Phenacetin

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Phenacetin
Phenacetin.svg
Systematic (IUPAC) name
N-(4-Ethoxyphenyl)acetamide
Clinical data
Pregnancy cat.
  • unknown
Legal status
  • unknown
Routes unknown
Pharmacokinetic data
Bioavailability unknown
Protein binding unknown
Metabolism unknown
Half-life unknown
Identifiers
CAS number 62-44-2 YesY
ATC code N02BE03
PubChem CID 4754
DrugBank DB03783
ChemSpider 4590 YesY
UNII ER0CTH01H9 YesY
KEGG D00569 YesY
ChEBI CHEBI:8050 YesY
ChEMBL CHEMBL16073 YesY
Chemical data
Formula C10H13NO2 
Mol. mass 179.216 g/mol
Physical data
Density 1.24 g/cm³
Melt. point 134 °C (273 °F) (decomposes)
 YesY (what is this?)  (verify)

Phenacetin is a pain-relieving and fever-reducing drug, widely used from its introduction in 1887 until banned in the US by the FDA in 1983. Its use has declined because of its adverse effects, which include increased risk of certain cancers and kidney damage. It is metabolized into paracetamol, which replaced it in some over-the-counter medications following the ban on phenacetin.

History[edit]

Phenacetin was introduced in 1887, and was used principally as an analgesic; it was one of the first synthetic fever reducers to go on the market. It is also known historically to be one of the first non-opioid analgesics without anti-inflammatory properties.

Known mechanism of action[edit]

Its analgesic effects are due to its actions on the sensory tracts of the spinal cord. In addition, phenacetin has a depressant action on the heart, where it acts as a negative inotrope. It is an antipyretic, acting on the brain to decrease the temperature set point. It is also used to treat rheumatoid arthritis (subacute type) and intercostal neuralgia.

It is metabolised in the body to paracetamol.

Preparation[edit]

The first synthesis was reported in 1878 by Harmon Northrop Morse.[1]

Phenacetin may be synthesized as an example of the Williamson ether synthesis: ethyl iodide, paracetamol, and anhydrous potassium carbonate are refluxed in 2-butanone to give the crude product, which is recrystallized from water.[2]

Phenacetin from paracetamol.png

Uses[edit]

Vicks cold tablets, containing: Salicylamide, phenacetin 2 1/2 grs., Pyrilamine Maleate, Caffeine, Ephedrine Sulphate, Magnesium Hydroxide, Aluminum Hydroxide Complex (U.S. Pat. 2,446,981). That patent number is from 1948; these tablets would have been made shortly thereafter.

Phenacetin was widely used until the third quarter of the twentieth century, often in the form of an "A.P.C." or aspirin-phenacetin-caffeine compound analgesic, as a remedy for fever and pain. An early formulation (1919) was Vincent's APC in Australia. However the U.S. Food and Drug Administration ordered the withdrawal of drugs containing phenacetin in November 1983, owing to its carcinogenic and kidney-damaging properties (Federal Register of October 5, 1983 (48 FR 45466)). It was also banned in India.[3] As a result some branded, previously phenacetin-based preparations continued to be sold, but with the phenacetin replaced by safer alternatives. A popular brand of phenacetin was Roche's Saridon, which was reformulated in 1983 to contain propyphenazone, paracetamol and caffeine. Coricidin was also reformulated without phenacetin. Paracetamol is a metabolite of phenacetin with similar analgesic and antipyretic effects, but the new formulation has not been found to have phenacetin's carcinogenicity.

Phenacetin is now being used as a cutting agent to adulterate cocaine in the UK and Canada, owing to the similar physical features of the two drugs.[4][5]

Safety[edit]

Phenacetin, and products containing phenacetin, have been shown in an animal model to have the side effect and after-effect of carcinogenesis. In humans, many case reports have implicated products containing phenacetin in urothelial neoplasms, especially urothelial carcinoma of the renal pelvis. In one prospective series, phenacetin was associated with an increased risk of death due to urologic or renal diseases, death due to cancers, and death due to cardiovascular diseases.[6] In addition, people with glucose-6-phosphate dehydrogenase deficiency may experience acute hemolysis, or dissolution of blood cells, while taking this drug. Acute hemolysis is possible in the case of patients who develop an IgM response to phenacetin leading to immune complexes that bind to erythrocytes in blood. The erythrocytes are then lysed when the complexes activate the complement system.

Chronic use of phenacetin is known to lead to analgesic nephropathy characterized by renal papillary necrosis.[7][8][9] This is a condition which results in destruction of some or all of the renal papillae in the kidneys.

One notable death that can possibly be attributed to the use of this drug was that of the aviation pioneer Howard Hughes. He had been using phenacetin extensively for the treatment of chronic pain; it was stated during his autopsy that phenacetin use may have been the cause of his kidney failure.[10]

Notes and references[edit]

  1. ^ H. N. Morse (1878). "Ueber eine neue Darstellungsmethode der Acetylamidophenole". Berichte der deutschen chemischen Gesellschaft 11 (1): 232–233. doi:10.1002/cber.18780110151. 
  2. ^ "Conversion of Acetaminophen into Phenacetin". Chemistry Department Master Experiment Archive. California State University Stanislaus. 
  3. ^ "Drugs banned in India". Central Drugs Standard Control Organization, Dte.GHS, Ministry of Health and Family Welfare, Government of India. Retrieved 2013-09-17. 
  4. ^ "Cancer chemical in street cocaine". BBC News. 23 November 2006. 
  5. ^ Luba, Frank (31 July 2014). "Used cocaine lately? It may have been mixed with a pig deworming chemical". Toronto Star. Retrieved 24 September 2014. 
  6. ^ Dubach U, Rosner B, Stürmer T (1991). "An epidemiologic study of abuse of analgesic drugs. Effects of phenacetin and salicylate on mortality and cardiovascular morbidity (1968 to 1987)". N Engl J Med 324 (3): 155–60. doi:10.1056/NEJM199101173240304. PMID 1984193. 
  7. ^ Cochran A, Lawson D, Linton A (1967). "Renal papillary necrosis following phenacetin excess". Scott Med J 12 (7): 246–50. PMID 6036245. 
  8. ^ Tan G, Rabbino M, Hopper J (1964). "Is Phenacetin a Nephrotoxin?: A Report on Twenty-three Users of the Drug". Calif Med 101 (2): 73–7. PMC 1515485. PMID 14180501. 
  9. ^ Brix A (2002). "Renal papillary necrosis". Toxicol Pathol 30 (6): 672–4. doi:10.1080/01926230290166760. PMID 12512867. 
  10. ^ Tennant, Forest. "Howard Hughes & Pseudoaddiction" Practical Pain Management (July/August 2007)

External links[edit]