|Trade names||Dilaudid, Hydromorph Contin, Palladone, others|
|Side effects||Dizziness, sleepiness, nausea, itchiness, constipation|
|By mouth, intramuscular, intravenous, subcutaneous|
|Onset of action||15 to 30 min|
|Duration of action||4 to 5 hrs|
|Defined daily dose||20 mg (by mouth)|
4 mg (injection, rectal)
|Bioavailability||By mouth: 30–35%, Intranasal: 52–58% IV/IM:100%|
|Elimination half-life||2–3 hours|
|Chemical and physical data|
|Molar mass||285.343 g·mol−1|
|3D model (JSmol)|
|Solubility in water||HCl salt: 333 mg/mL (20 °C)|
Hydromorphone, also known as dihydromorphinone, and sold under the brand name Dilaudid among others, is an opioid used to treat moderate to severe pain. Typically, long-term use is only recommended for pain due to cancer. It may be used by mouth or by injection into a vein, muscle, or under the skin. Effects generally begin within half an hour and last for up to five hours.
Common side effects include dizziness, sleepiness, nausea, itchiness, and constipation. Serious side effects may include abuse, low blood pressure, seizures, respiratory depression, and serotonin syndrome. Rapidly decreasing the dose may result in opioid withdrawal. Generally, use during pregnancy or breastfeeding is not recommended. Hydromorphone is believed to work by activating opioid receptors, mainly in the brain and spinal cord. Hydromorphone 2 mg by mouth is equivalent to approximately 10 mg morphine by mouth.
Hydromorphone was patented in 1923. It is available as a generic medication. In the United Kingdom it costs the NHS about £0.32 per 2 mg tablet as of 2019. In the United States the wholesale cost of this amount is about US$0.07. In 2017, it was the 205th most commonly prescribed medication in the United States, with more than two million prescriptions. Hydromorphone is made from morphine.
Hydromorphone is used to treat moderate to severe pain. It may be used by mouth or by injection into a vein, muscle, or under the skin. Effects generally begin within half an hour and last for up to five hours. Typically, long-term use is only recommended for pain due to cancer. A 2016 Cochrane review found little difference in benefit between hydromorphone and other opioids for cancer pain.
Adverse effects of hydromorphone are similar to those of other potent opioid analgesics, such as morphine and heroin. The major hazards of hydromorphone include dose-related respiratory depression, urinary retention, bronchospasm, and sometimes, circulatory depression. More common side effects include lightheadedness, dizziness, sedation, itching, constipation, nausea, vomiting, headache, perspiration, and hallucinations. These symptoms are common in ambulatory patients and in those not experiencing severe pain.
Simultaneous use of hydromorphone with other opioids, muscle relaxants, tranquilizers, sedatives, and general anesthetics may cause a significant increase in respiratory depression, progressing to coma or death. Taking benzodiazepines (such as diazepam) in conjunction with hydromorphone may increase side effects such as dizziness and difficulty concentrating. If simultaneous use of these drugs is required, dose adjustment may be made.
A particular problem that may occur with hydromorphone is accidental administration in place of morphine due to a mix-up between the similar names, either at the time the prescription is written or when the drug is dispensed. This has led to several deaths and calls for hydromorphone to be distributed in distinctly different packaging from morphine to avoid confusion.
Massive overdoses are rarely observed in opioid-tolerant individuals, but when they occur, they may lead to circulatory system collapse. Symptoms of overdose include respiratory depression, drowsiness leading to coma and sometimes to death, drooping of skeletal muscles, low heart rate, and decreasing blood pressure. At the hospital, individuals with hydromorphone overdose are provided supportive care, such as assisted ventilation to provide oxygen and gut decontamination using activated charcoal through a nasogastric tube. Opioid antagonists, such as naloxone, also may be administered concurrently with oxygen supplementation. Naloxone works by reversing the effects of hydromorphone, and only is administered in the presence of significant respiratory depression and circulatory depression.
Sugar cravings associated with hydromorphone use are the result of a glucose crash after transient hyperglycemia following injection, or a less profound lowering of blood sugar over a period of hours, in common with morphine, heroin, codeine, and other opiates.
In the setting of prolonged use, high dosage, and/or kidney dysfunction, hydromorphone has been associated with neuroexcitatory symptoms such as tremor, myoclonus, agitation, and cognitive dysfunction. This toxicity is less than that associated with other classes of opioids such as the pethidine class of synthetics in particular.
Users of hydromorphone may experience painful symptoms if the drug is suspended. Some people cannot tolerate the symptoms, which results in continuous drug use. Symptoms of opioid withdrawal are not easy to decipher, as there are differences between drug-seeking behaviors and true withdrawal effects. Symptoms associated with hydromorphone withdrawal include:
- Abdominal pain
- Anxiety or panic attacks
- Goose bump skin
- Inability to enjoy daily activities
- Muscle and joint pain
- Runny nose and excessive secretion of tears
In the clinical setting, excessive secretion of tears, yawning, and dilation of pupils are helpful presentations in diagnosing opioid withdrawal. Hydromorphone is a rapid acting pain killer; however, some formulations may last up to several hours. Patients who stop taking this drug abruptly may experience withdrawal symptoms, which may start within hours of taking the last dose of hydromorphone, and last up to several weeks. Withdrawal symptoms in people who stopped taking the opioid may be managed by using opioids or non-opioid adjuncts. Methadone is an opioid commonly used for this kind of therapy. However, the selection of therapy should be tailored to each specific person. Methadone also is used for detoxification in people who have opioid addiction, such as heroin or drugs similar to morphine. It may be given orally or intramuscularly. There is controversy regarding the use of opioids for people experiencing withdrawal symptoms, since these agents also may cause relapse on patients when they suspend therapy. Clonidine is a non-opioid adjunct, which may be used in situations where opioid use is not desired, such as in patients with high blood pressure.
CNS depressants may enhance the depressant effects of hydromorphone, such as other opioids, anesthetics, sedatives, hypnotics, barbiturates, benzodiazepines, phenothiazines, chloral hydrate, dimenhydrinate, and glutethimide. The depressant effect of hydromorphone also may be enhanced by monoamine oxidase inhibitors (MAO inhibitors), first-generation antihistamines (brompheniramine, promethazine, diphenhydramine, chlorphenamine), beta blockers, and alcohol. When combined therapy is contemplated, the dose of one or both agents should be reduced.
|0.47 nM||18.5 nM||24.9 nM||1:39:53|
Hydromorphone is a semi-synthetic μ-opioid agonist. As a hydrogenated ketone of morphine, it shares the pharmacologic properties typical of opioid analgesics. Hydromorphone and related opioids produce their major effects on the central nervous system and gastrointestinal tract. These include analgesia, drowsiness, mental clouding, changes in mood, euphoria or dysphoria, respiratory depression, cough suppression, decreased gastrointestinal motility, nausea, vomiting, increased cerebrospinal fluid pressure, increased biliary pressure, and increased pinpoint constriction of the pupils.
Hydromorphone is available in parenteral, rectal, subcutaneous, and oral formulations, and also can be administered via epidural or intrathecal injection. Hydromorphone also has been administered via nebulization to treat shortness of breath, but it is not used as a route for pain control due to low bioavailability. Transdermal delivery systems are also under consideration to induce local skin analgesia.
Concentrated aqueous solutions of hydromorphone hydrochloride have a visibly different refractive index from pure water, isotonic 9‰ (0·9 per cent) saline and the like, especially when stored in clear ampoules and phials may acquire a slight clear amber discolouration upon exposure to light; this reportedly has no effect on the potency of the solution, but 14-dihydromorphinones such as hydromorphone, oxymorphone, and relatives come with instructions to protect from light. Ampoules of solution which have developed a precipitate should be discarded.
Battery-powered intrathecal drug delivery systems are implanted for chronic pain when other options are ruled out, such as surgery and traditional pharmacotherapy, provided that the patient is considered a suitable fit in terms of any contraindications, both physiological and psychological.
An extended-release (once-daily) version of hydromorphone is available in the United States. Previously, an extended-release version of hydromorphone, Palladone, was available before being voluntarily withdrawn from the market after a July 2005 FDA advisory warned of a high overdose potential when taken with alcohol. As of March 2010, it is still available in the United Kingdom under the brand name Palladone SR, Nepal under the brand name Opidol, and in most other European countries.
The chemical modification of the morphine molecule to hydromorphone results in higher lipid solubility and greater ability to cross the blood–brain barrier to produce more rapid and complete central nervous system penetration. On a per milligram basis, hydromorphone is considered to be five times as potent as morphine; although the conversion ratio may vary from 4–8 times, five times is in typical clinical usage. The development of tolerance also may vary among individuals.
Patients with renal abnormalities must exercise caution when dosing hydromorphone. In those with renal impairment, the half-life of hydromorphone may increase to as much as 40 hours. The typical half-life of intravenous hydromorphone is 2.3 hours. Peak plasma levels usually occur between 30 and 60 minutes after oral dosing.
The onset of action for hydromorphone administered intravenously is less than 5 minutes and within 30 minutes of oral administration (immediate release).
While other opioids in its class, such as codeine or oxycodone, are metabolized via CYP450 enzymes, hydromorphone is not. Hydromorphone is extensively metabolized in the liver to hydromorphone-3-glucoronide, which has no analgesic effects. As similarly seen with the morphine metabolite, morphine-3-glucoronide, a build-up in levels of hydromorphone-3-glucoronide may produce excitatory neurotoxic effects such as restlessness, myoclonus and hyperalgesia. Patients with compromised kidney function and older patients are at higher risk for metabolite accumulation.
With a formula of C17H19NO3 and a molecular weight of 285.343, both identical to morphine, hydromorphone can be considered a structural isomer of morphine and is a hydrogenated ketone thereof.
Hydromorphone is made from morphine either by direct re-arrangement (made by reflux heating of alcoholic or acidic aqueous solution of morphine in the presence of platinum or palladium catalyst) or reduction to dihydromorphine (usually via catalytic hydrogenation), followed by oxidation with benzophenone in presence of potassium tert butoxide or aluminium tert butoxide (Oppenauer oxidation). The 6 ketone group may be replaced with a methylene group via the Wittig reaction to produce 6-Methylenedihydrodesoxymorphine, which is 80× stronger than morphine.
Changing morphine into hydromorphone increases its activity and, therefore, makes hydromorphone approximately eight times stronger than morphine on a weight basis, all other things being equal. Changed also is lipid solubility, contributing to hydromorphone's having a more rapid onset of action and alterations to the overall absorption, distribution, metabolism, and elimination profile as well as the side effect profile (in general, less nausea and itching) versus that of morphine. The semi-synthetic opiates, of which hydromorphone and its codeine analogue hydrocodone are among the best-known and oldest, include a huge number of drugs of varying strengths and with differences among themselves both subtle and stark, allowing for many different options for treatment.
Hydromorphone is more soluble in water than morphine; therefore, hydromorphone solutions may be produced to deliver the drug in a smaller volume of water. The hydrochloride salt is soluble in three parts of water, whereas a gram of morphine hydrochloride dissolves in 16 ml of water; for all common purposes, the pure powder for hospital use can be used to produce solutions of virtually arbitrary concentration. When the powder appeared on the street, this very small volume of powder needed for a dose means that overdoses are likely for those who mistake it for heroin or other powdered narcotics, especially those that have been diluted prior to consumption.
Hydromorphone is made from morphine via catalytic hydrogenation and also is produced in trace amounts by human and other mammalian metabolisms of morphine. It occasionally appears in assays of opium latex in very small quantities, apparently forming in the plant in an unknown percentage of cases under poorly understood conditions.
Some bacteria have been shown to be able to turn morphine into closely related drugs, including hydromorphone and dihydromorphine among others. The bacterium Pseudomonas putida serotype M10 produces a naturally-occurring NADH-dependent morphinone reductase that can work on unsaturated 7,8 bonds, with result that, when these bacteria are living in an aqueous solution containing morphine, significant amounts of hydromorphone form, as it is an intermediary metabolite in this process; the same goes for codeine being turned into hydrocodone.
The process gave rise to various concentrations of hydromorphone, dihydromorphine, hydromorphinol, and oxymorphone during the experiments. Three paths were found: from morphine to hydromorphone with dihydromorphine as the penultimate step, from morphine to hydromorphone with morphinone as the penultimate step, and from morphine to hydromorphinol to hydromorphone.
Hydromorphone was patented in 1923. It was introduced to the mass market in 1926 under the brand name Dilaudid, indicating its derivation and degree of similarity to morphine (by way of laudanum).
Society and culture
In the United Kingdom it costs the NHS about £0.32 per 2 mg tablet as of 2019. In the United States the wholesale cost of this amount is about US$0.07. In 2017, it was the 205th most commonly prescribed medication in the United States, with more than two million prescriptions.
Hydromorphone is known in various countries around the world by the brand names Hydal, Dimorphone, Exalgo, Sophidone LP, Dilaudid, Hydrostat, Hydromorfan, Hydromorphan, Hymorphan, Laudicon, Opidol, Palladone, Hydromorph Contin, and others. An extended-release version of hydromorphone, called Palladone, was available for a short time in the United States before being voluntarily withdrawn from the market after a July 2005 FDA advisory warned of a high overdose potential when taken with alcohol. As of March 2010, it is still available in Nepal under the brand name Opidol, in the United Kingdom under the brand name Palladone SR, and in most other European countries.
In the United States, the main drug control agency, the Drug Enforcement Administration, reports an increase in annual aggregate production quotas of hydromorphone from 766 kilograms (1,689 pounds) in 1998 to 3,300 kilograms (7,300 lb) in 2006, and an increase in prescriptions in this time of 289%, from about 470,000 to 1,830,000. The 2013 production quota was 5,968 kilograms (13,157 lb).
Like all opioids used for analgesia, hydromorphone is potentially habit-forming and is listed in Schedule II of the United States Controlled Substances Act of 1970 as well as in similar levels under the drugs laws of practically all other countries and it is listed in the Single Convention On Narcotic Drugs. The DEA ACSCN for hydromorphone is 9150.
Hydromorphone is listed under the German Betäubungsmittelgesetz as a Betäubungsmittel in the most restricted schedule for medicinal drugs; it is controlled similarly in Austria (Suchtgift) under the SMG and the Swiss BetmG. The Misuse of Drugs Act 1971 (United Kingdom) and comparable French, Canadian, Australian, Italian, Czech, Croatian, Slovenian, Swedish, Polish, Spanish, Greek, Russian, and other laws similarly control it, as do regulations in virtually all other countries.
Use in executions
In 2009, Ohio approved the use of an intramuscular injection of 500 mg of hydromorphone and a supratherapeutic dose of midazolam as a backup means of carrying out executions when a suitable vein cannot be found for intravenous injection.
Hydromorphone and midazolam was injected intravenously to execute double-murderer Joseph Wood in Arizona on 24 July 2014. Wood was heavily sedated (surgical anesthesia) within four minutes from start, but took almost two hours to transition to stage 4 (cessation of respiration) and death.
- "Hydromorphone Hydrochloride Monograph for Professionals". Drugs.com. American Society of Health-System Pharmacists. Retrieved 15 April 2019.
- Bonewit-West, Kathy; Hunt, Sue A.; Applegate, Edith (2012). Today's Medical Assistant: Clinical and Administrative Procedures. Elsevier Health Sciences. p. 571. ISBN 9781455701506.
- "Hydromorphone Use During Pregnancy". Drugs.com. 19 November 2019. Retrieved 16 May 2020.
- "WHOCC - ATC/DDD Index". www.whocc.no. Retrieved 9 September 2020.
- Coda BA, Rudy AC, Archer SM, Wermeling DP (July 2003). "Pharmacokinetics and bioavailability of single-dose intranasal hydromorphone hydrochloride in healthy volunteers". Anesth. Analg. 97 (1): 117–23, table of contents. CiteSeerX 10.1.1.551.6509. doi:10.1213/01.ANE.0000066311.40978.4F. PMID 12818953.
- Vallner JJ, Stewart JT, Kotzan JA, Kirsten EB, Honigberg IL (April 1981). "Pharmacokinetics and bioavailability of hydromorphone following intravenous and oral administration to human subjects". J Clin Pharmacol. 21 (4): 152–6. doi:10.1002/j.1552-4604.1981.tb05693.x. PMID 6165742.
- British national formulary: BNF 76 (76 ed.). Pharmaceutical Press. 2018. pp. 24, 456. ISBN 9780857113382.
- "Hydromorphone Use During Pregnancy". Drugs.com. Retrieved 15 April 2019.
- Fischer, Jnos; Ganellin, C. Robin (2006). Analogue-based Drug Discovery. John Wiley & Sons. p. 526. ISBN 9783527607495.
- "NADAC as of 2019-02-27". Centers for Medicare and Medicaid Services. Retrieved 3 March 2019.
- "The Top 300 of 2020". ClinCalc. Retrieved 11 April 2020.
- "Hydromorphone Hydrochloride - Drug Usage Statistics". ClinCalc. Retrieved 11 April 2020.
- Vardanyan, Ruben; Hruby, Victor (2006). Synthesis of Essential Drugs. Elsevier. p. 25. ISBN 9780080462127.
- Bao, Yan J.; Hou, Wei; Kong, Xiang Y.; Yang, Liping; Xia, Jun; Hua, Bao J.; Knaggs, Roger (11 October 2016). "Hydromorphone for cancer pain". The Cochrane Database of Systematic Reviews. 10: CD011108. doi:10.1002/14651858.CD011108.pub2. ISSN 1469-493X. PMC 6457981. PMID 27727452.
- Hydromorphone Monograph Archived 13 February 2008 at the Wayback Machine (Side Effects & Drug Interactions)
- "Drug interactions between Dilaudid and Valium". Retrieved 19 November 2014.
- "Dilaudid (hydromorphone hydrochloride) Oral LiquidDilaudid (hydromorphone hydrochloride) Tablets". app.purduepharma.com. Retrieved 5 November 2015.
- Cohen, MR (June 1992). "Doctor was thinking of the wrong drug". Nursing. 22 (6): 25. doi:10.1097/00152193-199206000-00009. PMID 1377371.
- Tuohy, N; Paparella, S (December 2005). "Look-alike and sound-alike drugs: errors just waiting to happen". J Emerg Nurs. 31 (6): 569–71. doi:10.1016/j.jen.2005.07.012. PMID 16308048.
- Brennan, MJ (2013). "The effect of opioid therapy on endocrine function". The American Journal of Medicine. 126 (3 Suppl 1): S12–8. doi:10.1016/j.amjmed.2012.12.001. PMID 23414717.
- Thwaites, D; McCann, S; Broderick, P (August 2004). "Hydromorphone neuroexcitation". Journal of Palliative Medicine. 7 (4): 545–50. doi:10.1089/1096621041838362. PMID 15353098.
- Gagnon, DJ; Jwo, K (2013). "Tremors and agitation following low-dose intravenous hydromorphone administration in a patient with kidney dysfunction". Annals of Pharmacotherapy. 47 (7–8): e34. doi:10.1345/aph.1R784. PMID 23715067.
- Rapp, SE; Egan, KJ; Ross, BK; et al. (May 1996). "A multidimensional comparison of morphine and hydromorphone patient-controlled analgesia". Anesth. Analg. 82 (5): 1043–8. doi:10.1213/00000539-199605000-00029. PMID 8610865.
- "Hydromorphone / Dilaudid Detox". Rapid Drug Detox. Retrieved 5 November 2015.
- "Dilaudid Abuse & Addiction Withdrawals, Signs, Symptoms & Effects – Acadiana Addiction Center". www.acadianaaddiction.com. Retrieved 5 November 2015.
- "Hydromorphone Drug Information". Narconon International. Retrieved 5 November 2015.
- "Withdrawal Syndromes: Practice Essentials, Background, Pathophysiology". 5 February 2019. Cite journal requires
- "DILAUDID® ORAL LIQUID and DILAUDID® TABLETS Package Insert" (PDF). FDA. 2007. Retrieved 5 November 2015.
- "Opioid withdrawal protocol" (PDF). www.saskatoonhealthregion.ca. Archived from the original (PDF) on 25 November 2015. Retrieved 5 November 2015.
- Treatment, Center for Substance Abuse (1 January 2004). "4 Treatment Protocols". Substance Abuse and Mental Health Services Administration (US). Cite journal requires
- Bell CC (1983). "Simultaneous treatment of hypertension and opiate withdrawal using an alpha 2 adrenergic agonist". J Natl Med Assoc. 75 (1): 89–93. PMC 2561435. PMID 6131140.
- Filizola M, Villar HO, Loew GH (January 2001). "Molecular determinants of non-specific recognition of delta, mu, and kappa opioid receptors". Bioorg. Med. Chem. 9 (1): 69–76. doi:10.1016/S0968-0896(00)00223-6. PMID 11197347.
- King (25 October 2010). Pharmacology for Women's Health. Jones & Bartlett Publishers. pp. 332–. ISBN 978-1-4496-1073-9.
- David H. Chestnut; Cynthia A Wong; Lawrence C Tsen; Warwick D Ngan Kee, Yaakov Beilin, Jill Mhyre (28 February 2014). Chestnut's Obstetric Anesthesia: Principles and Practice E-Book. Elsevier Health Sciences. pp. 611–. ISBN 978-0-323-11374-8.CS1 maint: multiple names: authors list (link)
- Adriana P. Tiziani (1 June 2013). Havard's Nursing Guide to Drugs. Elsevier Health Sciences. pp. 933–. ISBN 978-0-7295-8162-2.
- Nersesyan, Hrachya; Slavin, Konstantin V (1 June 2007). "Current aproach [sic] to cancer pain management: Availability and implications of different treatment options". Therapeutics and Clinical Risk Management. 3 (3): 381–400. ISSN 1176-6336. PMC 2386360. PMID 18488078.
- Sarhill, Nabeel; Walsh, Declan; Nelson, Kristine A. (9 February 2014). "Hydromorphone: pharmacology and clinical applications in cancer patients". Supportive Care in Cancer. 9 (2): 84–96. doi:10.1007/s005200000183. ISSN 0941-4355. PMID 11305075.
- Smith, A.; Gomez-Panzani, E.; Mills, S.; Rainey, G.; Tolia, G.; Tagliaferri, F.; Spratlin, V. (2006). "(807) 24-hour transdermal delivery of hydromorphone hydrochloride". The Journal of Pain (Clinical trial abstract). 7 (4): S52. doi:10.1016/j.jpain.2006.01.209. ISSN 1526-5900.
- Dilaudid HP package insert Nov 2004
- Knight, Karen H. (February 2007). "Implantable Intrathecal Pumps for Chronic Pain: Highlights and Updates". Croatian Medical Journal. 48 (1): 22–34. PMC 2080496. PMID 17309136.
- "EXALGO (hydromorphone hydrochloride) extended release tablets Package Insert" (PDF). FDA. 2010. Retrieved 5 November 2015.
- "zalicus.com". www.zalicus.com. Retrieved 2 September 2017.
- "Opioid Conversion Guidelines" (PDF). alfredhealth.org.au. Archived from the original (PDF) on 4 March 2016. Retrieved 2 September 2017.
- "Switching Opioids" (PDF). mcmaster.ca. Retrieved 2 September 2017.
- "Hydromorphone". That's Poppycock!. 19 February 2009.
- "Dilaudid Clinical Pharmacology". rxlist.com. Archived from the original on 12 June 2008. Retrieved 2 September 2017.
- Gregory, Thomas B. (2013). "Hydromorphone: Evolving to Meet the Challenges of Today's Health Care Environment". Clinical Therapeutics. 35 (12): 2007–2027. doi:10.1016/j.clinthera.2013.09.027. PMID 24290733.
- http://www.painweek.org/../292-50.pdf[permanent dead link]
- Buck, Marcia (July 2008). "Use of Hydromorphone in Children and Adolescents" (PDF). University of Virginia Children's Hospital. Retrieved 5 November 2015.
- Merck Index 2003, "Morphine" and "Hydromorphone"
- PHA 4220 – Neurology Pharmacotherapeutics Archived 16 July 2007 at the Wayback Machine
- Hydromorphone Hydrochloride; MSDS No. 71681; Purdue Pharma L.P.: Stamford, CT, 13 October 2009. http://www.purduepharma.com/msdss/Dilaudid_2_4_8mgTablets_OralLiquid_MSDS.pdf (accessed 5 November 2015) Archived 17 January 2015 at the Wayback Machine
- Long, MT; Hailes, AM; Kirby, GW; Bruce, NC (October 1995). "Transformations of morphine alkaloids by Pseudomonas putida M10". Appl. Environ. Microbiol. 61 (10): 3645–9. doi:10.1128/AEM.61.10.3645-3649.1995. PMC 167664. PMID 7487001.
- Felden, L; Walter, C; Harder, S; et al. (22 September 2011). "Comparative Clinical Effects of Hydromorphone and Morphine". British Journal of Anaesthesia. 107 (3): 319–328. doi:10.1093/bja/aer232. PMID 21841049. Retrieved 20 September 2019.
- "Information for Healthcare Professionals: Hydromorphone Hydrochloride Extended-Release Capsules (marketed as Palladone)". Center for Drug Evaluation and Research. 15 July 2005. Retrieved 16 August 2016.
- "EXALGO safety profile". 1 March 2013. Archived from the original on 1 March 2013. Retrieved 2 September 2017.
- "Proposed Adjustments to the Aggregate Production Quotas for Schedule I and II Controlled Substances and Assessment of Annual Needs for the List I Chemicals Ephedrine, Pseudoephedrine, and Phenylpropanolamine for 2013". Drug Enforcement Administration (DEA), Department of Justice. 20 June 2014. Retrieved 26 July 2014.
- "Ohio Prisons Director Announces Changes to Ohio's Execution Process". Ohio Department of Rehabilitation and Correction. 13 November 2009. Archived from the original on 15 January 2013. Retrieved 17 January 2014.
- "Arizona execution takes two hours". BBC News. 24 July 2014. Retrieved 24 July 2014.
- Article discussing withdrawal of extended-release hydromorphone from the U.S. market
- Dihydromorphinones from morphine & analogues
- United States DEA's perspective, including statistics on manufacture and prescription levels from 1998 to 2006
- "When is a pain doctor a drug pusher?", The New York Times, 17 Jun 2007