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Clinical data
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ATC code
Pharmacokinetic data
ExcretionRenal (76%)
  • 2,2-Dimethylpropanoyloxymethyl (2S,5R,6R)-6-{[(2R)-2-amino-2-phenyl-acetyl]amino}-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylate
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.046.975 Edit this at Wikidata
Chemical and physical data
Molar mass463.55 g·mol−1
3D model (JSmol)
  • O=C(OCOC(=O)C(C)(C)C)[C@@H]2N3C(=O)[C@@H](NC(=O)[C@@H](c1ccccc1)N)[C@H]3SC2(C)C
  • InChI=1S/C22H29N3O6S/c1-21(2,3)20(29)31-11-30-19(28)15-22(4,5)32-18-14(17(27)25(15)18)24-16(26)13(23)12-9-7-6-8-10-12/h6-10,13-15,18H,11,23H2,1-5H3,(H,24,26)/t13-,14-,15+,18-/m1/s1 checkY
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Pivampicillin is a pivaloyloxymethyl ester of ampicillin. It is a prodrug, which is thought to enhance the oral bioavailability of ampicillin because of its greater lipophilicity compared to that of ampicillin.

Adverse effects

Prodrugs that release pivalic acid when broken down by the body—such as pivampicillin, pivmecillinam, and cefditoren pivoxil—have long been known to deplete levels of carnitine.[1][2] This effect is not due to the drug itself but to pivalate, which is mostly removed from the body by forming a conjugate with carnitine. Although short-term use of these drugs can cause a marked decrease in blood levels of carnitine,[3] it is unlikely to be of clinical significance;[2] long-term use, however, is not recommended.[2][4][5]


Worldwide, pivampicillin is only available in Denmark, where it is sold as Pondocillin® by PharmaCoDane, or Miraxid® by LEO Pharma.[6]


  1. ^ Holme E, Greter J, Jacobson CE, et al. (August 1989). "Carnitine deficiency induced by pivampicillin and pivmecillinam therapy". Lancet. 2 (8661): 469–73. doi:10.1016/S0140-6736(89)92086-2. PMID 2570185.
  2. ^ a b c Brass EP (December 2002). "Pivalate-generating prodrugs and carnitine homeostasis in man". Pharmacol Rev. 54 (4): 589–98. doi:10.1124/pr.54.4.589. PMID 12429869.
  3. ^ Abrahamsson K, Holme E, Jodal U, Lindstedt S, Nordin I (June 1995). "Effect of short-term treatment with pivalic acid containing antibiotics on serum carnitine concentration—a risk irrespective of age". Biochem. Mol. Med. 55 (1): 77–9. doi:10.1006/bmme.1995.1036. PMID 7551831.
  4. ^ Holme E, Jodal U, Linstedt S, Nordin I (September 1992). "Effects of pivalic acid-containing prodrugs on carnitine homeostasis and on response to fasting in children". Scand J Clin Lab Invest. 52 (5): 361–72. doi:10.3109/00365519209088371. PMID 1514015.
  5. ^ Makino Y, Sugiura T, Ito T, Sugiyama N, Koyama N (September 2007). "Carnitine-associated encephalopathy caused by long-term treatment with an antibiotic containing pivalic acid". Pediatrics. 120 (3): e739–41. doi:10.1542/peds.2007-0339. PMID 17724113.
  6. ^ "Pondocillin®". Retrieved 2016-09-18.