Prophylaxis (i.e. to prevent infection) in those who previously had rheumatic heart disease or are undergoing dental procedures, vaginal hysterectomies, or C-sections.[7] It is also used in pregnant woman who are carriers of group B streptococci to prevent early-onset neonatal infections.[7]
Ampicillin can be administered by mouth, an intramuscular injection (shot) or by intravenous infusion.[7] The oral form, available as capsules or oral suspensions, is not given as an initial treatment for severe infections, but rather as a follow-up to an IM or IV injection.[7] For IV and IM injections, ampicillin is kept as a powder that must be reconstituted.[23]
IV injections must be given slowly, as rapid IV injections can lead to convulsive seizures.[7][24]
Specific populations
Ampicillin is one of the most used drugs in pregnancy,[25] and has been found to be generally harmless both by the Food and Drug Administration in the U.S. (which classified it as category B) and the Therapeutic Goods Administration in Australia (which classified it as category A).[7][26] It is the drug of choice for treating Listeria monocytogenes in pregnant women, either alone or combined with an aminoglycoside.[7] Pregnancy increases the clearance of ampicillin by up to 50%, and a higher dose is thus needed to reach therapeutic levels.[25][27]
Ampicillin crosses the placenta and remains in the amniotic fluid at 50–100% of the concentration in maternal plasma; this can lead to high concentrations of ampicillin in the newborn.[27]
While lactating mothers secrete some ampicillin into their breast milk, the amount is minimal.[7][25]
In newborns, ampicillin has a longer half-life and lower plasma protein binding.[28] The clearance by the kidneys is lower, as kidney function has not fully developed.[7]
Ampicillin is not recommended in people with concurrent mononucleosis, as over 40% of patients develop a skin rash.[13]
Side effects
Ampicillin is comparatively less toxic than other antibiotics, and side effects are more likely in those who are sensitive to penicillins and those with a history of asthma or allergies.[13] In very rare cases, it causes severe side effects such as angioedema, anaphylaxis, and C. difficile infection (that can range from mild diarrhea to serious pseudomembranous colitis).[13] Some develop black "furry" tongue. Serious adverse effects also include seizures and serum sickness. The most common side effects, experienced by about 10% of users are diarrhea and rash. Less common side effects can be nausea, vomiting, itching, and blood dyscrasias. The gastrointestinal effects, such as hairy tongue, nausea, vomiting, diarrhea, and colitis, are more common with the oral form of penicillin.[13] Other conditions may develop up several weeks after treatment.[7]
Ampicillin reacts with probenecid and methotrexate to decrease renal excretion. Large doses of ampicillin can increase the risk of bleeding with concurrent use of warfarin and other oral anticoagulants, possibly by inhibiting platelet aggregation.[29] Ampicillin has been said to make oral contraceptives less effective,[7] but this has been disputed.[30] It can be made less effective by other antibiotic, such as chloramphenicol, erythromycin, cephalosporins, and tetracyclines.[23] For example, tetracyclines inhibit protein synthesis in bacteria, reducing the target against which ampicillin acts.[31] If given at the same time as aminoglycosides, it can bind to it and inactivate it. When administered separately, aminoglycosides and ampicillin can potentiate each other instead.[7][32]
Ampicillin causes skin rashes more often when given with allopurinol.[13]
Both the live cholera vaccine and live typhoid vaccine can be made ineffective if given with ampicillin. Ampicillin is normally used to treat cholera and typhoid fever, lowering the immunological response that the body has to mount.[33][34][35]
Pharmacology
Mechanism of action
Ampicillin is in the penicillin group of beta-lactam antibiotics and is part of the aminopenicillin family. It is roughly equivalent to amoxicillin in terms of activity.[7] Ampicillin is able to penetrate gram-positive and some gram-negative bacteria. It differs from penicillin G, or benzylpenicillin, only by the presence of an amino group. This amino group, present on both ampicillin and amoxicillin, helps these antibiotics pass through the pores of the outer membrane of gram-negative bacteria, such as Escherichia coli, Proteus mirabilis, Salmonella enterica, and Shigella.[19][36]
Ampicillin acts as an irreversible inhibitor of the enzyme transpeptidase, which is needed by bacteria to make the cell wall.[7] It inhibits the third and final stage of bacterial cell wall synthesis in binary fission, which ultimately leads to cell lysis; therefore, ampicillin is usually bacteriolytic.[7][37]
Pharmacokinetics
Ampicillin is well-absorbed from the GI tract (though food reduces its absorption), and reaches peak concentrations in one to two hours. The bioavailability is around 62% for parenteral routes. Unlike other penicillins, which usually bind 60–90% to plasma proteins, ampicillin binds to only 15–20%.[7][28]
Ampicillin is distributed through most tissues, though it is concentrated in the liver and kidneys. It can also be found in the cerebrospinal fluid when the meninges become inflamed (such as, for example, meningitis).[28] Some ampicillin is metabolized by hydrolyzing the beta-lactam ring to penicilloic acid,[7] though most of it is excreted unchanged.[13] In the kidneys, it is filtered out mostly by tubular secretion; some also undergoes glomerular filtration, and the rest is excreted in the feces and bile.
Ampicillin has been used extensively to treat bacterial infections since 1961.[39] Until the introduction of ampicillin by the British company Beecham, penicillin therapies had only been effective against gram-positive organisms such as staphylococci and streptococci.[37] Ampicillin (originally branded as "Penbritin") also demonstrated activity against gram-negative organisms such as H. influenzae, coliforms, and Proteus spp.[39]
Society and culture
Economics
Ampicillin is relatively inexpensive.[40] In the United States, it is available as a generic medication.[7]
Veterinary use
In veterinary medicine, ampicillin is used in cats, dogs, and farm animals to treat:[16]
E. coli and Salmonella infections in cattle, sheep, and goats (oral form). Ampicillin use for this purpose had declined as bacterial resistance has increased.[38]
Horses are generally not treated with oral ampicillin, as they have low bioavailability of beta-lactams.[17]
The half-life in animals is around that same of that in humans (just over an hour). Oral absorption is less than 50% in cats and dogs, and less than 4% in horses.[18]
^World Health Organization (2023). The selection and use of essential medicines 2023: web annex A: World Health Organization model list of essential medicines: 23rd list (2023). Geneva: World Health Organization. hdl:10665/371090. WHO/MHP/HPS/EML/2023.02.
^Suleyman G, Zervos MJ (2016). "Safety and efficacy of commonly used antimicrobial agents in the treatment of enterococcal infections: a review". Expert Opinion on Drug Safety. 15 (2): 153–167. doi:10.1517/14740338.2016.1127349. PMID26629598. S2CID25488987.
^Australian Government Department of Health Therapeutic Goods Administration (25 October 2017). "Prescribing medicines in pregnancy database". Therapeutic Goods Administration (TGA). Australian Government Department of Health. Archived from the original on 20 December 2016. Retrieved 23 February 2018. Note: scroll down to "Search by name" and type "ampicillin" into the search bar. Requires JavaScript to be enabled.
^ abPetri WA (2011). "Penicillins, Cephalosporins, and Other Beta-Lactam Antibiotics". In Brunton L, Chabner B, Knollman B (eds.). Goodman and Gilman's the Pharmacological Basis of Therapeutics (Twelfth ed.). New York: McGraw Hill Professional. pp. 1477–1504. ISBN978-0-07-176939-6.
^Erskine R. "Mastitis in Sows". Merck Veterinary Manual. Archived from the original on 4 July 2017. Retrieved 22 August 2017.
External links
GB patent 902703, Frank Peter Doyle, John Herbert Charles Nayler, Harry Smith, "Penicillins", published 1962-08-09, assigned to Beecham Research Laboratories Ltd
US patent 2985648, Frank Peter Doyle, John Herbert Charles Nayler, Harry Smith, "Alpha-aminobenzylpenicillins", published 1961-05-23, issued 1961-05-23
US patent 3157640, David A Johnson & Glenn A Hardcastle Jr, "D-(-)-alpha-aminobenzylpenicillin trihydrate", published 1964-11-17, issued 1964-11-17, assigned to Bristol Myers Co
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