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Print Print. Penicillin is a group of antibiotics that are commonly used to treat different types of gram positive and gram negative bacterial infections. In their structure, beta lactam ring is located due to this reason these drugs are also called as beta lactam antibiotics.
penicillin O-a penicillin that is similar in antibiotic action to penicillin G but is obtained differently. penicillin V, phenoxymethyl penicillin-a crystalline penicillin similar in action to penicillin G but more resistant to the action of gastric acids. piperacillin, Pipracil-a synthetic type of penicillin antibiotic (trade name Pipracil) used for moderate to severe infections.