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Fentanyl
File:Fentanyl.svg
File:Fentanyl-xtal-3D-balls.png
Systematic (IUPAC) name
N-(1-(2-phenylethyl)-4-piperidinyl)-N-phenylpropanamide
Clinical data
Pregnancy
category
  • US: C (Risk not ruled out)
Dependence
liability		 Moderate - High
Routes of
administration		 TD, IM, IV, oral, sublingual, buccal
Legal status
Legal status
Pharmacokinetic data
Bioavailability 92% (transdermal)
89% (intranasal)
50% (buccal)
33% (ingestion)
Protein binding 80-85%
Metabolism hepatic, primarily by CYP3A4
Biological half-life (IV)= 2.5 minutes
Intranasal = 6.5 mins
Transdermal = 7 hours (range 3–12 h)
Excretion 60% Urinary (metabolites, <10% unchanged drug)[1]
Identifiers
CAS Number 437-38-7
ATC code N01AH01 (WHO) N02AB03
PubChem CID 3345
IUPHAR/BPS 1626
DrugBank DB00813
ChemSpider 3228
Chemical data
Formula C22H28N2O
Molar mass 336.471 g/mol[[Script error: No such module "String".]]
Script error: No such module "collapsible list".
Physical data
Melting point 87.5 °C (189.5 °F)
  (verify)
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Fentanyl (also known as fentanil, brand names Sublimaze,[2] Actiq, Durogesic, Duragesic, Fentora, Onsolis,[3] Instanyl,[4] and others) is a potent narcotic analgesic with a rapid onset and short duration of action.[5] In addition, it is a synthetic strong agonist at the μ-opioid receptors. Historically it has been used to treat chronic breakthrough pain and is commonly used pre-procedures.

Fentanyl is approximately 100 times more potent than morphine,[6] with 100 micrograms of Fentanyl approximately equivalent to 10 mg of morphine and 75 mg of pethidine (meperidine) in analgesic activity.[6] It has an LD50 of 3.1 milligrams per kilogram in rats, 0.03 milligrams per kilogram in monkeys, and an undetermined LD50 in humans.

Fentanyl was first synthesized by Dr. Paul Janssen in 1960[7] following the medical inception of pethidine several years earlier. Janssen developed fentanyl by assaying analogues of the structurally-related drug pethidine for opioid activity.[8] The widespread use of fentanyl triggered the production of fentanyl citrate (fentanyl combined with citrate at a 1:1 ratio),[9] which entered the clinical practice as a general anaesthetic under the trade name Sublimaze in the 1960s. Following this, many other fentanyl analogs were developed and introduced into the medical practice, including sufentanil, alfentanil, remifentanil, and lofentanil.

In the mid 1990s, fentanyl saw its first widespread palliative use with the clinical introduction of the Duragesic patch, followed in the next decade by the introduction of the first quick-acting prescription formations of fentanyl for personal use, the Actiq lollipop and Fentora buccal tablets. Through the delivery method of transdermal patches, fentanyl is currently the most widely used synthetic opioid in clinical practice, with several new delivery methods currently in development.[10]

History

Fentanyl was first synthesized by Paul Janssen under the label of his relatively newly formed Janssen Pharmaceutica in 1959. In the 1960s, fentanyl was introduced as an intravenous anesthetic under the trade name of Sublimaze. In the mid-1990s, Janssen Pharmaceutica developed and introduced into clinical trials the Duragesic patch, which is a formation of an inert alcohol gel infused with select fentanyl doses which are worn to provide constant administration of the opioid over a period of 48 to 72 hours. After a set of successful clinical trials, Duragesic fentanyl patches were introduced into the medical practice.

Following the patch, a flavored lollipop of fentanyl citrate mixed with inert fillers was introduced under the brand name of Actiq, becoming the first quick-acting formation of fentanyl for use with chronic breakthrough pain. More recently, fentanyl has been developed into an effervescent tab for buccal absorption much like the Actiq lollipop, followed by a buccal spray device for fast-acting relief and other delivery methods currently in development.

A new Fentanyl product has been approved by the FDA for breakthrough cancer pain called Onsolis. It uses a new drug delivery technology called BEMA (fentanyl buccal soluble film) which is placed in the mouth on a small disc. There appears to be less abuse potential because the drug can not be crushed up and snorted like other fentanyl products. It also has a lower incidence of mouth ulcers for patients using fentanyl for breakthrough cancer pain.[citation needed]

Mechanism of action

Fentanyl works on the receptors in the brain for opioids, creating a general sense of euphoria. The brain is protected by a special filter called the blood-brain barrier, but fentanyl is able to quickly cross from the blood into the brain. As a result, fentanyl begins to have its effect almost immediately after it enters the blood. The speed with which it enters the blood depends on the form of fentanyl that is administered.

Chemistry

Synthesis

The synthesis of fentanyl (N-phenyl-N-(1-phenethyl-4-piperidinyl)propanamide) by Janssen Pharmaceutica was achieved in four steps, starting from 4-piperidinone hydrochloride. The 4-piperidinone hydrochloride was first reacted with phenethyl bromide to give N-phenethyl-4-piperidinone (NPP). Treatment of the NPP intermediate with aniline followed by reduction with sodium borohydride affording 4-anilino-N-phenethyl-piperidine (ANPP). Finally ANPP and propionic anhydride are reacted to form the amide product.

Analogues

The pharmaceutical industry has developed several analogues of fentanyl:

  • Alfentanil (trade name Alfenta), an ultra-short acting (5–10 minutes) analgesic.
  • Sufentanil (trade name Sufenta), a potent analgesic (5 to 10 times more potent than fentanyl) for use in specific surgeries and surgery in heavily opioid-tolerant/opioid-dependent patients. Has a high enough binding affinity to theoretically break through a buprenorphine blockade to be able to offer pain relief from acute trauma in patients who are taking high-dose buprenorphine.
  • Remifentanil (trade name Ultiva), currently the shortest acting opioid, has the benefit of rapid offset, even after prolonged infusions.
  • Carfentanil (trade name Wildnil) is an analogue of fentanyl with an analgesic potency 10,000 times that of morphine and is used in veterinary practice to immobilize certain large animals such as elephants.
  • Lofentanil is an analogue of fentanyl, with a potency slightly greater than carfentanil.

A number of other fentanyl analogues exist which are classified in the USA as Schedule I drugs, meaning that they have "no currently accepted medical use".[11] Many of these drugs have been sold on the street as "China White".[12] These drugs include:

Therapeutic use

Intravenous fentanyl is extensively used for anesthesia and analgesia, most often in operating rooms and intensive care units. It is often administered in combination with a benzodiazepine, such as midazolam, to produce procedural sedation for endoscopy, cardiac catheterization, oral surgery, etc. Additionally, Fentanyl is often used in cancer therapy and other chronic pain management due to its effectiveness in relieving pain.
File:Fentanyl Transdermal System 50 mcg Patch.jpg
Fentanyl Transdermal System patch (50 µg/h).

Fentanyl transdermal patch (Durogesic/Duragesic/Matrifen) is used in chronic pain management. The patches work by releasing fentanyl into body fats, which then slowly release the drug into the bloodstream over 48 to 72 hours, allowing for long-lasting relief from pain. The patches are available in generic form and are available for lower costs. Fentanyl patches are manufactured in five patch sizes: 12.5 micrograms/hour, 25 µg/h, 50 µg/h, 75 µg/h, and 100 µg/h. Dosage is based on the size of the patch, since the transdermal absorption rate is generally constant at a constant skin temperature. Rate of absorption is dependent on a number of factors. Body temperature, skin type, amount of body fat, and placement of the patch can have major effects. The different delivery systems used by different makers will also affect individual rates of absorption. The typical patch will take effect under normal circumstances usually within 8–12 hours, thus fentanyl patches are often prescribed with another opiate (such as morphine sulfate or oxycodone hydrochloride) to handle breakthrough pain.

Fentanyl lozenges (Actiq) are a solid formulation of fentanyl citrate on a stick in the form of a lollipop that dissolves slowly in the mouth for transmucosal absorption. These lozenges are intended for opioid-tolerant individuals and are effective in treating breakthrough cancer pain. It is also useful for breakthrough pain for those suffering bone injuries, severe back pain, neuropathy, arthritis, and some other examples of chronic nonmalignant pain. The unit is a berry-flavored lozenge on a stick which is swabbed on the mucosal surfaces inside the mouth—inside of the cheeks, under and on the tongue and gums—to release the fentanyl quickly into the system. It is most effective when the lozenge is consumed in 15 minutes. The drug is less effective if swallowed, as despite good absorbance from the small intestine there is extensive first-pass metabolism, leading to an oral bioavailability of 33%. Fentanyl lozenges are available in six dosages, from 200 to 1600 µg in 200 µg increments (excluding 1000 µg and 1400 µg). These are now available in the United states in generic form,[13] through an FTC consent agreement.[14] However, most patients find it takes 10–15 minutes to use all of one lozenge, and those with a dry mouth cannot use this route. In addition, nurses are unable to document how much of a lozenge has been used by a patient, making drug records inaccurate.

Over 2008-09, a wide range of fentanyl preparations will become available, including buccal tablets or patches, nasal sprays, inhalers and active transdermal patches (heat or electrical). High-quality evidence for their superiority over existing preparations is currently lacking. Some preparations such as nasal sprays and inhalers may result in a rapid response, but the fast onset of high blood levels may compromise safety (see below). In addition, the expense of some of these appliances may greatly reduce their cost-effectiveness.

On July 16, 2009 the FDA approved Onsolis (BEMA Fentanyl) for breakthrough cancer pain. Onsolis incorporates "bioerodible mucoadhesive" technology, a small soluble film that contains Fentanyl which is placed on the inside cheek of the mouth.

In palliative care, transdermal fentanyl has a definite, but limited, role for:

  • Patients already stabilized on other opioids who have persistent swallowing problem and cannot tolerate other parenteral routes such as subcutaneous administration.
  • Patients with moderate to severe renal failure.
  • Troublesome adverse effects on morphine, hydromorphone or oxycodone.

Fentanyl is sometimes given intrathecally as part of spinal anesthesia or epidurally for epidural anesthesia and analgesia. Because of fentanyl's high lipid solubility, its effects are more localised than morphine and some clinicians prefer to use the morphine to get a wider spread of analgesia.

Adverse events

Fentanyl's major side effects (more than 10% of patients) include diarrhea, nausea, constipation, dry mouth, somnolence, confusion, asthenia (weakness), and sweating and, less frequently (3 to 10% of patients), abdominal pain, headache, fatigue, anorexia and weight loss, dizziness, nervousness, hallucinations, anxiety, depression, flu-like symptoms, dyspepsia (indigestion), dyspnea (shortness of breath), hypoventilation, apnea, and urinary retention. Fentanyl use has also been associated with aphasia.[15] Fentanyl patch has been associated with altered mental state leading to aggression in an anecdotal case report.[16]

Adverse effects

Like other lipid-soluble drugs, the pharmacodynamics of fentanyl are poorly understood. The manufacturers acknowledge there are no data on the pharmacodynamics of fentanyl in elderly, cachectic or debilitated patients, frequently the type of patient for which transdermal fentanyl is being used. This may explain the increasing number of reports of respiratory depression events since the late 1970s.[17][18][19][20][21][22][23] In 2006 the U.S. Food and Drug Administration started investigating several respiratory deaths, but doctors in the UK had to wait until September 2008 before being warned of the risks with fentanyl.[24]

The precise reason for sudden respiratory depression is unclear, but there are several hypotheses:

  • Saturation of the body fat compartment in patients with rapid and profound body fat loss (patients with cancer, cardiac or infection-induced cachexia can lose 80% of their body fat).
  • Early carbon dioxide retention causing cutaneous vasodilatation (releasing more fentanyl), together with acidosis which reduces protein binding of fentanyl (releasing yet more fentanyl).
  • Reduced sedation, losing a useful early warning sign of opioid toxicity, and resulting in levels closer to respiratory depressant levels.

Fentanyl has a therapeutic index of 270.[25]

Illicit use

File:Deafentanyl.jpg
Fentanyl powder seized by a Lake County Deputy Sheriff in Painesville, Ohio, where a male subject had been discovered unresponsive and struggling to breathe.[26]

Illicit use of pharmaceutical fentanyls first appeared in the mid-1970s in the medical community and continues in the present. United States authorities classify fentanyl as a narcotic. To date, over 12 different analogues of fentanyl have been produced clandestinely and identified in the U.S. drug traffic. The biological effects of the fentanyls are similar to those of heroin, with the exception that many users report a noticeably less euphoric 'high' associated with the drug and stronger sedative and analgesic effects.[citation needed]

The use of fentanyl has caused death. Because the effects of fentanyl last for only a very short time, it is even more addictive than heroin, and regular users may become addicted very quickly.[citation needed] Additionally, fentanyl may be hundreds of times more potent than street heroin, and tends to produce significantly worse respiratory depression, making it somewhat more dangerous than heroin to users. Fentanyl is most commonly used orally, but like heroin, can also be smoked, snorted or injected. Fentanyl is sometimes sold as heroin, often leading to overdoses. Many fentanyl overdoses are initially classified as heroin overdoses.[27]

Fentanyl is normally sold on the black market in the form of transdermal fentanyl patches such as Duragesic, diverted from legitimate medical supplies. The patches may be cut up and eaten, or the gel from inside the patch smoked. To prevent the removal of the fentanyl base, Janssen-Cilag, the inventor of the Fentanyl patch, designed the Durogesic patch. The Durogesic patches contain their fentanyl throughout the plastic matrix instead of gel incorporated into a reservoir on the patch. Manufacturers such as Mylan have also produced Durogesic-style fentanyl patches that contain the chemical in a silicone matrix, preventing the removal of the fentanyl-containing gel present in other products.

The plastic matrix makes the patches far less suitable to transbuccal use and far more difficult to use illicitly than its gel filled counterpart.[28] Another dosage form of fentanyl that has appeared on the streets are the Actiq fentanyl lollipops, which are sold under the street name of "percopop". The pharmacy retail price ranges from US$10 to US$30 per unit (based on strength of lozenge), with the black market cost anywhere from US$15 to US$40 per unit, depending on the strength.

Non-medical use of fentanyl by individuals without opiate tolerance can be very dangerous and has resulted in numerous deaths.[29] Even those with opiate tolerances are at high risk for overdoses. Once the fentanyl is in the user's system it is extremely difficult to stop its course because of the nature of absorption. Illicitly synthesized fentanyl powder has also appeared on the US market. Because of the extremely high strength of pure fentanyl powder, it is very difficult to dilute appropriately, and often the resulting mixture may be far too strong and consequently very dangerous.

Some heroin dealers mix fentanyl powder with heroin in order to increase potency or compensate for low-quality heroin. In 2006, illegally manufactured, non-pharmaceutical fentanyl often mixed with cocaine or heroin caused an outbreak of overdose deaths in the United States, heavily concentrated in the cities of Chicago, Detroit, and Philadelphia.[30] Baltimore, Pittsburgh, St. Louis, Milwaukee, Camden, New Jersey,[31] Little Rock, and Dallas[32] were also affected. The mixture of fentanyl and heroin is known as "magic" or "the bomb", among other names, on the street.[33]

Several large quantities of illicitly produced fentanyl have been seized by U.S. law enforcement agencies. In June 2006, 945 grams of 83% pure fentanyl powder was seized by Border Patrol agents in California from a vehicle which had entered from Mexico.[34] Mexico is the source of much of the illicit fentanyl for sale in the U.S. However, there has been one domestic fentanyl lab discovered by law enforcement, in April 2006 in Azusa, California. The lab was a source of counterfeit 80-mg OxyContin tablets containing fentanyl instead of oxycodone, as well as bulk fentanyl and other drugs.[35][36]

The "China White" form of fentanyl refers to any of a number of clandestinely produced analogues, especially α-methylfentanyl (AMF),[37][38] which today are classified as Schedule I drugs in the United States.[12] Part of the motivation for AMF is that despite the extra difficulty from a synthetic standpoint, the resultant drug is relatively more resistant to metabolic degradation. This results in a drug with an increased duration.[39]

Military use

A derivative of fentanyl may have been used as the Moscow hostage crisis chemical agent.[40]

The Danish Army is also using the fentanyl stick in military operations used as a pain killer.[citation needed]

United States Air Force Pararescue uses lollipops with fentanyl.[41]

Overdoses, recalls, and legal action

A number of fatal fentanyl overdoses have been directly tied to the drug over the past several years. In particular, manufacturers of time-release fentanyl patches have come under scrutiny for defective products. While the fentanyl contained in the patches was safe, a malfunction of the patches caused an excessive amount of fentanyl to leak and to be absorbed by patients, resulting in life-threatening side effects and even death.[42][43]

Manufacturers of fentanyl transdermal pain patches have voluntarily recalled numerous lots of their patches, and the U.S. Food and Drug Administration (FDA) has issued Public Health Advisories related to the fentanyl patch dangers. Manufacturers affected include Janssen Pharmaceutica Products, L.P.; Alza Corporation; Actavis South Atlantic, LLC; Sandoz; and Cephalon, Inc.[44]

On 27 June 2005, Domino Harvey, a known bounty hunter also the daughter of Oscar nominated Lawrence Harvey, was found dead in a bathtub in West Hollywood after she became unresponsive while talking to Peter Dice, a "sobriety guardian." Domino had hired Dice to help control her drug use. On 3 September, the Los Angeles County coroner reported that a toxicological exam determined that Harvey died from an overdose of fentanyl, an extremely potent opiate painkiller. Her career as a bounty hunter has been portrayed in the movie Domino.

On May 24, 2009, Wilco's former guitarist Jay Bennett died in his sleep of an overdose of the drug via duragesic time-release patches, which he was prescribed.[45]

In 2010, Slipknot's bassist Paul Gray died after he was accidentally overdosed with the drug.[46]

References

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cs:Fentanyl de:Fentanyl es:Fentanilo eu:Fentaniloa fr:Fentanyl ko:펜타닐 it:Fentanyl hu:Fentanil nl:Fentanyl ja:フェンタニル pl:Fentanyl pt:Fentanil ro:Fentanil ru:Фентанил fi:Fentanyyli sv:Fentanyl th:เฟนทานิล

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  1. ↑ "Journal Article". SpringerLink. Retrieved 2010-07-28. 
  2. ↑ "Sublimaze Official FDA information, side effects and uses". Drugs.com. Retrieved 2010-07-28. 
  3. ↑ "Introducing Onsolis". Onsolis.com. Retrieved 2010-07-28. 
  4. ↑ "London, 23 April 2009" (PDF). Retrieved 2010-07-28. 
  5. ↑ "WCPI Focus on Pain Series: The Three Faces of Fentanyl". Aspi.wisc.edu. Retrieved 2010-07-28. 
  6. ↑ 6.0 6.1 "DBL® FENTANYL INJECTION". Medsafe. Retrieved 2010-07-28. 
  7. ↑ Stanley TH. (1992). "The history and development of the fentanyl series". J Pain Symptom Manage. 7 (3): S3–7. doi:10.1016/0885-3924(92)90047-L. PMID 1517629. 
  8. ↑ Sir James Black (2005). "A Personal Perspective on Dr. Paul Janssen" (PDF). J. Med. Chem. 48 (6): 1687–1688. doi:10.1021/jm040195b. PMID 15771410. Retrieved 2010-07-28. 
  9. ↑ "DailyMed: About DailyMed". Dailymed.nlm.nih.gov. Retrieved 2010-07-28. 
  10. ↑ "Long Term Safety and Efficacy Study of Fentanyl Sublingual Spray for the Treatment of Breakthrough Cancer Pain - Full Text View". ClinicalTrials.gov. Retrieved 2010-07-28. 
  11. ↑ 21 U.S.C. § 812(b)(1)(B) (2002).
  12. ↑ 12.0 12.1 12.2 List of Schedule I Drugs, U.S. Department of Justice.
  13. ↑ "Barr Launches Generic ACTIQ(R) Cancer Pain Management Product" (Press release). Barr Pharmaceuticals. 27 September 2006. http://www.lifesciencesworld.com/news/view/9520. Retrieved 30 September 2006. 
  14. ↑ "With Conditions, FTC Allows Cephalon’s Purchase of CIMA, Protecting Competition for Breakthrough Cancer Pain Drugs" (Press release). FTC. 9 August 2004. http://www.ftc.gov/opa/2004/08/cimacephalon.htm. Retrieved 30 September 2006. 
  15. ↑ "Fentanyl Transdermal Official FDA information, side effects and uses". Drugs.com. Retrieved 2010-07-28. 
  16. ↑ "European Psychiatry : Fentanyl patch and attempted murder: A case report". ScienceDirect. 2008-03-28. Retrieved 2010-07-28. 
  17. ↑ Smydo J. Delayed respiratory depression with fentanyl. Anesthesia Progress. 26(2):47-8, 1979
  18. ↑ van Leeuwen L. Deen L. Helmers JH. A comparison of alfentanil and fentanyl in short operations with special reference to their duration of action and postoperative respiratory depression. Anaesthesist. 30(8):397-9, 1981
  19. ↑ Brown DL. Postoperative analgesia following thoracotomy. Danger of delayed respiratory depression. Chest. 88(5):779-80, 1985.
  20. ↑ Bulow HH. Linnemann M. Berg H. Lang-Jensen T. LaCour S. Jonsson T. Respiratory changes during treatment of postoperative pain with high dose transdermal fentanyl. Acta Anaesthesiologica Scandinavica, 1995; 39(6): 835-9.
  21. ↑ Nilsson C. Rosberg B. Recurrence of respiratory depression following neurolept analgesia. Acta Anaesthesiologica Scandinavica. 26(3):240-1, 1982
  22. ↑ McLoughlin R. McQuillan R. Transdermal fentanyl and respiratory depression. Palliative Medicine, 1997; 11(5):419.
  23. ↑ Regnard C, Pelham A. Severe respiratory depression and sedation with transdermal fentanyl: four case studies. Palliative Medicine, 2003; 17: 714-716.
  24. ↑ Drug Safety Update, vol 2(2) September 2008 p2. Available online on http://www.mhra.gov.uk/Publications/Safetyguidance/DrugSafetyUpdate/CON025631
  25. ↑ Stanley, Theodore Henry; Petty, William Clayton (1983-03-31). New Anesthetic Agents, Devices, and Monitoring Techniques. Springer. ISBN 9789024727964. Retrieved 20 October 2007. 
  26. ↑ "DEA Microgram Bulletin, June 2006". US Drug Enforcement Administration, Office of Forensic Sciences Washington, D.C. 20537. June 2006. Retrieved 22 June 2009. 
  27. ↑ Boddiger, D. (2006, August 12). Fentanyl-laced street drugs “kill hundreds”. The Lancet. Retrieved June 15, 2010.
  28. ↑ "Declaration of Gordon Flynn, Ph.D." (pdf). 2004-12-22. Retrieved 2010-07-28. 
  29. ↑ http://www.deadiversion.usdoj.gov/drugs_concern/fentanyl.htm
  30. ↑ "CDC MMWR Nonpharmaceutical Fentanyl-Related Deaths - Multiple States, April 2005-March 2007". Cdc.gov. Retrieved 2010-07-28. 
  31. ↑ Press Release by the Chicago Police Department Police report about a death linked to heroin/fentanyl mixture August 24, 2006
  32. ↑ "SMU student's death blamed on rare drug". Dallasnews.com. 2006-12-20. Retrieved 2010-07-28. 
  33. ↑ Fentanyl probe nets 3 suspects by Norman Sinclair and Ronald J. Hansen, The Detroit News, June 23, 2006. Retrieved June 25, 2006.
  34. ↑ INTELLIGENCE ALERT: HIGH PURITY FENTANYL SEIZED NEAR WESTMORELAND, CALIFORNIA, DEA Microgram, June 2006
  35. ↑ INTELLIGENCE ALERT: LARGE FENTANYL / MDA / TMA LABORATORY IN AZUZA, CALIFORNIA - POSSIBLY THE “OC-80” TABLET SOURCE, DEA Microgram, April 2006.
  36. ↑ INTELLIGENCE ALERT: OXYCONTIN MIMIC TABLETS (CONTAINING FENTANYL) NEAR ATLANTIC, IOWA, DEA Microgram, January 2006.
  37. ↑ List of Schedule I Drugs, U.S. Department of Justice. This DOJ document lists "China White" as a synonym for a number of fentanyl analogues, including 3-methylfentanyl and α-methylfentanyl.
  38. ↑ Behind the Identification of China White Analytical Chemistry, 53(12), 1379A-1386A (1981)
  39. ↑ Van Bever W, Niemegeers C, Janssen P (1974). "Synthetic analgesics. Synthesis and pharmacology of the diastereoisomers of N-(3-methyl-1-(2-phenylethyl)-4-piperidyl)-N-phenylpropanamide and N-(3-methyl-1-(1-methyl-2-phenylethyl)-4-piperidyl)-N-phenylpropanamide". J Med Chem. 17 (10): 1047–51. doi:10.1021/jm00256a003. PMID 4420811. 
  40. ↑ "Russia names Moscow siege gas". 
  41. ↑ Shachtman, Noah (September 10, 2009). "Airborne EMTs Shave Seconds to Save Lives in Afghanistan". Wired.com. Retrieved July 1, 2010. 
  42. ↑ Shapiro, Rick (5 November 2008). "Fentanyl Patch Drug Associated with Overdoses & Death Claims". InjuryBoard.com. Retrieved 31 August 2009. 
  43. ↑ "Fentanyl Pain Patch Fatal Overdose Risk Causes Watson Patch Recall". BagolieFriedman.com. 13 August 2009. Retrieved 31 August 2009. 
  44. ↑ "Fentanyl Transdermal System (marketed as Duragesic and generics)". Postmarket Drug Safety Information for Patients and Providers. FDA. 30 April 2009. Retrieved 31 August 2009. 
  45. ↑ "Coroner: Painkiller killed ex-Wilco member". Chicago Tribune. 2009-06-23. Retrieved 2010-08-20. 
  46. ↑ "Slipknot bassist Paul Gray died of morphine overdose". BBC News. 2010-06-21. Retrieved 2010-07-28. 
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