Metampicillin ( INN) is a

penicillin Penicillins (P, PCN or PEN) are a group of beta-lactam antibiotic, β-lactam antibiotics originally obtained from ''Penicillium'' Mold (fungus), moulds, principally ''Penicillium chrysogenum, P. chrysogenum'' and ''Penicillium rubens, P. ru ...

antibiotic An antibiotic is a type of antimicrobial substance active against bacteria. It is the most important type of antibacterial agent for fighting pathogenic bacteria, bacterial infections, and antibiotic medications are widely used in the therapy ...

. It is prepared by the reaction of ampicillin with formaldehyde, and is hydrolysed in aqueous solution with the formation of ampicillin. Hydrolysis is rapid under acid conditions, e.g., in the stomach, less rapid in neutral media, and incomplete in solutions such as human serum.

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ChEBI ID
Penicillins {{antibiotic-stub