are derived from Penicillium fungi.
All antibiotics are grouped into classes by the pharmacological properties. Different antibiotics have different chemical compound and provide different action. Antibiotics classes: 1  Penicillin-a class including Amoxicillin, Ampicillin, Augmentin. 2  Penicillin provide bactericidal action. 3  Cephalosporin a class similar to Penicillin, used in treatment of bacteria resistant to Penicillin.