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Chemistry

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Also known as: 72-14-0, Sulphathiazole, Sulfathiazol, 2-sulfanilamidothiazole, Sulfanilamidothiazole, Thiazamide
Molecular Formula
C9H9N3O2S2
Molecular Weight
255.3  g/mol
InChI Key
JNMRHUJNCSQMMB-UHFFFAOYSA-N
FDA UNII
Y7FKS2XWQH

Cerazole
A sulfathiazole compound that is used as a short-acting anti-infective agent. It is no longer commonly used systemically due to its toxicity, but may still be applied topically in combination with other drugs for the treatment of vaginal and skin infections, and is still used in veterinary medicine.
1 2D Structure

Cerazole

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
4-amino-N-(1,3-thiazol-2-yl)benzenesulfonamide
2.1.2 InChI
InChI=1S/C9H9N3O2S2/c10-7-1-3-8(4-2-7)16(13,14)12-9-11-5-6-15-9/h1-6H,10H2,(H,11,12)
2.1.3 InChI Key
JNMRHUJNCSQMMB-UHFFFAOYSA-N
2.1.4 Canonical SMILES
C1=CC(=CC=C1N)S(=O)(=O)NC2=NC=CS2
2.2 Other Identifiers
2.2.1 UNII
Y7FKS2XWQH
2.3 Synonyms
2.3.1 MeSH Synonyms

1. 4-amino-n-2-thiazolyl Benzenesulfonamide

2. Alphadol

3. Benzenesulfonamide, 4 Amino N 2 Thiazolyl

4. Benzenesulfonamide, 4-amino-n-2-thiazolyl

5. N(1)-2-thiazolylsulfanilamide

6. Norsulfazole

7. Sulfathiazole Sodium

8. Sulfathiazole, Monosodium Salt

2.3.2 Depositor-Supplied Synonyms

1. 72-14-0

2. Sulphathiazole

3. Sulfathiazol

4. 2-sulfanilamidothiazole

5. Sulfanilamidothiazole

6. Thiazamide

7. Norsulfazole

8. 4-amino-n-(thiazol-2-yl)benzenesulfonamide

9. 2-sulfonamidothiazole

10. Norsulfasol

11. 2-(sulfanilylamino)thiazole

12. Neostrepsan

13. Sulfocerol

14. Thiozamide

15. Sulzol

16. 2-sulfanilamidothiazol

17. 2-(p-aminobenzenesulfonamido)thiazole

18. Azoquimiol

19. Azoseptale

20. Norsulfazol

21. Poliseptil

22. Sanotiazol

23. Sulfathiazolum

24. Sulfatiazol

25. Thiacoccine

26. Thiasulfol

27. Wintrazole

28. Cerazole

29. Chemosept

30. Cibazol

31. Eleudron

32. Estafilol

33. Planomide

34. Septozol

35. Duatok

36. Dulana

37. N(1)-2-thiazolylsulfanilamide

38. Coco-thiazole

39. Formosulfathiazole

40. Streptosilthiazole

41. 4-amino-n-2-thiazolylbenzenesulfonamide

42. Sulfamul

43. 2-(p-aminobenzenesulphonamido)thiazole

44. Usaf Sn-9

45. Cerazol (suspension)

46. Ciba 3714

47. 4-amino-n-(1,3-thiazol-2-yl)benzenesulfonamide

48. N1-(2-thiazolyl)sulfanilamide

49. Benzenesulfonamide, 4-amino-n-2-thiazolyl-

50. 4-amino-n-(1,3-thiazol-2-yl)benzene-1-sulfonamide

51. N1-2-thiazolylsulfanilamide

52. 4-amino-n-1,3-thiazol-2-ylbenzenesulfonamide

53. M&b 760

54. Rp 2090

55. Sulfanilamide, N1-2-thiazolyl-

56. 4-amino-n-thiazol-2-yl-benzenesulfonamide

57. 2090 R.p.

58. N(sup 1)-2-thiazolylsulfanilamide

59. M+b 760

60. Chebi:9337

61. Y7fks2xwqh

62. Nsc-31812

63. Chembl437

64. Nsc-683531

65. Triple Sulfa (sulfathiazole)

66. N'-(2-thiazolyl)sulfanilamide

67. N(sup1)-(2-thiazolyl)sulfanilamide

68. Nsc683531

69. Sulfanilamide, N(sup1)-2-thiazolyl-

70. Cas-72-14-0

71. Ncgc00016309-02

72. Ncgc00016309-06

73. Norsulfazolum

74. Sulfathiazole 100 Microg/ml In Acetonitrile

75. Dsstox_cid_6068

76. Dsstox_rid_78004

77. Dsstox_gsid_26068

78. Solfatiazolo [dcit]

79. Caswell No. 809b

80. Solfatiazolo

81. Sulfathiazol [inn-french]

82. Sulfatiazol [inn-spanish]

83. Sulfathiazolum [inn-latin]

84. Ccris 765

85. 2090 Rp

86. 2-sulfanilamidothiazol [german]

87. Hsdb 4380

88. Sr-05000001722

89. Unii-y7fks2xwqh

90. Sulfanilamide, N(1)-2-thiazolyl-

91. Einecs 200-771-5

92. Nsc 31812

93. Epa Pesticide Chemical Code 077903

94. Nsc 683531

95. Sulfanilamide, N(sup 1)-2-thiazolyl-

96. Sulfthiazole

97. Enterobiocine

98. Sulfavitina

99. Cerazol

100. Ai3-01050

101. Sulfathiazole [usp:inn:ban]

102. 2-sulfathiazole

103. Ytz

104. Prestwick_430

105. Mfcd00005319

106. Sulfathiazole-13c6

107. Spectrum_001000

108. 4-amino-n-(2-thiazolyl)benzenesulfonamide

109. Prestwick0_000016

110. Prestwick1_000016

111. Prestwick2_000016

112. Prestwick3_000016

113. Spectrum2_000841

114. Spectrum3_001729

115. Spectrum4_000348

116. Spectrum5_001441

117. Sulfathiazole (usp/inn)

118. N-2-thiazolylsulfanilamide

119. Sulfathiazole [mi]

120. Epitope Id:122234

121. Sulfathiazole [inn]

122. Cambridge Id 5251400

123. Cid_5340

124. Sulfathiazole [hsdb]

125. Oprea1_105970

126. Oprea1_297844

127. Schembl94165

128. Bspbio_000051

129. Bspbio_003378

130. Kbiogr_000755

131. Kbioss_001480

132. Sulfathiazole [vandf]

133. [(4-aminophenyl)sulfonyl]-1,3-thiazol-2-ylamine

134. Mls002154174

135. N-1-2-thiazolylsulfanilamide

136. Divk1c_000560

137. Spectrum1500553

138. Sulfathiazole [mart.]

139. Sulfathiazole-d4(benzene-d4)

140. Spbio_000821

141. Spbio_001972

142. Sulfathiazole [usp-rs]

143. Sulfathiazole [who-dd]

144. Bpbio1_000057

145. Wln: T5n Csj Bmswr Dz

146. Dtxsid8026068

147. Hms501l22

148. Kbio1_000560

149. Kbio2_001480

150. Kbio2_004048

151. Kbio2_006616

152. Kbio3_002598

153. N(sup1)-2-thiazolylsulfanilamide

154. Ninds_000560

155. Hms1568c13

156. Hms1921c07

157. Hms2092k09

158. Hms2095c13

159. Hms2259a13

160. Hms3652a03

161. Hms3712c13

162. Pharmakon1600-01500553

163. Sulfathiazole [green Book]

164. Zinc121458

165. Sulfathiazole [orange Book]

166. Amy33440

167. Hy-b0507

168. Nsc31812

169. Sulfathiazole (triple Sulfa)

170. Sulfathiazole [ep Monograph]

171. Tox21_110363

172. Tox21_202243

173. Tox21_303238

174. Bdbm50027796

175. Ccg-40296

176. Nsc757331

177. S3116

178. Stk043870

179. Sulfathiazole [usp Monograph]

180. Trysul Component Sulfathiazole

181. 2-(4-aminobenzenesulfonamido)thiazole

182. Sultrin Component Sulfathiazole

183. Vagilia Component Sulfathiazole

184. Akos000108630

185. Tox21_110363_1

186. Db06147

187. Nsc-757331

188. Sdccgmls-0065585.p001

189. Gyne-sulf Component Sulfathiazole

190. Idi1_000560

191. Sulfathiazole Component Of Trysul

192. Ncgc00016309-01

193. Ncgc00016309-03

194. Ncgc00016309-04

195. Ncgc00016309-05

196. Ncgc00016309-07

197. Ncgc00016309-08

198. Ncgc00016309-09

199. Ncgc00016309-10

200. Ncgc00016309-14

201. Ncgc00091133-01

202. Ncgc00091133-02

203. Ncgc00091133-03

204. Ncgc00091133-04

205. Ncgc00257187-01

206. Ncgc00259792-01

207. Sulfathiazole 100 Microg/ml In Methanol

208. Sulfathiazole Component Of Sultrin

209. Sulfathiazole Component Of Vagilia

210. Ac-12783

211. Ds-17245

212. Nci60_002730

213. Smr000017368

214. Pyridine,2-(chloromethyl)-3,4-dimethoxy-

215. Sbi-0051527.p004

216. Sulfanilamide, N1-4-thiazolin-2-ylidene-

217. Db-055610

218. Sulfathiazole Component Of Gyne-sulf

219. 4-amino-n-(thiazol-2-yl)-benzenesulfonamide

220. Ab00052102

221. Bb 0245015

222. Ft-0631310

223. Sw149625-4

224. 4-[(1,3-thiazol-2-yl)aminosulfonyl]aniline

225. Sulfathiazole, Analytical Standard, >=98.0%

226. D01047

227. D70411

228. Ab00052102_14

229. Ab00052102_15

230. Q408427

231. Sulfathiazole, Vetranal(tm), Analytical Standard

232. Triple Sulfa (sulfathiazole) [orange Book]

233. 4-amino-n-(1,3-thiazol-2-yl)benzenesulfonamide #

234. Q-201765

235. Sr-05000001722-1

236. Sr-05000001722-3

237. Sulfathiazole, Antibiotic For Culture Media Use Only

238. Brd-k14705039-001-05-7

239. Brd-k14705039-001-08-1

240. F1443-4816

241. Sulfathiazole, European Pharmacopoeia (ep) Reference Standard

242. Sulfathiazole, United States Pharmacopeia (usp) Reference Standard

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 255.3 g/mol
Molecular Formula C9H9N3O2S2
XLogP30.1
Hydrogen Bond Donor Count2
Hydrogen Bond Acceptor Count6
Rotatable Bond Count3
Exact Mass255.01361889 g/mol
Monoisotopic Mass255.01361889 g/mol
Topological Polar Surface Area122 Ų
Heavy Atom Count16
Formal Charge0
Complexity320
Isotope Atom Count0
Defined Atom Stereocenter Count0
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

Anti-Infective Agents /SRP: Antibacterial/

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


The US FDA announced on May 31, 1979, that its Anti-infective and Topical Drugs Advisory Committee and Fertility and Maternal health Advisory Committee, as well as other studies, had concluded there was no adequate evidence that the then-available vaginal sulfonamides formulations were effective either for the treatment of vulvovaginitis caused by Candida albicans, trichomonas vaginalis, or Gardnerella vaginalis (Hemophilus vaginalis) or for relief of the symptoms of these conditions. /Sulfonamides/

USP. Convention. USPDI - Drug Information for the Health Care Professional. 20th ed. Volume I. Micromedex, Inc. Englewood, CO., 2000. Content Reviewed and Approved by the U.S. Pharmacopeial Convention, Inc., p. 2857


In the opinion of USP medical experts, triple sulfa vaginal preparations are not effective for any indication, including vulvovaginitis caused by Gardnerella vaginalis and use as a deodorant in saprophytic infections following radiation therapy. Also, USP medical experts do not recommend the use of vaginal sulfonamides, including the reformulated single-entry preparations, for the treatment of fungal infections of the vagina. /Sulfonamides/

USP. Convention. USPDI - Drug Information for the Health Care Professional. 20th ed. Volume I. Micromedex, Inc. Englewood, CO., 2000. Content Reviewed and Approved by the U.S. Pharmacopeial Convention, Inc., p. 2857


MEDICATION (VET): Antibacterial

Budavari, S. (ed.). The Merck Index - An Encyclopedia of Chemicals, Drugs, and Biologicals. Whitehouse Station, NJ: Merck and Co., Inc., 1996., p. 1529


For more Therapeutic Uses (Complete) data for SULFATHIAZOLE (8 total), please visit the HSDB record page.


4.2 Drug Warning

The number of conditions for which the sulfonamides are therapeutically useful and constitute drugs of first choice has been reduced sharply by the development of more effective antimicrobial agents and by the gradual increase in the resistance of a number of bacterial species to this class of drugs. /Sulfonamides/

Hardman, J.G., L.E. Limbird, P.B. Molinoff, R.W. Ruddon, A.G. Goodman (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 9th ed. New York, NY: McGraw-Hill, 1996., p. 1062


Many of the adverse effects that have been attributed to the sulfonamides appear to be hypersensitivity reactions. The incidence of hypersensitivity reactions appears to increase with increased sulfonamide dosage. Although cross-sensitization has been reported to occur between the various anti-infective sulfonamides, some diuretics such as acetazolamide and the thiazides, some goitrogens, and sulfonylurea antidiabetic agents, the association between hypersensitivity to sulfonamide anti-infectives and subsequent sensitivity reactions to non-anti-infective sulfonamides (e.g., thiazides, sulfonylurea antidiabetic agents, furosemide, dapsone, probenecid) appears to result from a predisposition to allergic reactions in general rather than to cross-sensitivity to the sulfa moiety per se. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 423


Various dermatologic reactions, including rash, pruritus, urticaria, erythema nodosum, erythema multiforme (Stevens-Johnson syndrome), Lyell's syndrome (may be associated with corneal damage), Behcet's syndrome, toxic epidermal necrolysis, and exfoliative dermatitis, have been reported in patients receiving sulfonamides. Because photosensitivity may also occur, patients should be cautioned against exposure to UV light or prolonged exposure to sunlight. A relatively high proportion of fatalities has occurred as a result of the Stevens-Johnson syndrome, especially in children. Although long-acting sulfonamides (which are no longer commercially available) have been associated most often with the Stevens-Johnson syndrome, other sulfonamides also have been reported to cause this reaction. The physician should be alert to the signs, including high fever, severe headache, stomatitis, conjunctivitis, rhinitis, urethritis, and balanitis, which may precede the onset of the cutaneous lesions of the Stevens-Johnson syndrome. If a rash develops during therapy, the sulfonamide should be discontinued at once. In rare instances, a skin rash may precede a more serious reaction such as Stevens-Johnson syndrome, toxic epidermal necrolysis, hepatic necrosis, and/or serious blood disorders. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 423


Fever, which may develop 7-10 days after the initial sulfonamide dose, is a common adverse effect of sulfonamide therapy. Serum sickness syndrome or serum sickness-like reactions (e.g., fever, chills, rigors, flushing, joint pain, urticarial eruptions, conjunctivitis, bronchospasm, leukopenia), have been reported; rarely, anaphylactoid reactions and anaphylaxis may occur. Lupus erythematosus-like syndrome, disseminated lupus erythematosus, angioedema, vasculitis, vascular lesions including periarteritis nodosa and arteritis, cough, shortness of breath, chills, pulmonary infiltrates, pneumonitis (which may be associated with eosinophilia), fibrosing alveolitis, pleuritis, pericarditis with or without tamponade, allergic myocarditis, hepatitis, hepatic necrosis with or without immune complexes, parapsoriasis varioliformis acuta, alopecia, conjunctival and scleral injection, periorbital edema, and arthralgia have also been reported. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 423


For more Drug Warnings (Complete) data for SULFATHIAZOLE (23 total), please visit the HSDB record page.


4.3 Drug Indication

Sulfathiazole is effective against a wide range of gram positive and gram negative pathogenic microorganisms. Although no longer used in humans, it is used in cattle.


5 Pharmacology and Biochemistry
5.1 MeSH Pharmacological Classification

Anti-Infective Agents

Substances that prevent infectious agents or organisms from spreading or kill infectious agents in order to prevent the spread of infection. (See all compounds classified as Anti-Infective Agents.)


5.2 ATC Code

D06BA02

S66 | EAWAGTPS | Parent-Transformation Product Pairs from Eawag | DOI:10.5281/zenodo.3754448


D06BA02

S66 | EAWAGTPS | Parent-Transformation Product Pairs from Eawag | DOI:10.5281/zenodo.3754448


D06BA02

S66 | EAWAGTPS | Parent-Transformation Product Pairs from Eawag | DOI:10.5281/zenodo.3754448


D06BA02

S66 | EAWAGTPS | Parent-Transformation Product Pairs from Eawag | DOI:10.5281/zenodo.3754448


D - Dermatologicals

D06 - Antibiotics and chemotherapeutics for dermatological use

D06B - Chemotherapeutics for topical use

D06BA - Sulfonamides

D06BA02 - Sulfathiazole


J - Antiinfectives for systemic use

J01 - Antibacterials for systemic use

J01E - Sulfonamides and trimethoprim

J01EB - Short-acting sulfonamides

J01EB07 - Sulfathiazole


5.3 Absorption, Distribution and Excretion

Individual sulfonamides differ markedly in their absorption, distribution, and elimination. With the exception of sulfapyrimidine and sulfasalazine, which are only slightly absorbed, sulfonamides are generally well absorbed from the GI tract. Approximately 70-90% of an oral dose of the absorbable sulfonamides is reportedly absorbed from the small intestine; small amounts may also be absorbed from the stomach. Sulfamethizole and sulfisoxazole (no longer commercially available in the US) are absorbed rapidly; peak blood concentrations are usually obtained within 2-4 hours. Sulfadiazine and sulfapyridine are absorbed at a slower rate with peak blood concentrations occurring within 3-7 hours. Administration of oral sulfonamides with food appears to delay, but not reduce, absorption of the drugs. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 425


Absorption of sulfonamides from the vagina, respiratory tract, or abraded skin is variable and unreliable; however, enough drug may be absorbed to induce sensitization or toxicity. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 425


Although only free (unmetabolized and unbound) sulfonamides are microbiologically active, blood concentrations are often determined on the basis of total sulfonamide concentration. Generally, sulfonamide plasma concentrations are approximately twice the blood concentrations. Wide variations in blood concentrations have been reported in different individuals receiving identical doses of the same sulfonamide. Blood total sulfonamide concentrations of 12-15 mg/dL have been reported to be optimal; blood concentrations greater than 20 mg/dL have been associated with an increased incidence of adverse reactions. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 425


Absorbable sulfonamides are widely distributed in the body. Although most sulfonamides appear to cross cell membranes, sulfisoxazole appears to be distributed only in extracellular fluid. Sulfonamides may appear in pleural, peritoneal, synovial, amniotic, prostatic, and seminal vesicular fluid, and aqueous humor. Concentrations of some sulfonamides in the CSF may reach 35-80% of blood concentrations. Small amounts of sulfonamides are also distributed into sweat, tears, saliva, and bile. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 425


For more Absorption, Distribution and Excretion (Complete) data for SULFATHIAZOLE (16 total), please visit the HSDB record page.


5.4 Metabolism/Metabolites

Metabolism of sulfonamide drugs in animals includes conjugation at the N4-position (acetyl, sulfate, glucuronic acid, and glucose), conjugation at the N1-position (sulfate and glucuronic acid), removal of the p-amino group (formation of the desamino metabolite), ring hydroxylation, and conjugation of the ring hydroxylation products. Dietary nitrite enhances the production of the desamino metabolite of sulfathiazole. The intermediate leading to the desamino metabolite of sulfamethazine is weakly mutagenic in the Ames test (Nelson et al., 1987; Paulson et al., 1987).


Although the liver is the major site of metabolism, sulfonamides may also be metabolized in other body tissues. Most sulfonamides are metabolized mainly by N4-acetylation. The degree of acetylation, which is a function of time, varies from less than 5% for sulfamethizole to up to 40% for sulfadiazine. The N4-acetyl metabolites, which do not possess antibacterial activity, have greater affinity for plasma albumin than does the nonacetylated drug and are usually less soluble than the parent sulfonamide, particularly in acidic urine. Like acetyl derivatives, glucuronide derivatives do not possess antibacterial activity; however, glucuronide derivatives are water soluble, appear to resemble the nonacetylated sulfonamide in plasma binding capacity, and have not been associated with adverse effects. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 425


Metabolism of sulfonamide drugs in animals includes conjugation at the N4-position (acetyl, sulfate, glucuronic acid, and glucose), conjugation at the N1-position (sulfate and glucuronic acid), removal of the p-amino group (formation of the desamino metabolite), ring hydroxylation, and conjugation of the ring hydroxylation products. Dietary nitrite enhances the production of the desamino metabolite of sulfathiazole.

WHO/FAO; Joint Expert Committee on Food Additives; Food Additive Series 25: Sulfathiazloe (72-14-0) (1990). Available from, as of July 21, 2008: https://www.inchem.org/pages/jecfa.html


Sulfathiazole...is one of the short-acting sulfonamides & in man is excreted in urine as unchanged sulfathiazole (63% of dose), N4-acetylsulfathiazole (29%), sulfathiazole-N4-glucuronide (0.8%), sulfathiazole-N4-sulfate (0.5%) & sulfathiazole-N1-glucuronide (3.8%).

Parke, D. V. The Biochemistry of Foreign Compounds. Oxford: Pergamon Press, 1968., p. 180


Deposition kinetics, metabolism and urinary excretion of sulfathiazole were investigated in German black head sheep following single oral administration (100 mg/kg). Kinetic evaluation of plasma levels was performed using a two-compartment best fit model. Sulfathiazole is significantly metabolized to N4-acetyl metabolite in the rumen fluid. The drug is very poorly absorbed since the minimum effective concentration in plasma was not attained at any time following oral administration. The prolonged elimination half-life in sheep may be due to a low rate of drug absorption from the rumen and gastro-intestinal tract. Sulfathiazole was mainly excreted in the urine as free drug and N4-acetyl metabolite.

PMID:8591739 Jain S, Hapke H; Dtsch Tierarztl Wochenschr 102 (10): 394-5 (1995)


For more Metabolism/Metabolites (Complete) data for SULFATHIAZOLE (6 total), please visit the HSDB record page.


5.5 Biological Half-Life

Sulfonamides are generally classified as short-acting, intermediate-acting, or long-acting depending on the rate at which they are absorbed and eliminated. Sulfamethizole, sulfasalazine, and sulfisoxazole are generally considered to be short-acting sulfonamides and reportedly have plasma half-lives of about 4-8 hours. Sulfadiazine and sulfapyridine are generally considered to be intermediate-acting sulfonamides and reportedly have plasma half-lives of about 7-17 hours. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 425


The plasma, urine, and tissue sulfathiazole concentrations were determined at various times following intravenous administration to 12 sheep. The plasma and urine data were consistent with a one-compartment pharmacokinetic model, with an elimination half-life of 1.1 hr...

PMID:903868 Bevill R et al; J Pharm Sci 66 (9): 1297-300 (1977)


5.6 Mechanism of Action

Sulfonamides are usually bacteriostatic in action. Sulfonamides interfere with the utilization of p-aminobenzoic acid (PABA) in the biosynthesis of tetrahydrofolic acid (the reduced form of folic acid) cofactors in susceptible bacteria. Sulfonamides are structural analogs of PABA and appear to interfere with PABA utilization by competitively inhibiting the enzyme dihydropteroate synthase, which catalyzes the formation of dihydropteroic acid (a precursor of tetrahydrofolic acid) from PABA and pteridine; however, other mechanism(s) affecting the biosynthetic pathway also may be involved. Compounds such as pyrimethamine and trimethoprim, which block later stages in the synthesis of folic acid, act synergistically with sulfonamides. Only microorganisms that synthesize their own folic acid are inhibited by sulfonamides; animal cells and bacteria which are capable of utilizing folic acid precursors or preformed folic acid are not affected by these drugs. The antibacterial activity of the sulfonamides is reportedly decreased in the presence of blood or purulent body exudates. /Sulfonamides/

American Society of Health System Pharmacists. AHFS Drug Information 2008. Bethesda, Maryland 2008, p. 424


The sulfonamides are structural analogs of para-aminobenzoic acid (PABA) and competitively inhibit an enzymatic step (dihydropterate synthetase) during which PABA is incorporated into the synthesis of dihydrofolic acid (folic acid). Because dihydrofolate synthesis is reduced, the levels of tetrahydrofolate (folinic acid) formed from dihydrofolate diminish. Tetrahydrofolate is an essential component of the coenzymes responsible for single carbon metabolism in cells. Acting as antimetabolites to PABA, sulfonamides eventually block, in a complex fashion, several enzymes. These enzymes include those needed for the biogenesis of purine bases; for the transfer of desoxyuridine to thymidine; and for the biosynthesis of methionine, glycine, and formylmethionyl-transfer-RNA. This results in suppression of protein synthesis, impairment of metabolic processes, and inhibition of growth and multiplication of those organisms that cannot use preformed folate. The effect is bacteriostatic, although a bactericidal action is evident at the high concentrations that may be found in urine.

Kahn, C.M. (Ed.); The Merck Veterinary Manual 9th ed. Merck & Co. Whitehouse Station, NJ. 2005, p. 2076


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