Systematic (IUPAC) name
(2S,5R,6S)-6-[(Carboxy-3-thienylacetyl)amino]- 6-methoxy-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0] heptane-2-carboxylic acid,
Clinical data
CAS Registry Number  Y
ATC code J01
PubChem CID:
ChemSpider  Y
Chemical data
Formula C16H18N2O7S2
Molecular mass 414.453 g/mol

Temocillin is a β-lactamase-resistant penicillin[1][2] introduced by Beecham, marketed by Eumedica Pharmaceuticals as Negaban. It is used primarily for the treatment of multiple drug-resistant, Gram-negative bacteria. It is a carboxypenicillin.[3]


  • Pharmacology 1
  • Dosage 2
  • Adverse effects 3
  • Synthesis 4
  • References 5
  • Further reading 6


Temocillin is a β-lactamase-resistant penicillin. It is not active against Gram-positive bacteria or bacteria with altered penicillin-binding proteins.

It is normally active against Serratia species. Temocillin has no useful activity against Acinetobacter species or Pseudomonas aeruginosa.

Its primary use is against Enterobacteriaceae, and in particular against strains producing extended-spectrum β-lactamase or AmpC β-lactamase.[4]


The common dose is 2 g intravenously every 12 hours. Theoretical reasons exist for giving temocillin as a continuous intravenous infusion in severe disease:[5] a single loading dose of 2 g is given intravenously followed by a 4-g infusion over 24 hours. Temocillin for intravenous injection is diluted in 20 ml of sterile water; it is diluted in less than 2.7 ml of sterile water when being prepared for intramuscular injection; the continuous infusion is diluted in 48 ml of sterile water for ease of administration (1 ml per half hour). To reduce pain, the intramuscular injection may be made up using sterile 1% lignocaine instead of sterile water.

Temocillin may be given to patients with impaired renal function. No adjustment needs to be made to the dose in mild to moderate renal impairment (creatinine clearance greater than 30 ml/min). Temocillin is cleared by haemodialysis, so in dialysis patients, the dose should be given after dialysis.

No oral preparation of temocillin is licensed.

Adverse effects

The undesirable effects of temocillin are those of any β-lactam antibiotic. In particular, it has been associated with angioedema and anaphylaxis in penicillin-allergic patients. Animal studies have not shown any induction of Clostridium difficile infection.[6] As with any other penicillin, convulsions can occur if very high doses are given.


Temocillin synthesis:[7]


  1. ^ Andrews JM, Jevons G, Walker R, Ashby J, Fraise AP (July 2007). "Temocillin susceptibility by BSAC methodology".  
  2. ^ Van Landuyt HW, Pyckavet M, Lambert A, Boelaert J (October 1982). "In vitro activity of temocillin (BRL 17421), a novel beta-lactam antibiotic". Antimicrob. Agents Chemother. 22 (4): 535–40.  
  3. ^ Chanal M, Sirot J, Cluzel M, Joly B, Glanddier Y (June 1983). "[In vitro study of the bacteriostatic and bactericidal activity of temocillin (BRL 17421)]". Pathol. Biol. (in French) 31 (6): 467–70.  
  4. ^ Livermore DM et al. (2006) Activity of temocillin vs. prevalent ESBL- and AmpC-producing Enterobacteriaceae from SE England. J Antimicrob Chemother. 2006 May;57(5):1012-4.
  5. ^ De Jongh R et al. (2008) Continuous versus intermittent infusion of temocillin, a directed spectrum penicillin for intensive care patients with nosocomial pneumonia: stability, compatibility, population pharmacokinetic studies and breakpoint selection. J Antimicrob Chemother. 2008 Feb;61(2):382-8.
  6. ^ Boon RJ, et al. (1985). "Studies with temocillin in a hamster model of antibiotic-associated colitis". Antimicrob Agents Chemother 27 (6): 980–1.  
  7. ^ Bentley, P. H.; Clayton, J. P.; Boles, M. O.; Girven, R. J. (1979). "Transformations using benzyl 6-isocyanopenicillanate". Journal of the Chemical Society, Perkin Transactions 1: 2455.  

Further reading

  • Livermore DM, Tulkens PM (February 2009). "Temocillin revived".