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Chemistry

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Also known as: Trental, 6493-05-6, Oxpentifylline, Pentoxifyllin, Torental, Pentoxyphylline
Molecular Formula
C13H18N4O3
Molecular Weight
278.31  g/mol
InChI Key
BYPFEZZEUUWMEJ-UHFFFAOYSA-N
FDA UNII
SD6QCT3TSU

Pentoxifylline
A METHYLXANTHINE derivative that inhibits phosphodiesterase and affects blood rheology. It improves blood flow by increasing erythrocyte and leukocyte flexibility. It also inhibits platelet aggregation. Pentoxifylline modulates immunologic activity by stimulating cytokine production.
Pentoxifylline is a Blood Viscosity Reducer. The physiologic effect of pentoxifylline is by means of Hematologic Activity Alteration.
1 2D Structure

Pentoxifylline

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
3,7-dimethyl-1-(5-oxohexyl)purine-2,6-dione
2.1.2 InChI
InChI=1S/C13H18N4O3/c1-9(18)6-4-5-7-17-12(19)10-11(14-8-15(10)2)16(3)13(17)20/h8H,4-7H2,1-3H3
2.1.3 InChI Key
BYPFEZZEUUWMEJ-UHFFFAOYSA-N
2.1.4 Canonical SMILES
CC(=O)CCCCN1C(=O)C2=C(N=CN2C)N(C1=O)C
2.2 Other Identifiers
2.2.1 UNII
SD6QCT3TSU
2.3 Synonyms
2.3.1 MeSH Synonyms

1. Agapurin

2. Bl 191

3. Bl-191

4. Bl191

5. Oxpentifylline

6. Pentoxil

7. Torental

8. Trental

2.3.2 Depositor-Supplied Synonyms

1. Trental

2. 6493-05-6

3. Oxpentifylline

4. Pentoxifyllin

5. Torental

6. Pentoxyphylline

7. Dimethyloxohexylxanthine

8. Pentoxiphyllium

9. Vazofirin

10. 3,7-dimethyl-1-(5-oxohexyl)xanthine

11. Pentoxiphyllin

12. Pentoxiphylline

13. Rentylin

14. 1-(5-oxohexyl)theobromine

15. Bl 191

16. Bl-191

17. 1h-purine-2,6-dione, 3,7-dihydro-3,7-dimethyl-1-(5-oxohexyl)-

18. 3,7-dimethyl-1-(5-oxohexyl)purine-2,6-dione

19. Pentoxyphyllin

20. 3,7-dihydro-3,7-dimethyl-1-(5-oxohexyl)-1h-purine-2,6-dione

21. 3,7-dimethyl-1-(5-oxohexyl)-3,7-dihydro-1h-purine-2,6-dione

22. Oxypentifylline

23. Pentoxyfilline

24. 1-(5-oxohexyl)-3,7-dimethylxanthine

25. Theobromine, 1-(5-oxohexyl)-

26. C04ad03

27. Sd6qct3tsu

28. 3,7-dimethyl-1-(5-oxohexyl)-1h-purine-2,6(3h,7h)-dione

29. Nsc637086

30. Chembl628

31. Nsc 637086

32. Nsc-637086

33. Nsc-758481

34. 3,7-dimethyl-1-(5-oxohexyl)-1h,3h-purin-2,6-dione

35. Mls000079026

36. Chebi:7986

37. Pentoxyfylline

38. Azupentat

39. 1,2,3,6-tetrahydro-3,7-dimethyl-1-(5-oxohexyl)-2,6-purindion

40. 3,7-dimethyl-1-(5-oxohexyl)-2,3,6,7-tetrahydro-1h-purine-2,6-dione

41. Eht 0202

42. Ncgc00015801-02

43. Durapental

44. Smr000035998

45. Dsstox_cid_3437

46. Dsstox_rid_77028

47. Dsstox_gsid_23437

48. Pnx

49. Pentoxifyllinum

50. Pentoxifilina

51. Hemovas

52. Ralofect

53. Vasofirin

54. Ikomio

55. Agapurin Retard

56. Pentoxifilina [inn-spanish]

57. Pentoxifyllinum [inn-latin]

58. Pentoxil (tn)

59. Trental (tn)

60. Cas-6493-05-6

61. Eht0201

62. Sr-01000075641

63. Mfcd00063379

64. 3,7-dimethyl-1-(5-oxohexyl)xantine

65. 3,7-dimethyl-1-(5-oxohexyl) Xantine

66. Pentoxyifylline

67. Pentopak

68. Ccris 6832

69. Pentoxifylline (jan/usp/inn)

70. 3arr

71. 3aru

72. 3tvx

73. Eht-201

74. Ptx;oxpentifylline

75. Eht-0201

76. Prestwick_608

77. Einecs 229-374-5

78. Pentoxifylline,(s)

79. Brn 0558929

80. Spectrum_001444

81. 2a3c

82. Unii-sd6qct3tsu

83. Opera_id_1800

84. Prestwick0_000196

85. Prestwick1_000196

86. Prestwick2_000196

87. Prestwick3_000196

88. Spectrum2_001181

89. Spectrum3_001820

90. Spectrum4_000227

91. Spectrum5_001161

92. Lopac-p-1784

93. P 1784

94. Pentoxifylline [mi]

95. Pentoxifylline [inn]

96. Pentoxifylline [jan]

97. Lopac0_000936

98. Schembl34039

99. Bspbio_000151

100. Bspbio_003439

101. Kbiogr_000893

102. Kbioss_001924

103. Pentoxifylline [usan]

104. Mls000758298

105. Mls001201764

106. Mls001424051

107. Bidd:gt0174

108. Divk1c_000729

109. Pentoxifylline [vandf]

110. Spectrum1503611

111. Spbio_001221

112. Spbio_002072

113. Pentoxifylline [mart.]

114. Bpbio1_000167

115. Gtpl7095

116. 1-(3-carboxypropyl)-3,7-

117. Pentoxifylline [usp-rs]

118. Pentoxifylline [who-dd]

119. Dtxsid7023437

120. Bdbm10850

121. Hms502e11

122. Kbio1_000729

123. Kbio2_001924

124. Kbio2_004492

125. Kbio2_007060

126. Kbio3_002942

127. Ninds_000729

128. Hms1568h13

129. Hms1922e16

130. Hms2051n06

131. Hms2090h13

132. Hms2093g21

133. Hms2095h13

134. Hms2235c16

135. Hms3262l14

136. Hms3370d09

137. Hms3393n06

138. Hms3712h13

139. Pharmakon1600-01503611

140. Bcp29306

141. Hy-b0715

142. Zinc1530776

143. Pentoxifylline [orange Book]

144. Tox21_110223

145. Tox21_500936

146. Bbl016497

147. Ccg-36382

148. Nsc758481

149. Pdsp1_001015

150. Pdsp2_000999

151. Pentoxifylline [ep Monograph]

152. Stk177321

153. Pentoxifylline [usp Monograph]

154. Akos000541484

155. Tox21_110223_1

156. Ac-8381

157. Db00806

158. Lp00936

159. Nc00255

160. Sdccgsbi-0050910.p004

161. 3,7-dimethyl-1-(5-oxohexyl)-xanthine

162. Cas-1677687

163. Idi1_000729

164. Ncgc00015801-01

165. Ncgc00015801-03

166. Ncgc00015801-04

167. Ncgc00015801-05

168. Ncgc00015801-06

169. Ncgc00015801-07

170. Ncgc00015801-08

171. Ncgc00015801-09

172. Ncgc00015801-10

173. Ncgc00015801-12

174. Ncgc00015801-17

175. Ncgc00015801-21

176. Ncgc00067069-02

177. Ncgc00067069-03

178. Ncgc00067069-04

179. Ncgc00067069-05

180. Ncgc00178062-01

181. Ncgc00178062-02

182. Ncgc00261621-01

183. As-13662

184. Pentoxifylline [usan:usp:inn:ban:jan]

185. Sbi-0050910.p003

186. 1-(5-oxohexyl)theobromine (pentoxifylline)

187. Ab00052363

188. Eu-0100936

189. Ft-0603570

190. Ft-0657886

191. Ft-0673610

192. P2050

193. S4345

194. Sw196777-4

195. C07424

196. D00501

197. D70138

198. Ab00052363-17

199. Ab00052363_18

200. Ab00052363_21

201. 5-26-14-00081 (beilstein Handbook Reference)

202. Q416331

203. 3,7-dimethyl-1-(5-oxohexyl)-1h-purine-2,6-dione

204. Ptx; Oxpentifylline; Bl191; Bl 191; Bl-191

205. Sr-01000075641-1

206. Sr-01000075641-4

207. Sr-01000075641-7

208. Sr-01000075641-9

209. Brd-k57569181-001-05-1

210. Brd-k57569181-001-16-8

211. 3,7-dimethyl-1-(5-oxohexyl)-3,7-dihydropurine-2,6-dione

212. 3,7-dimethyl-1-(5-oxohexyl)-3,7-dihydro-1h-purine-2,6-dione #

213. Px

2.4 Create Date
2005-03-25
3 Chemical and Physical Properties
Molecular Weight 278.31 g/mol
Molecular Formula C13H18N4O3
XLogP30.3
Hydrogen Bond Donor Count0
Hydrogen Bond Acceptor Count4
Rotatable Bond Count5
Exact Mass278.13789045 g/mol
Monoisotopic Mass278.13789045 g/mol
Topological Polar Surface Area75.5 Ų
Heavy Atom Count20
Formal Charge0
Complexity426
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 Drug Information
1 of 4  
Drug NamePentoxifylline
PubMed HealthPentoxifylline (By mouth)
Drug ClassesHemorheologic
Drug LabelEach extended-release tablet, for oral administration, contains 400 mg of pentoxifylline and the following inactive ingredients: D&C Red #30 Aluminum Lake, FD&C Blue #2 Aluminum Lake, FD&C Yellow #6 Aluminum Lake, hydroxyethyl cellulose, hypro
Active IngredientPentoxifylline
Dosage FormTablet, extended release
RouteOral
Strength400mg
Market StatusPrescription
CompanyApotex; Valeant Bermuda; Pliva; Mylan; Impax Labs

2 of 4  
Drug NamePentoxil
Drug LabelPentoxil (Pentoxifylline Extended-release Tablets, USP) for oral administration contain 400 mg of the active drug and the following inactive ingredients: D&C Red No. 27 Aluminum Lake, FD&C Blue No. 1 Aluminum Lake, hypromellose USP, magnesium stea
Active IngredientPentoxifylline
Dosage FormTablet, extended release
RouteOral
Strength400mg
Market StatusPrescription
CompanyUpsher Smith

3 of 4  
Drug NamePentoxifylline
PubMed HealthPentoxifylline (By mouth)
Drug ClassesHemorheologic
Drug LabelEach extended-release tablet, for oral administration, contains 400 mg of pentoxifylline and the following inactive ingredients: D&C Red #30 Aluminum Lake, FD&C Blue #2 Aluminum Lake, FD&C Yellow #6 Aluminum Lake, hydroxyethyl cellulose, hypro
Active IngredientPentoxifylline
Dosage FormTablet, extended release
RouteOral
Strength400mg
Market StatusPrescription
CompanyApotex; Valeant Bermuda; Pliva; Mylan; Impax Labs

4 of 4  
Drug NamePentoxil
Drug LabelPentoxil (Pentoxifylline Extended-release Tablets, USP) for oral administration contain 400 mg of the active drug and the following inactive ingredients: D&C Red No. 27 Aluminum Lake, FD&C Blue No. 1 Aluminum Lake, hypromellose USP, magnesium stea
Active IngredientPentoxifylline
Dosage FormTablet, extended release
RouteOral
Strength400mg
Market StatusPrescription
CompanyUpsher Smith

4.2 Drug Indication

Pentoxifylline is indicated for the treatment of intermittent claudication in patients with chronic occlusive arterial disease. Pentoxifylline may improve limb function and reduce symptoms but cannot replace other therapies such as surgical bypass or removal of vascular obstructions.


FDA Label


Investigated for use/treatment in alzheimer's disease and neurologic disorders.


5 Pharmacology and Biochemistry
5.1 Pharmacology

Pentoxifylline, a synthetic dimethylxanthine derivative structurally related to [theophylline] and [caffeine], exhibits hemorheological, anti-oxidative, and anti-inflammatory properties and is traditionally indicated in the treatment of peripheral arterial disease (PAD). In PAD patients with concurrent cerebrovascular and coronary artery diseases, pentoxifylline treatment has occasionally been associated with angina, arrhythmia, and hypotension. Concurrent use with [warfarin] should be associated with more frequent monitoring of prothrombin times. Also, patients with risk factors complicated by hemorrhages, such as retinal bleeding, peptic ulceration, and recent surgery, should be monitored periodically for bleeding signs.


5.2 MeSH Pharmacological Classification

Phosphodiesterase Inhibitors

Compounds which inhibit or antagonize the biosynthesis or actions of phosphodiesterases. (See all compounds classified as Phosphodiesterase Inhibitors.)


Platelet Aggregation Inhibitors

Drugs or agents which antagonize or impair any mechanism leading to blood platelet aggregation, whether during the phases of activation and shape change or following the dense-granule release reaction and stimulation of the prostaglandin-thromboxane system. (See all compounds classified as Platelet Aggregation Inhibitors.)


Free Radical Scavengers

Substances that eliminate free radicals. Among other effects, they protect PANCREATIC ISLETS against damage by CYTOKINES and prevent myocardial and pulmonary REPERFUSION INJURY. (See all compounds classified as Free Radical Scavengers.)


Vasodilator Agents

Drugs used to cause dilation of the blood vessels. (See all compounds classified as Vasodilator Agents.)


Radiation-Protective Agents

Drugs used to protect against ionizing radiation. They are usually of interest for use in radiation therapy but have been considered for other purposes, e.g. military. (See all compounds classified as Radiation-Protective Agents.)


5.3 FDA Pharmacological Classification
5.3.1 Active Moiety
PENTOXIFYLLINE
5.3.2 FDA UNII
SD6QCT3TSU
5.3.3 Pharmacological Classes
Hematologic Activity Alteration [PE]; Blood Viscosity Reducer [EPC]
5.4 ATC Code

C04AD03

S76 | LUXPHARMA | Pharmaceuticals Marketed in Luxembourg | Pharmaceuticals marketed in Luxembourg, as published by d'Gesondheetskeess (CNS, la caisse nationale de sante, www.cns.lu), mapped by name to structures using CompTox by R. Singh et al. (in prep.). List downloaded from https://cns.public.lu/en/legislations/textes-coordonnes/liste-med-comm.html. Dataset DOI:10.5281/zenodo.4587355


C - Cardiovascular system

C04 - Peripheral vasodilators

C04A - Peripheral vasodilators

C04AD - Purine derivatives

C04AD03 - Pentoxifylline


5.5 Absorption, Distribution and Excretion

Absorption

Oral pentoxifylline (PTX) is almost completely absorbed but has low bioavailability of 20-30% due to extensive first-pass metabolism; three of the seven known metabolites, M1, M4, and M5 are present in plasma and appear soon after dosing. Single oral doses of 100, 200, and 400 mg of pentoxifylline in healthy males produced a mean tmax of 0.29-0.41 h, a mean Cmax of 272-1607 ng/mL, and a mean AUC0- of 193-1229 ng\*h/mL; corresponding ranges for metabolites 1, 4, and 5 were 0.72-1.15, 114-2753, and 189-7057. Single administration of a 400 mg extended-release tablet resulted in a heightened tmax of 2.08 1.16 h, lowered Cmax of 55.33 22.04 ng/mL, and a comparable AUC0-t of 516 165 ng\*h/mL; all these parameters were increased in cirrhotic patients. Smoking was associated with a decrease in the Cmax and AUCsteady-state of metabolite M1 but did not dramatically affect the pharmacokinetic parameters of pentoxifylline or other measured metabolites. Renal impairment increases the mean Cmax, AUC, and ratio to parent compound AUC of metabolites M4 and M5, but has no significant effect on PTX or M1 pharmacokinetics. Finally, similar to cirrhotic patients, the Cmax and tmax of PTX and its metabolites are increased in patients with varying degrees of chronic heart failure. Overall, metabolites M1 and M5 exhibit plasma concentrations roughly five and eight times greater than PTX, respectively. PTX and M1 pharmacokinetics are approximately dose-dependent, while those of M5 are not. Food intake before PTX ingestion delays time to peak plasma concentrations but not overall absorption. Extended-release forms of PTX extend the tmax to between two and four hours but also serves to ameliorate peaks and troughs in plasma concentration over time.


Route of Elimination

Pentoxifylline is eliminated almost entirely in the urine and predominantly as M5, which accounts for between 57 and 65 percent of the administered dose. Smaller amounts of M4 are recovered, while M1 and the parent compound account for less than 1% of the recovered dose. The fecal route accounts for less than 4% of the administered dose.


Volume of Distribution

Pentoxifylline has a volume of distribution of 4.15 0.85 following a single intravenous 100 mg dose in healthy subjects.


Clearance

Pentoxifylline given as a single 100 mg intravenous infusion has a clearance of 3.62 0.75 L/h/kg in healthy subjects, which decreased to 1.44 0.46 L/h/kg in cirrhotic patients. In another study, the apparent clearance of either 300 or 600 mg of pentoxifylline given intravenously (median and range) was 4.2 (2.8-6.3) and 4.1 (2.3-4.6) L/min, respectively. It is important to note that, due to the reversible extra-hepatic metabolism of the parent compound and metabolite 1, the true clearance of pentoxifylline may be even higher than the measured values.


5.6 Metabolism/Metabolites

Pentoxifylline (PTX) metabolism is incompletely understood. There are seven known metabolites (M1 through M7), although only M1, M4, and M5 are detected in plasma at appreciable levels, following the general pattern M5 > M1 > PTX > M4. As PTX apparent clearance is higher than hepatic blood flow and the AUC ratio of M1 to PTX is not appreciably different in cirrhot