Methicillin

Encyclopedia : M : ME : MET : Methicillin

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Methicillin
6-(2,6-dimethoxybenzamido)-3,3-dimethyl- 7-oxo-4-thia-1-azabicyclo[3.2.0]heptane- 2-carboxylic acid
CAS number [61-32-5]	ATC code [J01CF03]
PubChem [CID 6087]	DrugBank n/a
Chemical formula	C17H20N2O6S
Molecular weight	380.42
Bioavailability	? (not orally-absorbed)
Metabolism	hepatic, 20–40%
Elimination half-life	25–60 minutes
Excretion	renal
Pregnancy category	?
Legal status	?
Routes of administration	IV

Methicillin (USAN, BAN) or meticillin (INN) is a narrow spectrum beta-lactam antibiotic. It is previously used to treat infections caused by susceptible Gram-positive bacteria, particularly beta-lactamase-producing organisms such as Staphylococcus aureus that would otherwise be resistant to most penicillins, but is no longer clinically used. Its role in therapy has been largely replaced by flucloxacillin and dicloxacillin, however the term methicillin-resistant Staphylococcus aureus (MRSA) continues to be used to describe Staphylococcus aureus strains resistant to all penicillins.

Mode of action

Main article: Beta-lactam antibiotic

Like other β-lactam antibiotics, methicillin acts by inhibiting the synthesis of bacterial cell walls. It inhibits cross-linkage between the linear peptidoglycan polymer chains that make up a major component of the cell wall of Gram-positive bacteria.

Medicinal chemistry

Methicillin is insensitive to beta-lactamase (also known as penicillinase) enzymes secreted by many penicillin-resistant bacteria. The presence of the ortho-dimethoxyphenyl group directly attached to the side chain carbonyl group of the penicillin nucleus facilitates the β-lactamase resistance, since those enzymes are relatively intolerant of side-chain steric hindrance. Thus it is able to bind to penicillin binding proteins (PBPs) and inhibit peptidoglycan crosslinking, but is not bound by or inactivated by β-lactamases.

Clinical use

Methicillin is not commonly used in clinical practice, but serves a purpose in the laboratory to determine antibiotic sensitivity in microbiological culture. Methicillin was previously used to treat infections caused by susceptible Gram-positive bacteria. It is unstable in the presence of gastric acid, with a degradation half-life of 5 minutes at pH 2, so it must be administered by injection. (Mitscher, 2002)

See also

• Beta-lactam antibiotic
• Flucloxacillin
• Methicillin-resistant Staphylococcus aureus

References

• Mitscher LA. Antibiotics and antimicrobial agents. In: Williams DA, Lemke TL, editors. Foye's Principles of medicinal chemistry, 5th edition. Philadelphia: Lippincott Williams & Wilkins; 2002.

 

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