Ampicillin

Ampicillin is a broad-spectrum penicillin antibiotic that inhibits bacterial cell-wall synthesis. It treats susceptible infections caused by Gram-positive and some Gram-negative bacteria.

Penicillin-binding proteins: Enzymes that build and remodel bacterial cell walls and are targeted by beta-lactam antibiotics. Ampicillin binds these enzymes, blocking the cross-linking needed to strengthen peptidoglycan.
Amoxicillin: An orally useful aminopenicillin antibiotic closely related to ampicillin. Amoxicillin is generally absorbed more reliably by mouth, while both share a similar antibacterial spectrum.
Listeriosis: An infection caused by the bacterium Listeria monocytogenes, which can be severe in pregnancy and immunocompromised people. Ampicillin is a standard treatment for many serious infections caused by Listeria monocytogenes.
Beta-lactam antibiotics: Antibiotics characterized by a beta-lactam ring that interfere with bacterial cell-wall synthesis. Ampicillin belongs to this broad drug family and shares its central mechanism.
Stewardship of antibiotics: Coordinated efforts to use antibiotics appropriately, preserving effectiveness while improving patient outcomes. Restricting ampicillin to susceptible infections helps reduce unnecessary exposure and selection for resistance.
Peptidoglycan: A mesh-like polymer of sugars and amino acids that gives bacterial cell walls strength. Ampicillin weakens bacteria by preventing the cross-linking of this wall material.
Penicillin G: A natural penicillin used mainly against susceptible Gram-positive bacteria and selected other organisms. Ampicillin covers additional Gram-negative bacteria that are not reliably susceptible to penicillin G.
Enterococcal infection: An infection caused by Enterococcus bacteria, which commonly inhabit the gastrointestinal tract. Ampicillin can treat susceptible Enterococcus faecalis infections, including selected bloodstream and urinary infections.
Gram staining: A laboratory staining method that classifies bacteria by cell-envelope properties as Gram-positive or Gram-negative. Ampicillin’s spectrum differs across these groups because their envelopes and resistance traits differ.
Penicillin allergy: An immune-mediated reaction to penicillin drugs, ranging from mild symptoms to life-threatening anaphylaxis. A documented allergy can rule out ampicillin, though many reported penicillin allergies are not confirmed on evaluation.

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