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Pholcodine
Also known as: Homocodeine, Morpholinylethylmorphine, Folcodine, Glycodine, Neocodine, Weifacodine
Molecular Formula
C23H30N2O4
Molecular Weight
398.5  g/mol
InChI Key
GPFAJKDEDBRFOS-FKQDBXSBSA-N
FDA UNII
LPP64AWZ7L

Pholcodine formula is 3-o-morpholinoethylmorphine and it is classified as an antitussive which is defined as an opioid cough suppressant. It belongs to the opioid family of compounds and it is widely used. Pholcodine activity is the suppression of unproductive cough and it also has a mild sedative effect with little or no analgesic effects. Pholcodine is not prescribed in the United States where it is classed as a Schedule I drug. It is categorized as Class B drug in the UK and officially taken out of the shelves in 2008. Pholcodine is not approved in Canada.
1 2D Structure

Pholcodine

2 Identification
2.1 Computed Descriptors
2.1.1 IUPAC Name
(4R,4aR,7S,7aR,12bS)-3-methyl-9-(2-morpholin-4-ylethoxy)-2,4,4a,7,7a,13-hexahydro-1H-4,12-methanobenzofuro[3,2-e]isoquinolin-7-ol
2.1.2 InChI
InChI=1S/C23H30N2O4/c1-24-7-6-23-16-3-4-18(26)22(23)29-21-19(5-2-15(20(21)23)14-17(16)24)28-13-10-25-8-11-27-12-9-25/h2-5,16-18,22,26H,6-14H2,1H3/t16-,17+,18-,22-,23-/m0/s1
2.1.3 InChI Key
GPFAJKDEDBRFOS-FKQDBXSBSA-N
2.1.4 Canonical SMILES
CN1CCC23C4C1CC5=C2C(=C(C=C5)OCCN6CCOCC6)OC3C(C=C4)O
2.1.5 Isomeric SMILES
CN1CC[C@]23[C@@H]4[C@H]1CC5=C2C(=C(C=C5)OCCN6CCOCC6)O[C@H]3[C@H](C=C4)O
2.2 Other Identifiers
2.2.1 UNII
LPP64AWZ7L
2.3 Synonyms
2.3.1 MeSH Synonyms

1. 7,8-didehydro-4,5 Alpha-epoxy-17-methyl-3-(2-morpholinoethoxymorphinan-6 Alpha-ol)

2. Homocodeine

2.3.2 Depositor-Supplied Synonyms

1. Homocodeine

2. Morpholinylethylmorphine

3. Folcodine

4. Glycodine

5. Neocodine

6. Weifacodine

7. Codylin

8. Pholtex

9. Hibernyl

10. Tussokon

11. Ethnine

12. Memine

13. Pholcodinum

14. Folcodina

15. Galenphol

16. 509-67-1

17. Biocalyptol

18. Pectolin

19. 3-morpholylaethylmorphin

20. Beta-morpholinoethylmorphine

21. Folkodin

22. Neocodin

23. Pholcodin

24. Ethnine Simplex

25. Dia-tuss

26. 3-(2-(4-morpholinyl)ethyl)morphine

27. Tetrahydro-1,4-oxazinylmethylcodeine

28. Galphol

29. 3-(2-morpholinoethyl)morphine

30. Dea No. 9314

31. Chebi:53579

32. 3-morpholinoethylmorphine

33. Lpp64awz7l

34. 7,8-didehydro-4,5-alpha-epoxy-17-methyl-3-(2-morpholinoethoxy)morphinan-6-alpha-ol

35. Pholcodine (inn)

36. Pholcodine [inn]

37. (5alpha,6alpha)-17-methyl-3-[2-(morpholin-4-yl)ethoxy]-7,8-didehydro-4,5-epoxymorphinan-6-ol

38. Prodromine

39. O3-(2-morpholinoethyl)morphine

40. Morphine, 3-o-(2-morpholinoethyl)-

41. Folkodin [czech]

42. (4r,4ar,7s,7ar,12bs)-3-methyl-9-(2-morpholin-4-ylethoxy)-2,4,4a,7,7a,13-hexahydro-1h-4,12-methanobenzofuro[3,2-e]isoquinolin-7-ol

43. Folcodina [spanish]

44. Pholcodinum [latin]

45. Pholcodine [inn:ban]

46. Folcodina [inn-spanish]

47. Pholcodinum [inn-latin]

48. Unii-lpp64awz7l

49. Beta-morpholinylethylmorphine

50. Adaphol

51. Codisol

52. Copholco

53. Lantuss

54. Pholcolin

55. Pavacol-d

56. 3-morpholylaethylmorphin [german]

57. Covonia Dry Cough

58. Einecs 208-102-9

59. O(sup 3)-(2-morpholinoethyl)morphine

60. 3-morpholylathylmorphin

61. Pholcodine [mi]

62. Morphine, O(sup 3)-(2-morpholinoethyl)-

63. Pholcodine Linctus (tn)

64. Epitope Id:116651

65. Pholcodine [who-dd]

66. Schembl154354

67. Gtpl9086

68. Chembl2105224

69. Dtxsid70198923

70. 03-(2-morpholinoethyl)-morphine

71. Ids-np-011(sect.2)

72. 3-o-(2-morpholinoethyl)-morphine

73. Morphinan-6-ol, 7,8-didehydro-4,5-epoxy-17-methyl-3-(2-(4-morpholinyl)ethoxy)-, (5.alpha.,6.alpha.)-

74. Zinc4217287

75. Db09209

76. D07385

77. Q3124290

78. Morphinan-6-alpha-ol, 7,8-didehydro-4,5-alpha-epoxy-17-methyl-3-(2-morpholinoethoxy)-

79. (1s,5r,13r,14s,17r)-4-methyl-10-[2-(morpholin-4-yl)ethoxy]-12-oxa-4-azapentacyclo[9.6.1.0^{1,13}.0^{5,17}.0^{7,18}]octadeca-7(18),8,10,15-tetraen-14-ol

80. (4r,4ar,7s,7ar,12bs)-3-methyl-9-(2-morpholin-4-ylethoxy)-2,4,4a,7,7a,13-hexahydro-1h-4,12-methanobenzofuro[3,2-e]isoquinoline-7-o

2.4 Create Date
2005-08-09
3 Chemical and Physical Properties
Molecular Weight 398.5 g/mol
Molecular Formula C23H30N2O4
XLogP30.8
Hydrogen Bond Donor Count1
Hydrogen Bond Acceptor Count6
Rotatable Bond Count4
Exact Mass398.22055744 g/mol
Monoisotopic Mass398.22055744 g/mol
Topological Polar Surface Area54.4 Ų
Heavy Atom Count29
Formal Charge0
Complexity653
Isotope Atom Count0
Defined Atom Stereocenter Count5
Undefined Atom Stereocenter Count0
Defined Bond Stereocenter Count0
Undefined Bond Stereocenter Count0
Covalently Bonded Unit Count1
4 Drug and Medication Information
4.1 Drug Indication

Pholcodine is indicated as a cough suppressant for the temporary relief of non-productive dry cough. It is stated to present a required label indication of "temporary relief of dry cough." Cough is the respiratory movement that occurs after an irritation signal is transmitted to the central nervous system and further stimulates the medulla oblongata. This stimulation causes a motor output that is sent through motoneurons to the respiratory muscles. A non-productive cough is a type of cough characterized by the absence of sputum, and it has a large inspiration that will cause continuous coughing.


5 Pharmacology and Biochemistry
5.1 Pharmacology

The therapeutic doses of pholcodine have been shown not to cause depression of respiration, CNS excitation or other side effects associated with narcotics. It is thought that the impact of pholcodine is selective on the cough center without affecting the respiratory center. Pholcodine is not euphorigenic, and thus, psychological dependence is unlikely. Clinical trials have not shown any evidence of addiction after prolonged administration of pholcodine. It is well reported that pholcodine presents a more considerable respiratory depression effect than codeine and it causes hypotension in the same degree than codeine. Some other noted impacts of pholcodine in preclinical trials are: 1) the induction of histamine release, 2) anti-histaminic effect, 3) anti-acetylcholinic action, 4) anti-convulsant action and 5) mild tranquilizing action.


5.2 MeSH Pharmacological Classification

Analgesics

Compounds capable of relieving pain without the loss of CONSCIOUSNESS. (See all compounds classified as Analgesics.)


Antitussive Agents

Agents that suppress cough. They act centrally on the medullary cough center. EXPECTORANTS, also used in the treatment of cough, act locally. (See all compounds classified as Antitussive Agents.)


5.3 ATC Code

R - Respiratory system

R05 - Cough and cold preparations

R05D - Cough suppressants, excl. combinations with expectorants

R05DA - Opium alkaloids and derivatives

R05DA08 - Pholcodine


5.4 Absorption, Distribution and Excretion

Absorption

After oral administration of 60 mg of pholcodine, the Tmax and Cmax are reported to be 1.3 hours and 26.3 ng/ml. In the same administration, the AUC in plasma and saliva are reported to be 1.67 and 6.61 mg h/l respectively. The absorption of pholcodine is reported to represent approximately 88% of the administered dose.


Route of Elimination

After oral administration of pholcodine, the serum concentration peaks and declines in a monoexponential manner. The percent of the dose excreted unchanged is of approximately 25-30%. Part of the administered dose is composed by metabolites that can be recovered in urine. From the administered dose, the fecal excretion corresponds to the 5% of the administered dose as unchanged pholcodine.


Volume of Distribution

The reported volume of distribution depends on the pharmacokinetic model and it can be of 265L based on a one-compartment model to 3207L in a two-compartment model.


Clearance

After oral administration of 60 mg of pholcodine, the clearance rate was reported to be 126 ml/min.


5.5 Metabolism/Metabolites

The metabolism of pholcodine seems to be very slow and due to the elimination profile, it is thought that most of the administered dose undergoes metabolism. There is some evidence in preclinical trials that indicate that morphine is a minor metabolite of pholcodine and that it accounts for 1% of the administered dose.


5.6 Biological Half-Life

After oral administration of 60 mg of pholcodine, the half-life in plasma, saliva and urine are 45, 55 and 45 hours respectively.


5.7 Mechanism of Action

The mechanism of action of pholcodine is directly performed in the medulla oblongata. In this site, it exerts analgesic properties on the peripheric reflexogenic receptors. This site is commonly known as the "cough center."


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