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Methycillin
Also known as: Meticillin, Methycillin, 61-32-5, Methicillinum, Meticilina, Meticilline
Molecular Formula
C17H20N2O6S
Molecular Weight
380.4  g/mol
InChI Key
RJQXTJLFIWVMTO-TYNCELHUSA-N
FDA UNII
Q91FH1328A

One of the PENICILLINS which is resistant to PENICILLINASE but susceptible to a penicillin-binding protein. It is inactivated by gastric acid so administered by injection.
1 2D Structure

Methycillin

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
(2S,5R,6R)-6-[(2,6-dimethoxybenzoyl)amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
2.1.2 InChI
InChI=1S/C17H20N2O6S/c1-17(2)12(16(22)23)19-14(21)11(15(19)26-17)18-13(20)10-8(24-3)6-5-7-9(10)25-4/h5-7,11-12,15H,1-4H3,(H,18,20)(H,22,23)/t11-,12+,15-/m1/s1
2.1.3 InChI Key
RJQXTJLFIWVMTO-TYNCELHUSA-N
2.1.4 Canonical SMILES
CC1(C(N2C(S1)C(C2=O)NC(=O)C3=C(C=CC=C3OC)OC)C(=O)O)C
2.1.5 Isomeric SMILES
CC1([C@@H](N2[C@H](S1)[C@@H](C2=O)NC(=O)C3=C(C=CC=C3OC)OC)C(=O)O)C
2.2 Other Identifiers
2.2.1 UNII
Q91FH1328A
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Dimethoxyphenyl Penicillin

2. Methicillin Hydrate, Monosodium Salt

3. Methicillin Monohydrate, Monosodium Salt

4. Methicillin Sodium

5. Meticillin

6. Metin

7. Penicillin, Dimethoxyphenyl

8. Staphcillin

2.3.2 Depositor-Supplied Synonyms

1. Meticillin

2. Methycillin

3. 61-32-5

4. Methicillinum

5. Meticilina

6. Meticilline

7. Meticillinum

8. Staphcillin

9. Metacillin

10. Dimocillin

11. Meticilina [inn-spanish]

12. Meticilline [inn-french]

13. Meticillinum [inn-latin]

14. (2,6-dimethoxyphenyl)penicillin

15. 6-(2,6-dimethoxybenzamido)penicillanic Acid

16. Chebi:6827

17. (2s,5r,6r)-6-[(2,6-dimethoxybenzoyl)amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid

18. Brl 1241

19. 6beta-(2,6-dimethoxybenzamido)penicillanic Acid

20. 2,6-dimethoxyphenyl Penicillin

21. Meticillina

22. Q91fh1328a

23. Celbenin

24. Meticillina [dcit]

25. (2s,5r,6r)-6-(2,6-dimethoxybenzamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid

26. Meticillin [inn]

27. Methicillin [usan]

28. Hsdb 3121

29. Meticillin [inn:ban]

30. Einecs 200-505-8

31. Penicillin, (2,6-dimethoxyphenyl)-

32. Methcilline

33. Unii-q91fh1328a

34. (2s,5r,6r)-6-(2,6-dimethoxybenzamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic Acid

35. 4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic Acid, 6-((2,6-dimethoxybenzoyl)amino)-3,3-dimethyl-7-oxo-, (2s-(2alpha,5alpha,6beta))-

36. Spectrum_000993

37. Spectrum2_001965

38. Spectrum3_000494

39. Spectrum4_000878

40. Spectrum5_001600

41. Meticillin [hsdb]

42. Chembl575

43. Epitope Id:139649

44. Methicillin [vandf]

45. Schembl4898

46. Meticillin [who-dd]

47. Bspbio_001987

48. Kbiogr_001575

49. Kbioss_001473

50. 4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic Acid, 6-(2,6-dimethoxybenzamido)-3,3-dimethyl-7-oxo-

51. 6-(2,3-dimethoxybenzamido)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic Acid

52. Divk1c_000100

53. Spbio_002089

54. Dtxsid6023284

55. Kbio1_000100

56. Kbio2_001473

57. Kbio2_004041

58. Kbio2_006609

59. Kbio3_001487

60. Ninds_000100

61. Zinc3831070

62. Bdbm50103523

63. 6beta-(2,6-dimethoxybenzamido)-2,2-dimethylpenam-3alpha-carboxylic Acid

64. Db01603

65. Idi1_000100

66. (2s,5r,6r)-6-{[(2,6-dimethoxyphenyl)carbonyl]amino}-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid

67. 4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic Acid, 6-(2,6-dimethoxybenzamido)-3,3,-dimethyl-7-oxo-

68. Mii

69. Sbi-0051440.p003

70. Hy-121544

71. Mrsa Selective Supplement, For Microbiology

72. Cs-0082724

73. C07177

74. Q409262

75. Brd-k34388247-236-02-5

76. (2s,5r,6r)-6-[(2,6-dimethoxybenzene)amido]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic Acid

2.4 Create Date
2005-06-24
3 Chemical and Physical Properties
Molecular Weight 380.4 g/mol
Molecular Formula C17H20N2O6S
XLogP31.2
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count7
Rotatable Bond Count5
Exact Mass380.10420754 g/mol
Monoisotopic Mass380.10420754 g/mol
Topological Polar Surface Area131 Ų
Heavy Atom Count26
Formal Charge0
Complexity600
Isotope Atom Count0
Defined Atom Stereocenter Count3
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Therapeutic Uses

Penicillins

National Library of Medicine's Medical Subject Headings online file (MeSH, 1999)


Methicillin /is/ indicated in the treatment of bone and joint infections caused by susceptible organisms. /Included in US product labeling; Not included in Canadian product labeling/

USP Convention. USPDI - Drug Information for the Health Care Professional. 15 th ed. Volume 1. Rockville, MD: United States Pharmacopeial Convention, Inc., 1995. (Plus updates.), p. 2149


Methicillin /is/ indicated in the treatment of bacterial endocarditis caused by susceptible organisms. /Included in US product labeling; Not included in Canadian product labeling/

USP Convention. USPDI - Drug Information for the Health Care Professional. 15 th ed. Volume 1. Rockville, MD: United States Pharmacopeial Convention, Inc., 1995. (Plus updates.), p. 2149


Methicillin /is/ indicated in the treatment of bacterial septicemia caused by susceptible organisms. /Included in US product labeling/

USP Convention. USPDI - Drug Information for the Health Care Professional. 15 th ed. Volume 1. Rockville, MD: United States Pharmacopeial Convention, Inc., 1995. (Plus updates.), p. 2150


For more Therapeutic Uses (Complete) data for METHICILLIN (7 total), please visit the HSDB record page.


4.2 Drug Warning

METHICILLIN MUST NOT BE USED IN PREFERENCE TO PENICILLIN G IN INFECTIONS AMENDABLE TO TREATMENT WITH LATTER DRUG.

Gilman, A.G., T.W. Rall, A.S. Nies and P. Taylor (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 8th ed. New York, NY. Pergamon Press, 1990., p. 1075


IMPORTANT BIOLOGICAL EFFECT OF PENICILLIN, UNRELATED TO HYPERSENSITIVITY OR TO "TOXIC" REACTION, IS ALTERATION OF BACTERIAL FLORA IN AREAS OF BODY TO WHICH IT GAINS ACCESS. /PENICILLIN/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 1150


IM INJECTION OF METHICILLIN IS MORE PAINFUL THAN IS CASE FOR OTHER PENICILLINS; NEED FOR FREQUENT INJECTIONS (EVERY 2-3 HR) IS DEFINITE DISADVANTAGE WHEN PROLONGED THERAPY BY THIS ROUTE IS REQUIRED.

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 1143


IN SOME PERSONS...SUPRAINFECTION RESULTS FROM CHANGES IN FLORA. DERMATITIS INVOLVING PRIMARILY SCROTAL & INGUINAL SKIN...HAS BEEN OBSERVED... DRAMATIC EFFECT THAT MAY FOLLOW USE OF PENICILLIN IN SYPHILIS IS JARISCH-HERXHEIMER REACTION... /PENICILLINS/

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 1150


For more Drug Warnings (Complete) data for METHICILLIN (21 total), please visit the HSDB record page.


4.3 Drug Indication

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.


5 Pharmacology and Biochemistry
5.1 Pharmacology

Meticillin (INN, BAN) or methicillin (USAN) is a narrow spectrum beta-lactam antibiotic of the penicillin class. It 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.


5.2 MeSH Pharmacological Classification

Anti-Bacterial Agents

Substances that inhibit the growth or reproduction of BACTERIA. (See all compounds classified as Anti-Bacterial Agents.)


5.3 ATC Code

J - Antiinfectives for systemic use

J01 - Antibacterials for systemic use

J01C - Beta-lactam antibacterials, penicillins

J01CF - Beta-lactamase resistant penicillins

J01CF03 - Meticillin


5.4 Absorption, Distribution and Excretion

Absorption

Not absorbed following oral administration.


METHICILLIN IS NOT EMPLOYED BY ORAL ROUTE BECAUSE IT IS POORLY ABSORBED & READILY DESTROYED BY ACIDIC GASTRIC CONTENTS. WHEN DRUG IS GIVEN IM, PEAK PLASMA CONCN ARE REACHED IN ABOUT 30 MIN-1 HR. AFTER CONVENTIONAL DOSE OF 1 G IN ADULTS, PLASMA CONCN IN EXCESS OF 10 UG/ML ARE DEMONSTRABLE...

Gilman, A.G., T.W. Rall, A.S. Nies and P. Taylor (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 8th ed. New York, NY. Pergamon Press, 1990., p. 1075


...2-G DOSE PROVIDES PEAK CONCN OVER 20 UG/ML, & APPROX 8 UG/ML IS STILL PRESENT AFTER 4 HR. ABOUT 40% OF METHICILLIN IN PLASMA IS BOUND TO PROTEIN. METHICILLIN DOES NOT READILY PENETRATE INTO CSF; HOWEVER, SIGNIFICANT CONCN ARE PRESENT IN PATIENTS WITH MENINGITIS... DRUG...WELL DISTRIBUTED IN VARIOUS BODY FLUIDS & TISSUES.

Gilman, A.G., T.W. Rall, A.S. Nies and P. Taylor (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 8th ed. New York, NY. Pergamon Press, 1990., p. 1075


METHICILLIN IS EXCRETED UNCHANGED IN URINE...ABOUT 2/3 OF IM DOSE IS ELIMINATED BY THIS ROUTE IN 4 HR. ... METHICILLIN PERSISTS FOR LONG PERIOD & @ HIGH CONCN IN PLASMA IN CASES OF RENAL FAILURE. ... PORTION OF INJECTED METHICILLIN THAT CANNOT BE DETECTED IN URINE IS EXCRETED INTO BILE & IS ELIMINATED BY WAY OF FECES.

Goodman, L.S., and A. Gilman. (eds.) The Pharmacological Basis of Therapeutics. 5th ed. New York: Macmillan Publishing Co., Inc., 1975., p. 1143


DRUGS RECENTLY SHOWN TO ACTIVELY CROSS HUMAN PLACENTA INCL...SODIUM METHICILLIN... /METHICILLIN SODIUM/

The Chemical Society. Foreign Compound Metabolism in Mammals. Volume 2: A Review of the Literature Published Between 1970 and 1971. London: The Chemical Society, 1972., p. 433


For more Absorption, Distribution and Excretion (Complete) data for METHICILLIN (21 total), please visit the HSDB record page.


5.5 Metabolism/Metabolites

Hepatic (20-40%).


YIELDS 2,6-DIMETHOXYPHENYLPENICILLOIC ACID IN BACILLUS. /FROM TABLE/

Goodwin, B.L. Handbook of Intermediary Metabolism of Aromatic Compounds. New York: Wiley, 1976., p. D-80


5.6 Biological Half-Life

25-60 minutes


The serum half-life of methicillin in adults with normal renal function is 0.4-0.5 hours.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 95. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1995 (Plus Supplements 1995)., p. 268


Serum concn of methicillin may be higher and the serum half-life prolonged in patients with impaired renal function. The serum half-life of the drug reportedly averages 4-6 hr in anuric patients.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 95. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1995 (Plus Supplements 1995)., p. 268


In one study in children 2-16 yr of age, the serum half-life of methicillin averaged 0.8 hr after IV administration and 1.6 hr after IM administration. Serum concn of methicillin are generally higher and the serum half-life is longer in neonates than in older children. The serum half-life of the drug is generally inversely proportional to birthweight, gestational age, and chronologic age. The serum half-life of methicillin reportedly ranges from 2-3.9 hr in low birthweight neonates 2 wk of age or younger and ranges from 0.9-3.3 hr in low birthweight neonates older than 2 wk of age or neonates weighing 2 kg or more who are 6.5 wk of age or younger.

McEvoy, G.K. (ed.). American Hospital Formulary Service - Drug Information 95. Bethesda, MD: American Society of Hospital Pharmacists, Inc., 1995 (Plus Supplements 1995)., p. 268


5.7 Mechanism of Action

Similar to other beta-lactam antimicrobials, meticillin blocks synthesis of the bacterial cell wall. Meticillin stops cross-linkage between the peptidoglycan polymer chains, which make up a large portion of gram-positive bacterial cell walls. It does this by binding to and competitively inhibiting the transpeptidase enzyme used by bacteria to cross-link the peptide (D-alanyl-alanine) used in peptidogylcan synthesis.


The penicillins and their metabolites are potent immunogens because of their ability to combine with proteins and act as haptens for acute antibody-mediated reactions. The most frequent (about 95 percent) or "major" determinant of penicillin allergy is the penicilloyl determinant produced by opening the beta-lactam ring of the penicillin. This allows linkage of the penicillin to protein at the amide group. "Minor" determinants (less frequent) are the other metabolites formed, including native penicillin and penicilloic acids. /Penicillins/

Haddad, L.M., Clinical Management of Poisoning and Drug Overdose. 2nd ed. Philadelphia, PA: W.B. Saunders Co., 1990., p. 953


Bactericidal; inhibit bacterial cell wall synthesis. Action is dependent on the ability of penicillins to reach and bind penicillin-binding proteins (PBPs) located on the inner membrane of the bacterial cell wall. Penicillin-binding proteins (which include transpeptidases, carboxypeptidases, and endopeptidases) are enzymes that are involved in the terminal stages of assembling the bacterial cell wall and in reshaping the cell wall during growth and division. Penicillins bind to, and inactivate, penicillin-binding proteins, resulting in the weakening of the bacterial cell wall and lysis. /Penicillins/

USP Convention. USPDI - Drug Information for the Health Care Professional. 15 th ed. Volume 1. Rockville, MD: United States Pharmacopeial Convention, Inc., 1995. (Plus updates.), p. 2150


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