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Prestwick3_000533
Also known as: N-(4-ethoxyphenyl)acetamide, 62-44-2, Acetophenetidin, Acetphenetidin, Acetophenetidine, Acetophenetin
Molecular Formula
C10H13NO2
Molecular Weight
179.22  g/mol
InChI Key
CPJSUEIXXCENMM-UHFFFAOYSA-N
FDA UNII
ER0CTH01H9

A phenylacetamide that was formerly used in ANALGESICS but nephropathy and METHEMOGLOBINEMIA led to its withdrawal from the market. (From Smith and Reynard, Textbook of Pharmacology,1991, p431)
1 2D Structure

Prestwick3_000533

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
N-(4-ethoxyphenyl)acetamide
2.1.2 InChI
InChI=1S/C10H13NO2/c1-3-13-10-6-4-9(5-7-10)11-8(2)12/h4-7H,3H2,1-2H3,(H,11,12)
2.1.3 InChI Key
CPJSUEIXXCENMM-UHFFFAOYSA-N
2.1.4 Canonical SMILES
CCOC1=CC=C(C=C1)NC(=O)C
2.2 Other Identifiers
2.2.1 UNII
ER0CTH01H9
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Acetophenetidin

2.3.2 Depositor-Supplied Synonyms

1. N-(4-ethoxyphenyl)acetamide

2. 62-44-2

3. Acetophenetidin

4. Acetphenetidin

5. Acetophenetidine

6. Acetophenetin

7. Phenacetine

8. P-acetophenetidide

9. Phenazetin

10. Achrocidin

11. Phenacetinum

12. Fenidina

13. Kalmin

14. 4'-ethoxyacetanilide

15. Contradouleur

16. Codempiral

17. Commotional

18. Contradol

19. 4-ethoxyacetanilide

20. Acetamide, N-(4-ethoxyphenyl)-

21. P-acetophenetidine

22. Fenacetina

23. Pertonal

24. Phenacet

25. Phenacitin

26. Phenedina

27. Phenidin

28. Pyraphen

29. Fenina

30. P-ethoxyacetanilide

31. Phenin

32. P-acetophenetide

33. P-acetphenetidin

34. Phenazetina

35. Tetracydin

36. Clistanol

37. Coriforte

38. Daprisal

39. Dasikon

40. Dolostop

41. Edrisal

42. Empiral

43. Emprazil

44. Epragen

45. Fortacyl

46. Gelonida

47. Gewodin

48. Helvagit

49. Hocophen

50. Melabon

51. Melaforte

52. Pamprin

53. Paramette

54. Paratodol

55. Phenodyne

56. Pyrroxate

57. Quadronal

58. Salgydal

59. Sanalgine

60. Saridon

61. Seranex

62. Sinedal

63. Sinubid

64. Sinutab

65. Stellacyl

66. Synalogos

67. Treupel

68. Veganine

69. Anapac

70. Fenia

71. Malex

72. Tacol

73. Viden

74. Xaril

75. Acetylphenetidin

76. Para-phenacetin

77. Bromo Seltzer

78. Kafa

79. Phenaphen Plus

80. Robaxisal-ph

81. Aceto-4-phenetidine

82. Citra-fort

83. Super Anahist

84. Dasin Ch

85. Emprazil-c

86. Acet-p-phenalide

87. Coryban-d

88. Paracetophenetidin

89. Hjorton's Powder

90. Acet-p-phenetidin

91. Thephorin A-c

92. N-acetyl-p-phenetidine

93. Buff-a-comp

94. Para-acetphenetidin

95. 1-acetamido-4-ethoxybenzene

96. Fiorinal

97. Sinutabs

98. Aceto-para-phenalide

99. Para-acetophenetidide

100. Darvon Compound

101. Acetanilide, 4'-ethoxy-

102. Synalgos-dc

103. P-phenetidine, N-acetyl-

104. Aceto-para-phenetidide

105. Fenacetin [czech]

106. Rcra Waste Number U187

107. Para-acetophenetidine

108. Fenacetin

109. Para-ethoxyacetanilide

110. Fenacetina [inn-spanish]

111. Acetamide, N-(4-ethoxyphenol)-

112. N-para-ethoxyphenylacetamide

113. Ccris 496

114. Hsdb 3152

115. N-acetyl-4-ethoxyaniline

116. P-ethoxyanilid Kyseliny Octove

117. P-ethoxyanilid Kyseliny Octove [czech]

118. Brn 1869238

119. Acetic Acid Amide, N-(4-ethoxyphenyl)-

120. Ai3-00783

121. Nsc-7651

122. 4-(acetylamino)phenetole

123. Er0cth01h9

124. Dolviran

125. 4-ethoxy-1-acetylaminobenzene

126. Chebi:8050

127. 69323-74-6

128. N-[4-(ethyloxy)phenyl]acetamide

129. Phenacetin Melting Point Standard

130. 40674-52-0

131. Cas-62-44-2

132. Ncgc00016281-06

133. Dsstox_cid_1116

134. Dsstox_rid_75948

135. Dsstox_gsid_21116

136. Acetamide, N-(4-ethoxyphenyl)-, Labeled With Tritium

137. N-acetyl-para-phenetidine

138. Phenacetine [inn-french]

139. Phenacetinum [inn-latin]

140. Smr000752916

141. 1-acetyl-p-phenetidin

142. Sr-01000787183

143. Nsc 7651

144. Einecs 200-533-0

145. Rcra Waste No. U187

146. Unii-er0cth01h9

147. Terracydin

148. Phenacetin [usp:inn:jan]

149. N-(4-ethoxyphenyl)-acetamide

150. Zactirin Compound

151. P-acetophenetitide

152. Prestwick_862

153. Phenacetin, 97%

154. 4-ethoxy-acetanilid

155. N-acetylphenetylamine

156. Mfcd00009094

157. 4-ethoxy-acetanilide

158. Asa Compound

159. Butigetic (salt/mix)

160. Spectrum_000782

161. Acetanilide, P-ethoxy-

162. Phenacetin [mi]

163. Phenacetin (jan/inn)

164. Phenacetin-ethoxy-[d5]

165. N-acetyl-p-ethoxyaniline

166. Phenacetin [inn]

167. Phenacetin [jan]

168. Prestwick0_000533

169. Prestwick1_000533

170. Prestwick2_000533

171. Prestwick3_000533

172. Spectrum2_001940

173. Spectrum3_001404

174. Spectrum4_000515

175. Spectrum5_001902

176. Phenacetin [hsdb]

177. Phenacetin [iarc]

178. Phenacetin [inci]

179. P-acetophenetidide (8ci)

180. Phenacetin [vandf]

181. Phenacetinum [hpus]

182. Phenacetin [mart.]

183. Wln: 2or Dmv1

184. Phenacetin [usp-rs]

185. Phenacetin [who-dd]

186. Schembl23280

187. 4'-ethoxyacetanilide, 97%

188. Bspbio_000545

189. Bspbio_003048

190. Kbiogr_001089

191. Kbioss_001262

192. N-(4-ethoxyphenyl)ethanamide

193. Zinc602

194. Mls001304971

195. Mls002153862

196. Mls002303055

197. Chembl16073

198. Divk1c_000580

199. P-a-c Compound (salt/mix)

200. Spectrum1500642

201. Phenacetin [analgesic Mixtures Containing Phenacetin]

202. Spbio_001979

203. Spbio_002466

204. Bpbio1_000601

205. Gtpl7402

206. Dtxsid1021116

207. Schembl20476396

208. Hms501m22

209. Kbio1_000580

210. Kbio2_001262

211. Kbio2_003830

212. Kbio2_006398

213. Kbio3_002268

214. Nsc7651

215. Ninds_000580

216. Hms1569l07

217. Hms1921m21

218. Hms2092e14

219. Hms2096l07

220. Hms2234p11

221. Hms3373i02

222. Hms3651n07

223. Hms3713l07

224. Hms3884h10

225. Pharmakon1600-01500642

226. Bcp09084

227. Hy-b0476

228. Phenacetin, >=98.0% (hplc)

229. Tox21_110347

230. Tox21_201926

231. Tox21_302895

232. Bdbm50420191

233. Ccg-39439

234. Nsc757401

235. Stk011463

236. Akos000370201

237. Phenacetin 1.0 Mg/ml In Acetonitrile

238. Phenacetin 100 Microg/ml In Methanol

239. Tox21_110347_1

240. Db03783

241. Nsc-757401

242. Idi1_000580

243. Acetamide, N-(4-ethoxyphenyl)- (9ci)

244. Ncgc00016281-01

245. Ncgc00016281-02

246. Ncgc00016281-03

247. Ncgc00016281-04

248. Ncgc00016281-05

249. Ncgc00016281-07

250. Ncgc00016281-08

251. Ncgc00016281-11

252. Ncgc00091376-01

253. Ncgc00091376-02

254. Ncgc00091376-03

255. Ncgc00091376-04

256. Ncgc00091376-05

257. Ncgc00256345-01

258. Ncgc00259475-01

259. Ac-28909

260. Sbi-0051571.p002

261. Db-054164

262. Phenacetin, Vetec(tm) Reagent Grade, 98%

263. Ab00052135

264. Ft-0631277

265. Ft-0673664

266. P1669

267. S2577

268. Sw196989-3

269. Bim-0051571.0001

270. C07591

271. D00569

272. D84419

273. Ab00052135_10

274. Ab00052135_11

275. A833774

276. Ae-848/04969036

277. Q419175

278. Phenacetin (136 Degrees C) Melting Point Standard

279. Sr-01000787183-2

280. Sr-01000787183-3

281. Brd-k38323065-001-05-8

282. Brd-k38323065-001-09-0

283. Acetophenetidine Acetophenidin Acetylphenetidine Phenacetin

284. Phenacetin, United States Pharmacopeia (usp) Reference Standard

285. Phenacetin Melting Point Standard, United States Pharmacopeia (usp) Reference Standard

286. N4e

287. Phenacetin Melting Point Standard, Pharmaceutical Secondary Standard; Certified Reference Material

288. Phenacetin Solution, 1.0 Mg/ml In Acetonitrile, Ampule Of 1 Ml, Certified Reference Material

2.4 Create Date
2004-09-16
3 Chemical and Physical Properties
Molecular Weight 179.22 g/mol
Molecular Formula C10H13NO2
XLogP31.6
Hydrogen Bond Donor Count1
Hydrogen Bond Acceptor Count2
Rotatable Bond Count3
Exact Mass179.094628657 g/mol
Monoisotopic Mass179.094628657 g/mol
Topological Polar Surface Area38.3 Ų
Heavy Atom Count13
Formal Charge0
Complexity162
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

Analgesics, Non-Narcotic; Enzyme Inhibitors

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


MEDICATION (VET): Analgesic & antipyretic (eg, for treatment of muscle pain); analgesic & antipyretic in veterinary medicine.

SRI


Medication: It is mainly used for mild to moderate pain associated with the musculo-skeletal system.

GENNARO. REMINGTON'S PHARM SCI 17TH ED 1985 p.1114


The so-called coal tar analgesics, phenacetin and its active metabolite acetaminophen, are effective alternatives to aspirin as analgesic-antipyretics; however, unlike aspirin, their anti-inflammatory activity is weak and seldom clinically useful.

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. 656


Acetaminophen and phenacetin have analgesic and antipyretic effects that do not differ significantly from those of aspirin. However ... They have only weak anti-inflammatory effects. The pharmacological effects of phenacetin are a combination of its inherent activity and those of acetaminophen, its major metabolite.

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. 656


4.2 Drug Warning

Individuals with genetically determined limitation in ability to metabolize phenacetin to acetaminophen convert greater fraction of phenacetin to toxic metabolites, possibly with propensity for serious methemoglobin formation & hemolysis.

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. 658


Since single 2-g dose of phenacetin in adults converts only 1-3% of total hemoglobin to methemoglobin, methemoglobinemia produced by therapeutic doses... Is not usually of clinical significance. However, in acute overdosage or during chronic abuse, methemoglobinemia may contribute to total toxicity.

Gilman, A. G., L. S. Goodman, and A. Gilman. (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 6th ed. New York: Macmillan Publishing Co., Inc. 1980., p. 704


Repeated administration is contraindicated in patient with anemia or cardiac, pulmonary, renal, or hepatic disease.

American Hospital Formulary Service. Volumes I and II. Washington, DC: American Society of Hospital Pharmacists, to 1984., p. 28:08


Phenacetin has been said to cause relaxation, drowsiness, euphoria, stimulation, & incr efficiency; such effects have been thought to contribute to its abuse liability.

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. 657


For more Drug Warnings (Complete) data for PHENACETIN (10 total), please visit the HSDB record page.


4.3 Drug Indication

Used principally as an analgesic.


5 Pharmacology and Biochemistry
5.1 Pharmacology

Phenacetin was the first NSAID and fever reducer to go on the market. It acts as an analgesic at the spinal cord as well as a negative inotrope at the heart. It can be used to treat subacute rheumatoid arthritis, intercostal neuralgia, and ataxias.


5.2 MeSH Pharmacological Classification

Analgesics, Non-Narcotic

A subclass of analgesic agents that typically do not bind to OPIOID RECEPTORS and are not addictive. Many non-narcotic analgesics are offered as NONPRESCRIPTION DRUGS. (See all compounds classified as Analgesics, Non-Narcotic.)


5.3 ATC Code

N - Nervous system

N02 - Analgesics

N02B - Other analgesics and antipyretics

N02BE - Anilides

N02BE03 - Phenacetin


5.4 Absorption, Distribution and Excretion

... Oral absorption of phenacetin is markedly influenced by particle size in the preparation, & plasma concentration of phenacetin & acetaminophen are correspondingly variable.

Gilman, A. G., L. S. Goodman, and A. Gilman. (eds.). Goodman and Gilman's The Pharmacological Basis of Therapeutics. 6th ed. New York: Macmillan Publishing Co., Inc. 1980., p. 703


Peak concentration of phenacetin in plasma usually occurs in about 1 hr, & that of acetaminophen derived there from in 1-2 hr.

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. 657


Absorption following oral administration is rapid ... duration of effect is about 4 hr.

Osol, A. (ed.). Remington's Pharmaceutical Sciences. 16th ed. Easton, Pennsylvania: Mack Publishing Co., 1980., p. 1060


Up to 45% of (14)C was recovered in 16 hr urine & 1% in feces of rats given [acetyl-(14)C]phenacetin per oral.

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. 75


For more Absorption, Distribution and Excretion (Complete) data for PHENACETIN (9 total), please visit the HSDB record page.


5.5 Metabolism/Metabolites

Metabolised in the body to paracetamol.


Acetaminophen & phenacetin are metabolized primarily by hepatic microsomal enzymes. ... In normal individual, 75 to 80% of administered phenacetin is rapidly metabolized to acetaminophen.

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. 657


... Phenacetin is converted to at least a dozen other metabolites, by n-deacetylation to para-phenetidin & by hydroxylation & further metabolism of phenacetin & para-phenetidin. An unknown metabolite, but an oxidizing agent, is responsible for methemoglobin formation & hemolysis of red blood cells ... .

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. 657


Phenacetin is metabolized ... to p-acetamidophenol, which is excreted as glucuronide and sulfate conjugate ... .

Parke, D. V. The Biochemistry of Foreign Compounds. Oxford: Pergamon Press, 1968., p. 176


... N-hydroxyphenacetin has been identified as metabolite in ... man.

Testa, B. and P. Jenner. Drug Metabolism: Chemical & Biochemical Aspects. New York: Marcel Dekker, Inc., 1976., p. 63


For more Metabolism/Metabolites (Complete) data for PHENACETIN (15 total), please visit the HSDB record page.


Phenacetin has known human metabolites that include N-Hydroxyphenacetin and acetaminophen.

S73 | METXBIODB | Metabolite Reaction Database from BioTransformer | DOI:10.5281/zenodo.4056560


5.6 Biological Half-Life

The elimination half-life (t1/2)beta varied from 37 to 74 minutes.

PMID:1233222 Raaflaub J et al; Eur J Clin Pharmacol 8 (3-4): 261-5 (1975)


5.7 Mechanism of Action

The present study was aimed to test the possible cyclooxygenase (COX)-1/COX-2 selectivity of the old analgesic drug phenacetin and its metabolite p-phenetidine, which exhibits high renal toxicity. Paracetamol (acetaminophen), the main metabolite of phenacetin with low renal toxicity, and indomethacin were selected as reference compounds. Collagen-stimulated platelet thromboxane B2 (TxB2) production and phorbol 12-myristate-13-acetate (PMA)-induced neutrophil prostaglandin E2 (PGE2) synthesis were used as indicators for COX-1 and COX-2 activity, respectively. Phenacetin was even less potent than paracetamol to reduce the production of both TxB2 and PGE2, and no clear preference for either of the COX-enzymes was seen. P-phenetidine was a more potent inhibitor, already at nanomolar level, of the synthesis of these prostanoids than indomethacin and showed some preference to COX-2 inhibition. Somewhat higher, micromolar, concentrations of p-phenetidine also reduced COX-2 expression in neutrophils. We suggest that the very potent inhibitory activity of p-phenetidine on PGE2 synthesis combined with the reduction of COX-2 expression could explain the renal papillary necrosis in phenacetin kidney.

PMID:14592552 Kankuri E et al; Thromb Res 110 (5-6): 299-303 (2003)


Analgesic nephropathy is a unique drug-induced kidney disease characterized pathologically by renal papillary necrosis and chronic interstitial nephritis, and is the result of excessive consumption of combination antipyretic analgesics. The clinical features of the disorder relate mainly to the papillary necrosis, renal colic, and obstructive uropathy and the development of chronic renal failure in a small percentage of patients. There are significant geographic variations in the clinical features that may be related to the differing combinations of analgesics. The pathogenesis of the disease is in part related to the kidneys' ability to concentrate drugs in the papillae. The following sequence of events presents a plausible explanation for the evolution of the disease. If a combination of phenacetin and aspirin is ingested, the following steps occur. Phenacetin is converted in the gut and liver to acetaminophen by first-pass metabolism. Acetaminophen is then taken up by the kidney and excreted. During its excretion, acetaminophen becomes concentrated in the papillae of the kidney during physiologic degrees of antidiuresis, the concentration being up to five times the intracellular concentration of other tissues. Acetaminophen undergoes oxidative metabolism by prostaglandin H synthase to a reactive quinoneimine that is conjugated to glutathione. If acetaminophen is present alone, there is sufficient glutathione generated in the papillae to detoxify the reactive intermediate. If the acetaminophen is ingested with aspirin, the aspirin is converted to salicylate and salicylate becomes highly concentrated in both the cortex and papillae of the kidney. Salicylate is a potent depletor of glutathione. The mechanism is not completely understood; however, the inhibition of the production of NADPH via the pentose shunt is a possible explanation. With the cellular glutathione depleted, the reactive metabolite of acetaminophen then produces lipid peroxides and arylation of tissue proteins, ultimately resulting in necrosis of the papillae.

PMID:8669429 Duggin G; Am J Kidney Dis 28 (1 Suppl 1): S39-47 (1996)


The mechanism of analgesic action has not been fully determined. Acetaminophen may act predominantly by inhibiting prostaglandin synthesis in the central nervous system (CNS) and, to a lesser extent, through peripheral action by blocking pain impulse generation. The peripheral action may also be due to inhibition of of the synthesis or actions of other substances that sensitive pain receptors to mechanical or chemical stimulation. /Acetaminophen/

Thomson/Micromedex. Drug Information for the Health Care Professional. Volume 1, Greenwood Village, CO. 2007., p. 16


Acetaminophen probably produces antipyresis by acting centrally on the hypothalamic heat-regulating center to produce peripheral vasodilation resulting in increased blood flow through the skin, sweating, and heat loss. The central action probably involves inhibition of prostaglandin synthesis in the hypothalamus. /Acetaminophen/

Thomson/Micromedex. Drug Information for the Health Care Professional. Volume 1, Greenwood Village, CO. 2007., p. 16


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