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Fentanyl

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Fentanyl
Fentanyl2DCSD.svg
Fentanyl-xtal-3D-balls.png
Clinical data
Trade names Actiq, Duragesic, Fentora, others
AHFS/Drugs.com Monograph
Pregnancy
category
  • AU: C
  • US: C (Risk not ruled out)
Dependence
liability		 Very high
Routes of
administration		 TD, IM, IV, oral transmucosal, sublingual, buccal
Drug class Opioid
ATC code N01AH01 (WHO) N02AB03 (WHO)
Legal status
Legal status
Pharmacokinetic data
Bioavailability 92% (transdermal)
89% (intranasal)
50% (buccal)
33% (ingestion)
Protein binding 80–85%
Metabolism hepatic, primarily by CYP3A4
Onset of action 5 minutes[1]
Biological half-life IV: 10–20 mins (T1/2 β)
2–4 hours (T1/2 ɣ)
Intranasal: 6.5 mins
Transdermal: 20–27 h[2]
Sublingual/buccal (single dose): 5.4–6.3 h[3]
Duration of action IV: 30–60 minutes[4]
30–40 min[1]
Excretion 60% urinary (metabolites, <10% unchanged drug)[5]
Identifiers
CAS Number 437-38-7 YesY
PubChem (CID) 3345
IUPHAR/BPS 1626
DrugBank DB00813 YesY
ChemSpider 3228 YesY
UNII UF599785JZ YesY
KEGG D00320 YesY
ChEBI CHEBI:119915 YesY
ChEMBL CHEMBL596 YesY
ECHA InfoCard 100.006.468
Chemical and physical data
Formula C22H28N2O
Molar mass 336.471 g/mol
3D model (Jmol) Interactive image
Melting point 87.5 °C (189.5 °F)
  (verify)

Fentanyl (also known as fentanil) is a potent, synthetic opioid pain medication with a rapid onset and short duration of action.[6] It is a potent agonist at the μ-opioid receptors. Fentanyl is 50 to 100 times more potent than morphine.[7]

Fentanyl was first made by Paul Janssen in 1960,[8] following the medical inception of pethidine (also known as meperidine, marketed as Demerol) several years earlier. Janssen developed fentanyl by assaying analogues of the structurally related drug pethidine for opioid activity.[9] The widespread use of fentanyl triggered the production of fentanyl citrate (the salt formed by combining fentanyl and citric acid in a 1:1 stoichiometric ratio),[10] which entered medical use as a general anaesthetic under the trade name Sublimaze in the 1960s. Following this, many other fentanyl analogues were developed and introduced into medical practice, including sufentanil, alfentanil, remifentanil, and lofentanil.

In the mid-1990s, fentanyl was introduced for palliative use with the fentanyl patch, followed in the next decade by the introduction of the fentanyl lollipop, dissolving tablets, and sublingual spray which are absorbed through the skin inside the mouth.[11][12] As of 2012, fentanyl was the most widely used synthetic opioid in medicine.[13] In 2013, 1700 kilograms were used globally.[14]

Fentanyl is also used as a recreational drug, and this use has led to thousands of overdose deaths each year from 2000 to 2015.[15][16] Deaths have also resulted from improper medical use.[17] Fentanyl has a relatively wide therapeutic index (270)[18] which makes it a very safe surgical anesthetic when monitored carefully; however, its extreme potency requires careful measurements of highly diluted fentanyl in solution; attempting to accurately measure a dose of pure fentanyl powder is impractical without advanced scientific equipment as an effective dose and a lethal dose of fentanyl powder placed next to each other would be difficult or impossible to differentiate with the naked eye.

Medical uses[edit]

Intravenous[edit]

Intravenous fentanyl is often used for anesthesia and analgesia. During anaesthesia it is often used along with a hypnotic agent like propofol. Fentanyl may be included in a solution along with local anesthetic for neuraxial administration (epidural or intrathecal/spinal). It is also administered in combination with a benzodiazepine, such as midazolam, to produce sedation for procedures such as endoscopy, cardiac catheterization, and oral surgery. It is often used in the management of chronic pain including cancer pain.[citation needed]

Patches[edit]

A fentanyl patch from Israel

Fentanyl transdermal patches (Durogesic/Duragesic) are used in chronic pain management. The patches work by slowly releasing fentanyl through the skin into the bloodstream over 48 to 72 hours, allowing for long-lasting pain management.[19] Dosage is based on the size of the patch, since, in general, the transdermal absorption rate is constant at a constant skin temperature.[19] 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. Under normal circumstances, the patch will reach its full effect within 12 to 24 hours; thus, fentanyl patches are often prescribed with a fast-acting opiate (such as morphine or oxycodone) to handle breakthrough pain.[19]

It is unclear if fentanyl gives pain relief to people with neuropathic pain.[20]

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

  • people already stabilized on other opioids who have persistent swallowing problems and cannot tolerate other parenteral routes such as subcutaneous administration.
  • people with moderate to severe renal failure.
  • troublesome side effects of oral morphine, hydromorphone, or oxycodone.[citation needed]

Care must be taken to guard against the application of external heat sources (such as direct sunlight, heating pads, etc.) which in certain circumstances can trigger the release of too much medication and cause life-threatening complications.

Duragesic was first approved by the College ter Beoordeling van Geneesmiddelen, the Medicines Evaluation Board in the Netherlands, on July 17, 1995, as 25, 50, 75 and 100 µg/h formulations after a set of successful clinical trials, and on October 27, 2004, the 12 µg/h formulation was approved as well. On Jan 28, 2005, the U.S. Food and Drug Administration approved first-time generic formulations of 25, 50, 75, and 100 µg/h fentanyl transdermal systems (made by Mylan Technologies, Inc.; brand name Duragesic, made by Alza Corp.) through an FTC consent agreement derailing the possibility of a monopoly in the treatment of breakthrough chronic pain by Alza Corp. In some cases, physicians instruct patients to apply more than one patch at a time, giving a much wider range of possible dosages. For example, a patient may be prescribed a 37.5 µg dosage by applying one 12 µg patch and one 25 µg patch simultaneously, or contingent on the large size of the (largest) 100 μg/h patch, multiple patches are commonly prescribed for doses exceeding 100μg/h, such as two 75 μg/h patches worn to afford a 150 μg/h dosage regimen. Although the commonly referred to dosage rates are 12/25/50/75/100 µg/h, the "12 µg" patch actually releases 12.5 µg/h.[21] It is designed to release half the dose of the 25 µg/h dose patch.

Duragesic is manufactured by ALZA Corporation and marketed by Janssen Pharmaceutica (both subsidiaries of Johnson & Johnson). During the period of June 2002 through June 2003, Duragesic sales totaled more than $1 billion.

As of July 2009, construction of the Duragesic patch had been changed from the gel pouch and membrane design to "a drug-in-adhesive matrix designed formulation", as described in the prescribing information.[21] This construction makes illicit use of the fentanyl more difficult.

Storage and Disposal[edit]

The fentanyl patch is one of a small number of drugs that may be especially harmful, and in some cases fatal, with just one dose, if used by someone other than the person for whom the drug was prescribed.[22] Unused fentanyl patches should be kept in a secure location that is out of children’s sight and reach, such as a locked cabinet.

When patches cannot be disposed of through a drug take-back program, flushing is recommended for fentanyl patches because it is the fastest and surest way to remove them from the home so they cannot harm children, pets and others who were not intended to use them.[22][23][24]

Recalls[edit]

In February 2004, a leading fentanyl supplier, Janssen Pharmaceutica Products, L.P., recalled one lot of fentanyl (brand name: Duragesic) patches because of seal breaches which may have allowed the drug to leak from the patch. Janssen also later recalled additional lots; a series of Class II recalls were initiated in March 2004 due to a potentially life-threatening manufacturing defect.[citation needed]

The 25 µg/h Duragesic patches manufactured by ALZA Corporation were also recalled in February 2008 due to a concern that small cuts in the gel reservoir could result in accidental exposure of patients or health care providers to the fentanyl gel.[25]

In February 2011, the manufacturer suspended production of all Duragesic patches due to quality control issues involving unspecified "microscopic crystallization" detected during the manufacturing process of the 100 µg/h strength.[citation needed]

Intranasal[edit]

The bioavailability of intranasal fentanyl is about 70-90 percent, but with some imprecision due to clotted nostrils, pharyngeal swallow and incorrect administration. For both emergency and palliative use, intranasal fentanyl is available in doses of 50, 100, and 200 micrograms. In emergency medicine, safe administration of intranasal fentanyl with a low rate of side effects and a promising pain reducing effect was demonstrated in a prospective observational study in about 900 out-of-hospital patients.[26]

In children, intranasal fentanyl is useful for the treatment of moderate and severe pain and is well tolerated.[27]

Sublingual[edit]

Abstral dissolves quickly and is absorbed through the sublingual mucosa to provide rapid analgesia.[28] Fentanyl is a highly lipophilic compound,[28][29] which is well absorbed sublingually[28] and generally well tolerated.[28] Such forms are particularly useful for breakthrough cancer pain episodes, which are often rapid in onset, short in duration and severe in intensity.[30]

Lozenges[edit]

Package and example of fentanyl lollipop (brand: Actiq), 400 micrograms.

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.[31] It has also been used for breakthrough pain for patients with nonmalignant (not cancer related) pain, but this application is controversial.[32] The unit is a berry-flavored lozenge on a stick 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 within 15 minutes. About 25 percent of the drug is absorbed through the oral mucosa, resulting in a fast onset of action, and the rest is swallowed and absorbed in the small intestine, acting more slowly. The lozenge is less effective and acts more slowly if swallowed as a whole, as despite good absorbance from the small intestine there is extensive first-pass metabolism, leading to an oral bioavailability of about 33 percent as opposed to 50 percent when used correctly, (25 percent via the mouth mucosa and 25 percent via the gut).[31]

However, most people find that it takes 10–15 minutes to use all of one lozenge, and those with a dry mouth cannot use this route. In addition, medical personnel are unable to document how much of a lozenge has been used by a person, making drug records inaccurate.[citation needed]

Actiq is produced by the pharmaceutical company Cephalon on a plastic stick that dissolves slowly in the mouth for absorption across the buccal mucosa, in a manner similar to sublingual buprenorphine/naloxone film strips. An Actiq lozenge contains two grams of sugar[33] (eight calories). Actiq has been linked to dental decay, with some users who had no prior dental issues suffering tooth loss, and in the U.S many users have started their own Facebook pages to educate users about the severe dental issues caused by the so-called fentanyl lollipops. CBS News reported the issue 28 September 2009. The status of a sugar-free version, called Actiq-SF, is unclear. Since the release of Fentora—an effervescent buccal fentanyl tablet for breakthrough cancer pain—Cephalon has indefinitely postponed plans to release a sugar free version of Actiq.[citation needed]

Beginning late September, 2006, a generic "oral transmucosal fentanyl citrate" has been available, made by Barr Pharmaceuticals.[34]

The United States Air Force Pararescue and Swedish armed forces combat medics utilize lollipops with fentanyl.[35] Navy corpsmen working with the United States Marine Corps in Afghanistan use Fentanyl lollipops on combat casualties from IED blasts and other mechanisms of injury. The lollipop is taped to the casualty's finger and inserted in between the teeth and cheek (buccal area) of the patient. When enough of the medication has been absorbed the finger will generally fall from the patient's mouth, thereby indicating that the medication has become effectively administered.

Other[edit]

A wide range of fentanyl preparations are available, including buccal tablets or patches, nasal sprays, inhalers, and active transdermal patches (heat or electrical).[citation needed] 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. In addition, the expense of some of these appliances may greatly reduce their cost-effectiveness. In children it is unclear if intranasal fentanyl is as good as or the same as morphine.[36]

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 localized than morphine, and some clinicians prefer to use morphine to get a wider spread of analgesia.[citation needed]

A fentanyl patient-controlled transdermal system (PCTS) is under development, which aims to allow patients to control administration of fentanyl through the skin during the treatment of perioperative pain.[37]

The Danish Army uses the fentanyl stick in military operations as a painkiller. The war documentary Armadillo (2010) features an interview with a Danish medic who tells of using fentanyl on a severely wounded soldier in Afghanistan.[citation needed]

Adverse effects[edit]

Fentanyl's most common side effects (more than 10 percent of patients) include diarrhea, nausea, constipation, dry mouth, somnolence, confusion, asthenia (weakness), sweating, and less frequently (3 percent to 10 percent 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.[38]

Despite being a more potent analgesic, fentanyl tends to induce less nausea, as well as less histamine-mediated itching, in relation to morphine.[39]

Fentanyl may produce more prolonged respiratory depression than other opioid analgesics.[40][41][42][43][44][45][46] In 2006 the U.S. Food and Drug Administration (FDA) began investigating several respiratory deaths, but doctors in the United Kingdom were not warned of the risks with fentanyl until September 2008.[47] The FDA reported in April 2012 that twelve young children had died and twelve more made seriously ill from separate accidental exposures to fentanyl skin patches.[48]

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 percent 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.[18]

Overdose[edit]

In July 2014, the Medicines and Healthcare Products Regulatory Agency (MHRA) issued a warning about the potential for life-threatening harm from accidental exposure to transdermal fentanyl patches, particularly in children,[49] and advised that they should be folded, with the adhesive side in, before being discarded. The patches should be kept away from children, who are most at risk from fentanyl overdose.[50]

Death from fentanyl overdose was declared a public health crisis in Canada in September 2015, and it continues to be a major killer drug.[51] In 2016, deaths from fatal fentanyl overdoses in British Columbia, Canada, averaged two persons per day.[52]

Medical examiners concluded that musician Prince died on April 21, 2016, from an accidental fentanyl overdose. The drug was among many identified in counterfeit pills recovered from his home, especially some that were mislabeled as Watson 385, a combination of hydrocodone and paracetamol.[53][54]

Pharmacology[edit]

Main article: Opioid § Pharmacology

Fentanyl provides some of the effects typical of other opioids through its agonism of the opioid receptors. Its strong potency in relation to that of morphine is largely due to its high lipophilicity, per the Meyer-Overton correlation. Because of this, it can more easily penetrate the CNS.[39]

History[edit]

Fentanyl was first synthesized by Paul Janssen under the label of his relatively newly formed Janssen Pharmaceutica in 1959.[55] In the 1960s, fentanyl was introduced as an intravenous anesthetic under the trade name of Sublimaze.[citation needed] 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 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. 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.[citation needed]

A fentanyl product has been approved by the US Food and Drug Administration (FDA) for breakthrough cancer pain called Onsolis. It uses a drug delivery technology called BEMA (fentanyl buccal soluble film) on a small disc placed in the mouth. Unlike many other fentanyl products, the drug cannot be abused by crushing and inhaling.

Fentanyl has a US DEA ACSCN of 9801 and a 2013 annual aggregate manufacturing quota of 2108.75 kg, unchanged from the prior year.

Society and culture[edit]

Brand names[edit]

Brand names include Sublimaze,[38] Actiq, Durogesic, Duragesic, Fentora, Matrifen, Haldid, Onsolis,[56] Instanyl,[57] Abstral,[58] Lazanda[59] and others.[60]

Legal status[edit]

In the UK, fentanyl is classified as a controlled Class A drug under the Misuse of Drugs Act 1971.[61] In the Netherlands, fentanyl is a List I substance of the Opium Law. In the U.S., fentanyl is a Schedule II controlled substance per the Controlled Substance Act.

Distributors of Abstral are required to implement an FDA-approved risk evaluation and mitigation strategy (REMS) program.[62][63] In order to curb misuse, many health insurers have begun to require precertification and/or quantity limits for Actiq prescriptions.[64][65][66]

Legal action[edit]

On June 19, 2007, a $5.5 million jury verdict was awarded in a US case against Johnson & Johnson subsidiaries, Alza Corporation and Janssen Pharmaceutica Products, the manufacturers of the Duragesic fentanyl transdermal pain patch. This case, the first Federal trial involving the Duragesic fentanyl patch, was tried in the Federal District Court for the Southern District of Florida, West Palm Beach Division.

J&J has filed an opposition[67] to the trademark application Dermogesic filed by Minnesota High Tech Resources, LLC for their iontophoretic transdermal patch. The litigation has been ongoing since 2002. The trial has been completed. The parties are now drafting and filing their final briefs. J&J's main argument is that the Dermogesic mark dilutes their Durogesic brand and adds confusion in the marketplace. Obviously, Minnesota High Tech Resources, LLC disagrees with this position. Minnesota High Tech Resources, LLC is a very small biomedical research company owned by two individuals in Red Wing, MN.

Public health advisories[edit]

The US Food and Drug Administration (FDA) has issued public health advisories related to fentanyl patch dangers. Among these, in July 2005, the FDA issued a Public Health Advisory,[68] which advised that "deaths and overdoses have occurred in patients using both the brand name product Duragesic and the generic product." In December 2007, as part of this continuing investigation, the FDA issued a second Public Health Advisory[68] stating, "The FDA has continued to receive reports of deaths and life-threatening side effects in patients who use the fentanyl patch. The reports indicate that doctors have inappropriately prescribed the fentanyl patch... In addition, the reports indicate that patients are continuing to incorrectly use the fentanyl patch..."

Recreational use[edit]

Fentanyl powder seized by a sheriff.[69]

Illicit use of pharmaceutical fentanyl and its analogues first appeared in the mid-1970s in the medical community and continues in the present. United States authorities classify fentanyl as a narcotic and an opioid. To date, more than 12 different analogues of fentanyl have been produced clandestinely and identified in the U.S. drug traffic. The biological effects of the fentanyl analogues 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]

Fentanyl analogues may be hundreds of times more potent than street heroin, and tend to produce significantly more respiratory depression, making it much more dangerous than heroin to users. Fentanyl is used orally, smoked, snorted, or injected. Fentanyl is sometimes sold as heroin, often leading to overdoses. Many fentanyl overdoses are initially classified as heroin overdoses.[70] Estonia has the highest rate of 3-methylfentanyl overdose deaths in the EU, due to its high rate of recreational use.[71]

Fentanyl is sometimes sold on the black market in the form of transdermal fentanyl patches such as Duragesic, diverted from legitimate medical supplies. The gel from inside the patches may be ingested or injected.[72]

Another dosage form of fentanyl that has appeared on the streets is the Actiq fentanyl lollipops, which are sold under the street name of "percopop". The pharmacy retail price ranges from $15 to $50 per unit based on the strength of the lozenge, with the black market cost ranging from $5 to $25, depending on the dose.[73] The attorneys general of Connecticut and Pennsylvania have launched investigations into its diversion from the legitimate pharmaceutical market, including Cephalon's "sales and promotional practices for Provigil, Actiq and Gabitril".[73]

Non-medical use of fentanyl by individuals without opiate tolerance can be very dangerous and has resulted in numerous deaths.[72] 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 United States 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, therefore, very dangerous.[citation needed]

Some heroin dealers mix fentanyl powder with heroin 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 and Canada, heavily concentrated in the cities of Dayton, Ohio; Chicago; Detroit; and Philadelphia.[74]

Several large quantities of illicitly produced fentanyl have been seized by U.S. law enforcement agencies. In June 2006, 945 grams of 83 percent-pure fentanyl powder was seized by Border Patrol agents in California from a vehicle that had entered from Mexico.[75] Mexico is the source of much of the illicit fentanyl for sale in the U.S. However, in April 2006, there was one domestic fentanyl lab discovered by law enforcement 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.[76][77] In November of 2016, the DEA uncovered an operation making counterfeit oxycodone and Xanax from a home in Cottonwood Heights, Utah. They found about 70,000 pills in the appearance of oxycodone and more than 25,000 in the appearance of Xanax. The DEA reported that millions of pills could have been distributed from this location over the course of time. The accused owned a pill press and ordered fentanyl in powder form from China.[78][79]

The "China White" form of fentanyl refers to any of a number of clandestinely produced analogues, especially α-methylfentanyl (AMF).[80] This Department of Justice document lists "China White" as a synonym for a number of fentanyl analogues, including 3-methylfentanyl and α-methylfentanyl,[81] which today are classified as Schedule I drugs in the United States.[82] 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.[83]

In June 2013, the United States' Centers for Disease Control and Prevention (CDC) issued a health advisory[84] to emergency departments alerting to 14 overdose deaths among intravenous drug users in Rhode Island associated with acetylfentanyl, a synthetic opioid analog of fentanyl that has never been licensed for medical use.

Beginning in 2015, Canada has seen a widespread number of fentanyl overdoses. Authorities suspect that the drug is being imported from Asia to the western coast by organized crime groups in powder form and being pressed into pseudo-OxyContin tablets.[85] Traces of the drug have also been found in other recreational drugs including cocaine, MDMA, and heroin. The drug has been implicated in multiple deaths from the homeless to young professionals, including multiple teens and young parents.[86] Because of the rising deaths across the country, Health Canada is putting a rush on a review of the prescription-only status of Naloxone in an effort to combat overdoses of the drug.[87]

Incapacitating agent[edit]

Main article: Moscow hostage crisis chemical agent

Russian spetsnaz security forces used a "fentanyl gas" to incapacitate people rapidly in the Moscow theater hostage crisis. The siege was ended, but about 130 of the 850 hostages died from the gas. The Russian Health Minister later stated that the gas was based on fentanyl,[88] but the exact chemical agent has not been identified.

Veterinary use[edit]

Fentanyl in injectable formulation is commonly used for analgesia and as a component of balanced sedation and general anesthesia in small animal patients. Its potency and short duration of action make it particularly useful in critically ill patients. In addition, it tends to cause less vomiting and regurgitation than other pure-opioid agonists (morphine, hydromorphone) when given as a continuous post-operative infusion. As with other pure opioids, fentanyl can be associated with dysphoria in both dogs and cats.

Transdermal fentanyl has also been used for many years in dogs and cats for post-operative analgesia. This is usually done with off-label fentanyl patches manufactured for humans with chronic pain. In 2012 a highly concentrated (50 mg/ml) transdermal solution, trade name Recuvyra, has become commercially available for dogs only. It is FDA approved to provide four days of analgesia after a single application prior to surgery. It is not approved for multiple doses or other species.[89] The drug is also approved in Europe.[90]

See also[edit]

List of fentanyl analogues

References[edit]

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External links[edit]

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