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2D Structure
Also known as: 42835-25-6, Apurone, Flumigal, 9-fluoro-5-methyl-1-oxo-1,5,6,7-tetrahydropyrido[3,2,1-ij]quinoline-2-carboxylic acid, R-802, Uvg8vsp2sj
Molecular Formula
C14H12FNO3
Molecular Weight
261.25  g/mol
InChI Key
DPSPPJIUMHPXMA-UHFFFAOYSA-N
FDA UNII
UVG8VSP2SJ

Flumequine is a synthetic chemotherapeutic antibiotic of the fluoroquinolone drug class used to treat bacterial infections.
1 2D Structure

2D Structure

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
7-fluoro-12-methyl-4-oxo-1-azatricyclo[7.3.1.05,13]trideca-2,5,7,9(13)-tetraene-3-carboxylic acid
2.1.2 InChI
InChI=1S/C14H12FNO3/c1-7-2-3-8-4-9(15)5-10-12(8)16(7)6-11(13(10)17)14(18)19/h4-7H,2-3H2,1H3,(H,18,19)
2.1.3 InChI Key
DPSPPJIUMHPXMA-UHFFFAOYSA-N
2.1.4 Canonical SMILES
CC1CCC2=C3N1C=C(C(=O)C3=CC(=C2)F)C(=O)O
2.2 Other Identifiers
2.2.1 UNII
UVG8VSP2SJ
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Apurone

2. R 802

3. R-802

2.3.2 Depositor-Supplied Synonyms

1. 42835-25-6

2. Apurone

3. Flumigal

4. 9-fluoro-5-methyl-1-oxo-1,5,6,7-tetrahydropyrido[3,2,1-ij]quinoline-2-carboxylic Acid

5. R-802

6. Uvg8vsp2sj

7. Nsc-757806

8. Mls000069546

9. Chebi:85269

10. 1h,5h-benzo(ij)quinolizine-2-carboxylic Acid, 9-fluoro-6,7-dihydro-5-methyl-1-oxo-

11. 9-fluoro-5-methyl-1-oxo-6,7-dihydro-1h,5h-pyrido[3,2,1-ij]quinoline-2-carboxylic Acid

12. Ncgc00018211-03

13. Flumequinum

14. Flumequino

15. Flumiquil

16. Flumisol

17. Imequyl

18. Smr000058826

19. Flumix

20. R 802 (bactericide)

21. 1h,5h-benzo[ij]quinolizine-2-carboxylic Acid, 9-fluoro-6,7-dihydro-5-methyl-1-oxo-

22. Dsstox_cid_25623

23. Dsstox_rid_81008

24. Dsstox_gsid_45623

25. 7-fluoro-12-methyl-4-oxo-1-azatricyclo[7.3.1.05,13]trideca-2,5,7,9(13)-tetraene-3-carboxylic Acid

26. Flumequinum [inn-latin]

27. Flumequino [inn-spanish]

28. Flm

29. Hsdb 7034

30. R 802

31. Sr-01000000130

32. Unii-uvg8vsp2sj

33. Einecs 255-962-6

34. Fantacin

35. Flumequine [usan:inn:ban]

36. (rs)-9-fluoro-5-methyl-1-oxo-6,7-dihydro-1h,5h-benzo[i,j]quinolizine-2-carboxylic Acid

37. Prestwick_603

38. Apurone (tn)

39. Cas-42835-25-6

40. Mfcd00079298

41. Spectrum_000367

42. Flumequine [mi]

43. Flumequine [inn]

44. Flumequine (usan/inn)

45. Opera_id_1399

46. Prestwick0_000204

47. Prestwick1_000204

48. Prestwick2_000204

49. Prestwick3_000204

50. Spectrum2_001200

51. Spectrum3_001417

52. Spectrum4_000826

53. Spectrum5_001532

54. Flumequine [hsdb]

55. Flumequine [usan]

56. Flumequine [mart.]

57. 9-fluoro-6,7-dihydro-5-methyl-1-oxo-1h,5h-benzo(ij)quinolizine-2-carboxylic Acid

58. Flumequine [who-dd]

59. Schembl49829

60. Bspbio_000187

61. Bspbio_003094

62. Kbiogr_001371

63. Kbioss_000847

64. Mls001074120

65. Divk1c_000089

66. Spectrum1500992

67. Spbio_001279

68. Spbio_002108

69. Bpbio1_000207

70. Chembl370252

71. Dtxsid5045623

72. Chebi:94431

73. Hms500e11

74. Kbio1_000089

75. Kbio2_000847

76. Kbio2_003415

77. Kbio2_005983

78. Kbio3_002314

79. Flumequine [ep Monograph]

80. Ninds_000089

81. Hms1568j09

82. Hms1921o10

83. Hms2092o08

84. Hms2095j09

85. Hms2230f14

86. Hms3373o15

87. Hms3652k09

88. Hms3712j09

89. Pharmakon1600-01500992

90. Hy-b0526

91. Tox21_110840

92. Ccg-40315

93. Nsc757806

94. S3181

95. Fluoro-methyl-oxo-[?]carboxylic Acid

96. 6,7-dihydro-9-fluoro-5-methyl-1-oxo-1h,5h-quinolizine-2-carboxylic Acid

97. Akos015904879

98. Tox21_110840_1

99. Ac-1284

100. Db08972

101. Hs-0096

102. Nsc 757806

103. Idi1_000089

104. Flumequin 100 Microg/ml In Acetonitrile

105. Ncgc00018211-02

106. Ncgc00018211-04

107. Ncgc00018211-05

108. Ncgc00018211-06

109. Ncgc00018211-10

110. Ncgc00089803-02

111. Ncgc00089803-03

112. Ncgc00178300-01

113. Ncgc00178300-02

114. Sbi-0051623.p002

115. Flumequine 1000 Microg/ml In Acetonitrile

116. F0832

117. Ft-0626439

118. Sw196774-3

119. C75146

120. D02302

121. Flumequine, Vetranal(tm), Analytical Standard

122. Ab00052187_17

123. Ab00052187_18

124. 835f256

125. A872809

126. Q-201123

127. Q3074500

128. Sr-01000000130-2

129. Sr-01000000130-4

130. Brd-a69777949-001-05-1

131. Brd-a69777949-001-15-0

132. Flumequine, European Pharmacopoeia (ep) Reference Standard

133. 1h,5h-benzo[ij]quinolizine-2-carboxylic Acid, 9-fluoro-6,7-dihydro-5-methyl-1-oxo

134. 6,7-dihydro-9-fluoro-5-methyl-1-oxo-1h,5h-benzo(i,j)quinolizine-2-carboxylic Acid

135. 6,7dihydro-9-fluoro-5-methyl-1-oxo-1h,5h-benzo[ij]-quinolizine-2-carboxylic Acid

136. 9-fluoro-1,5,6,7-tetrahydro-5-methyl-1-oxopyrido[3,2,1-ij]quinoline-2-carboxylic Acid

137. 7-fluoro-12-methyl-4-oxo-1-azatricyclo[7.3.1.0^{5,13}]trideca-2,5,7,9(13)-tetraene-3-carboxylic Acid

138. Flumequine Solution; 9-fluoro-6,7-dihydro-5-methyl-1-oxo-1h,5h-benzo[ij]quinolizine-2-carboxylic Acid

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 261.25 g/mol
Molecular Formula C14H12FNO3
XLogP32.9
Hydrogen Bond Donor Count1
Hydrogen Bond Acceptor Count5
Rotatable Bond Count1
Exact Mass261.08012141 g/mol
Monoisotopic Mass261.08012141 g/mol
Topological Polar Surface Area57.6 Ų
Heavy Atom Count19
Formal Charge0
Complexity462
Isotope Atom Count0
Defined Atom Stereocenter Count0
Undefined Atom Stereocenter Count1
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Therapeutic Uses

Anti-Infective Agents, Urinary; Topoisomerase II Inhibitors

National Library of Medicine's Medical Subject Headings. Flumequine. Online file (MeSH, 2015). Available from, as of August 20, 2015: https://www.nlm.nih.gov/mesh/2014/mesh_browser/MBrowser.html


Flumequine is a fluoroquinolone compound with antimicrobial activity against Gram-negative organisms. It is used in the treatment of enteric infections in food animals and in the treatment of bacterial infections in farmed fish. Flumequine also has limited use in humans for the treatment of urinary tract infections.

WHO/FAO; WHO Technical Report Series 939, Evaluation of Certain Veterinary Drug Residues in Food, 66th Report of the Joint FAO/WHO Expert Committee on Food Additives (2006). Available from, as of October 13, 2015: https://apps.who.int/iris/bitstream/10665/43464/1/9241209399_eng.pdf


4.2 Drug Warning

The efficacy and safety of flumequine were evaluated in the treatment of 121 cases uncomplicated (65.5%) and complicated (34.5%) urinary tract infections (UTI) when given as a dose of 400 mg bd. Duration of treatment ranged from 7-15 days, with a mean of 10. Thirty days post-therapy, cure persisted in 92.3% of the patients with uncomplicated UTI and in 53.7% of those with complicated UTI. Relapse or re-infection occurred in 34.1% of the patients with complicated UTI, and in 12.2%, the infecting organism did not respond to treatment. Flumequine was generally well tolerated. In 27.3% of patients gastrointestinal, and neurological disorders and skin rashes developed which in most cases were mild. Only two patients were withdrawn from the treatment. It is concluded that flumequine, administered at 800 mg daily, is highly effective in treating uncomplicated and complicated UTI.

PMID:3356617 Schena FP et al; J Antimicrob Chemother 21 (1): 101-6 (1988)


5 Pharmacology and Biochemistry
5.1 MeSH Pharmacological Classification

Topoisomerase II Inhibitors

Compounds that inhibit the activity of DNA TOPOISOMERASE II. Included in this category are a variety of ANTINEOPLASTIC AGENTS which target the eukaryotic form of topoisomerase II and ANTIBACTERIAL AGENTS which target the prokaryotic form of topoisomerase II. (See all compounds classified as Topoisomerase II Inhibitors.)


Anti-Infective Agents, Urinary

Substances capable of killing agents causing urinary tract infections or of preventing them from spreading. (See all compounds classified as Anti-Infective Agents, Urinary.)


5.2 ATC Code

J - Antiinfectives for systemic use

J01 - Antibacterials for systemic use

J01M - Quinolone antibacterials

J01MB - Other quinolones

J01MB07 - Flumequine


5.3 Absorption, Distribution and Excretion

Peak plasma levels occurred in male dogs between 2 and 4 hours after dosing. Peak plasma levels were approximately 55-65 ug flumequine equivalents/mL of plasma after an oral dose of 25 mg/kg bw. Approximately one-half the concentration of total radioactivity for the first 12 hours following administration corresponded to unchanged drug. The disappearance of flumequine from the plasma appeared to follow multi-exponential kinetics with an initial half-life of about 75 minutes and a terminal beta-phase half-life of 6.5 hours.

WHO/FAO; Joint Meeting on Food Additives; Toxicological Evaluation of Certain Veterinary Drug Residues in Food, WHO Food Additive Series 33: Flumequine (1994). Available from, as of October 13, 2015: https://www.inchem.org/pages/jecfa.html


Studies with (14)C-flumequine in dogs and rats indicated that flumequine is readily absorbed following oral administration.

WHO/FAO; Joint Meeting on Food Additives; Toxicological Evaluation of Certain Veterinary Drug Residues in Food, WHO Food Additive Series 33: Flumequine (1994). Available from, as of October 13, 2015: https://www.inchem.org/pages/jecfa.html


There was a significant difference in the mode of drug excretion between dogs and rats. In dogs, 55-75% of the dose was excreted in the faeces compared to only 10-15% in rats. Less than 5% of the dose was present in the urine of dogs as unchanged drug while another 13-15% was excreted as a conjugate of flumequine. In rats, 20-36% of the dose was excreted in urine as unchanged drug and very little as a conjugate of flumequine. The concentrations of free flumequine in the 24-hour urine sample were about the same for both species.

WHO/FAO; Joint Meeting on Food Additives; Toxicological Evaluation of Certain Veterinary Drug Residues in Food, WHO Food Additive Series 33: Flumequine (1994). Available from, as of October 13, 2015: https://www.inchem.org/pages/jecfa.html


Total recovery of the orally administered dose was achieved in the urine and feces within 5 days after dosing in both species /rats and dogs/, indicating that very little residual flumequine and/or metabolites were retained in the tissues.

WHO/FAO; Joint Meeting on Food Additives; Toxicological Evaluation of Certain Veterinary Drug Residues in Food, WHO Food Additive Series 33: Flumequine (1994). Available from, as of October 13, 2015: https://www.inchem.org/pages/jecfa.html


For more Absorption, Distribution and Excretion (Complete) data for FLUMEQUINE (8 total), please visit the HSDB record page.


5.4 Metabolism/Metabolites

In dogs, less than 5% of the dose was excreted in the urine as unchanged drug and 13-15% was excreted as an acid-labile urinary conjugate of flumequine (or a material fluorometrically similar to flumequine). In rats, 20-36% was excreted in the urine as unchanged drug and very little as an acid-labile conjugate.

WHO/FAO; Joint Meeting on Food Additives; Toxicological Evaluation of Certain Veterinary Drug Residues in Food, WHO Food Additive Series 33: Flumequine (1994). Available from, as of October 13, 2015: https://www.inchem.org/pages/jecfa.html


In a 13-week study designed to investigate hepatotoxic lesions and the activities of hepatic drug-metabolizing enzymes, flumequine was administered to male CD-1 mice in the feed at doses equal to 0, 25, 50, 100, 400, or 800 mg/kg bw per day and to females at 0, 100, 400, or 800 mg/kg bw per day. ... Flumequine caused little or no induction of hepatic cytochrome P450-dependent drug-metabolizing enzymes or glucuronyltransferase when given at doses up to 800 mg/kg bw per day. ...

WHO/FAO; Joint Meeting on Food Additives; Toxicological Evaluation of Certain Veterinary Drug Residues in Food, WHO Food Additive Series 39: Flumequine (1997). Available from, as of October 13, 2015: https://www.inchem.org/pages/jecfa.html


To determine the plasma and urine levels of flumequine and its metabolite, 7-hydroxyflumequine, 28 healthy male subjects were given single and multiple oral doses of 400, 800 and 1200 mg flumequine. Results showed mean concentrations at 2 hr of 13.5, 23.8 and 31.9 mg/L, respectively. These levels were sustained up to 6 hr postdose. Following a single 800 mg dose, peak plasma levels of 14-25 mg/L occurred between 2.5 and 3.5 hr. The mean elimination half-life was 7.1 hr. In plasma only minimal levels of 7-hydroxyflumequine were found. Following 800 mg of flumequine four times a day, mean trough plasma levels of unchanged drug ranged from 21-23 mg/L. Mean peak concentrations were 41 mg/L at steady-state. The half-life following the last dose (8.5 hr) was not significantly different from the 7.1 hr half-life following the first dose. Substantial drug levels were present in the urine for 24 hr following single oral doses of 400, 800 and 1200 mg of flumequine. Urine levels of 7-hydroxyflumequine were generally higher than the parent compound. In the multiple dose study, the overnight concentration of flumequine always exceeded 50 mg/L, and the overnight concentration of 7-hydroxyflumequine always exceeded 80 mg/L.

Schuppan D et al; J Antimicrob Chemother 15 (3): 337-343 (1985)


5.5 Biological Half-Life

... /In rats/ after administration of the 25 mg/kg bw oral dose ... the plasma half-life for flumequine was 5.25 hours.

WHO/FAO; Joint Meeting on Food Additives; Toxicological Evaluation of Certain Veterinary Drug Residues in Food, WHO Food Additive Series 33: Flumequine (1994). Available from, as of October 13, 2015: https://www.inchem.org/pages/jecfa.html


... /In male dogs/ after an oral dose of 25 mg/kg bw ... the disappearance of flumequine from the plasma appeared to follow multi-exponential kinetics with an initial half-life of about 75 minutes and a terminal beta-phase half-life of 6.5 hours.

WHO/FAO; Joint Meeting on Food Additives; Toxicological Evaluation of Certain Veterinary Drug Residues in Food, WHO Food Additive Series 33: Flumequine (1994). Available from, as of October 13, 2015: https://www.inchem.org/pages/jecfa.html


... After IV and oral administration /in chickens/ (single-dose of 12 mg flumequine/kg bw ... elimination half-life and mean residence time of flumequine in plasma were 6.91 and 5.90 hr, respectively, after IV administration and 10.32 and 8.95 hr after oral administration. ...

PMID:1795097 Anadon A et al; Food Chem Toxicol 46 (2): 662-70 (2008)


To determine the plasma and urine levels of flumequine and its metabolite, 7-hydroxyflumequine, 28 healthy male subjects were given single and multiple oral doses of 400, 800 and 1200 mg flumequine. ... Following a single 800 mg dose, peak plasma levels of 14-25 mg/L occurred between 2.5 and 3.5 hr. The mean elimination half-life was 7.1 hr. ... Following 800 mg of flumequine four times a day ... the half-life following the last dose (8.5 hr) was not significantly different from the 7.1 hr half-life following the first dose.

Schuppan D et al; J Antimicrob Chemother 15 (3): 337-343 (1985)