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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.
The aminopenicillins were the first class of penicillins, which were discovered as active agents against several gram (-) bacteria (e.g. H. influenzae and E. coli). This class of penicillins have acid resistant properties, and for this reason they are available in oral dosage forms. Orally administered drugs (amoxicillin, Bacampicillin and ampicillin) of this class are usually used in several mild infections, including sinusitis, tonsillitis, otitis media, bronchitis, bacterial diarrhea and UTIs.