ampicillin

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ampicillin (ăm´pĬsĬl´Ĭn), a penicillin-type antibiotic that is effective against both gram-negative microorganisms and gram-positive microorganisms such as Escherichia coli. It is often used in the treatment of urinary tract infections, but resistant organisms are increasingly common (see drug resistance). Like other penicillin antibiotics, ampicillin acts against bacteria by inhibiting the synthesis of bacterial cell wall components.

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am·pi·cil·lin / ˌampiˈsilin/ • n. Med. a semisynthetic form of penicillin used chiefly to treat infections of the urinary and respiratory tracts.

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ampicillin (am-pi-sil-in) n. a semisynthetic penicillin administered by mouth or injection in the treatment of a variety of infections, including those of the urinary, respiratory, biliary, and intestinal tracts. Trade names: Penbritin, Rimacillin.