|Trade names||Numorphan, Numorphone, Opana, others|
|By mouth, intravenous, intramusucular, subcutaneous, rectal, intranasal|
by mouth: 10%|
IV, IM: 100%
|Metabolism||Liver (CYP3A4, glucuronidation)|
|Elimination half-life||7–9 hours|
|Chemical and physical data|
|Molar mass||301.337 g/mol|
|3D model (JSmol)|
Oxymorphone, sold under the brand names Numorphan among others, is a powerful semi-synthetic opioid analgesic (painkiller) developed in Germany in 1914. Pain relief after injection begins after about 5–10 minutes and 15–30 minutes after rectal administration, and lasts about 3–4 hours for immediate-release tablets and 12 hours for extended-release tablets.
It is highly addictive and in June 2017 the FDA asked the manufacturer to remove its product from the US market. This was in part due to the opioid epidemic in the US, and the fact that the 2012 reformulation led to a shift in the route of abuse from nasal to injection. It was the first time in the history of the agency, that the FDA had made a request for removal regarding a product currently on the market. In response, by July 2017, Endo International voluntarily removed Opana ER from the market. Generic versions of extended release oxymorphone are still available for prescription use in the US.
Oxymorphone is indicated for the relief of moderate to severe pain, such as treatment of acute post surgical pain.  For any chronic treatment of pain, clinicians should only consider long term use if there is significant clinical benefits to the patient's therapy that outweigh the risks. The first line treatment choices for chronic pain are non-pharmacological and non-opioid agents. 
Oxymorphone extended-release tablets are indicated for the management of chronic pain and only for people already on a regular schedule of strong opioids for a prolonged period. Immediate-release oxymorphone tablets are recommended for breakthrough pain for people on the extended-release version. Compared to other opioids, oxymorphone has similar pain relieving efficacy. 
|Dosage Form||Indication(s) |
|IM/SubQ||Labor Analgesia, General Analgesia|
|Immediate Release||Acute Pain|
|Extended Release||Chronic Pain|
Brands and Forms
Oxymorphone is marketed by a single brand name manufacturer, Endo Pharmaceuticals, under the brand name(s) Opana and Opana ER. Recently, Opana ER was withdrawn by the manufacturer in 2017 () and is no longer available. However both IR (immediate release) and ER (extended release) options are available under the generic name Oxymorphone and Oxymorphone ER, provided by a multitude of different brands.
Oxymorphone is also available as an injectable for inpatient use, available for IV (intravenous), IM (intramuscular), and SubQ (subcutaneous) injection.
Oxymorphone Oral Dosage Forms
Oxymorphone comes in a variety of doses. As of 2017, brand name is currently only available in the IR form due to a request from the FDA to remove the brand name ER from the market to mitigate abuse (see Society and Culture).
|IR Tablet||ER 12 Hour Tablet |
Patients already suffering from debilitation are at a much higher risk of respiratory depression in these patients. Nonopioid analgesics should be considered in this population.
Elderly patients are much more sensitive to adverse effects, such as falls, cognitive impairment and constipation, and should be monitored for such. Decreased renal function associated with aging leads to decreased clearance of the drug, resulting in narrow therapeutic windows and increasing the danger of overdose. If oxymorphone is absolutely indicated, smaller initial doses should be started for this population.
There is a risk of neonatal withdrawal symptom in the newborn if pregnant women take oxymorphone for a prolonged period. Oxymorphone crosses the placenta and holds risk of birth defects, poor fetal growth, stillbirth, and preterm delivery. Mothers who are physically dependent on oxymorphone during pregnancy may give birth to infants that are also dependent. Due to these severe risks, oxymorphone is highly discouraged among this population. The amount of transfer of oxymorphone into the breast milk is not known and women are cautioned to weigh the risks and benefits before breastfeeding while on this medication.
The principal adverse effects of oxymorphone are similar to other opioids with constipation, nausea, vomiting, dizziness, dry mouth and drowsiness being the most common adverse effects. This drug is highly addictive as with other opioids and can lead to chemical dependence and withdrawal.
In common with other opioids, oxymorphone overdosage is characterized by respiratory depression, sleepiness progressing to stupor or coma, skeletal muscle weakness, cold and clammy skin, and sometimes slow heart rate and low blood pressure. In a severe case of overdose, apnea, circulatory collapse, cardiac arrest and death can occur.
Oxymorphone elicits its effects by binding to and activating the μ-opioid receptor (MOR) and, to a much lesser extent, the δ-opioid receptor (DOR) and κ-opioid receptor (KOR). Its activity at the DOR may augment its action at the MOR. Oxymorphone is 10 times more potent than morphine.
|0.78 nM||50 nM||137 nM||1:64:176|
Oxymorphone is commercially produced from thebaine, which is a minor constituent of the opium poppy (Papaver somniferum) but thebaine is found in greater abundance (3%) in the roots of the oriental poppy (Papaver orientale). German patents from the mid-1930s indicate that oxymorphone as well as hydromorphone, hydrocodone, oxycodone, and acetylmorphone can be prepared—without the need for hydrogen gas—from solutions of codeine, morphine, and dionine by refluxing an acidic aqueous solution, or the precursor drug dissolved in ethanol, in the presence of Column 7 metals[further explanation needed], namely palladium and platinum in fine powder or colloidal form or platinum black. It is unclear if aluminium or nickel can be used as a catalyst in these reactions.
Oxymorphone hydrochloride occurs as odourless white crystals or white to off-white powder. It darkens in colour with prolonged exposure to light. One gram of oxymorphone hydrochloride is soluble in 4 ml of water and it is sparingly soluble in alcohol and ether. It degrades upon contact with light.
Oxymorphone can be acetylated like morphine, hydromorphone, and some other opioids. Mono-, di-, tri-, and tetra- esters of oxymorphone were developed in the 1930s but are not used in medicine at this time. Presumably other esters such as nicotinyl, benzoyl, formyl, cinnimoyl &c.can be produced.
The 2013 US DEA annual manufacturing quotas were 18 375 kilogrammes for conversion (a number of drugs can be made from oxymorphone, both painkillers and opioid antagonists like naloxone) and 6875 kg for direct manufacture of end-products. Oxymorphone is also a minor metabolite of oxycodone, which is formed by CYP2D6-mediated O-demethylation.
Oxymorphone was first developed in Germany in 1914, and patented in the USA by Endo Pharmaceuticals in 1955. It was introduced in the United States in January 1959 and other countries around the same time.
Society and culture
- Numorphan (suppository and injectable solution)
- Opana ER (extended-release tablet): June 2017 FDA removal request due to rates of IV abuse.
- Opana IR (immediate-release tablet)
- O-Morphon in Bangladesh by Ziska pharmaceutical ltd.
The brand name Numorphan is derived by analogy to the Nucodan name for an oxycodone product (or vice versa) as well as Paramorphan/Paramorfan for dihydromorphine and Paracodin (dihydrocodeine). The only commercially available salt of oxymorphone in most of the world at this time is the hydrochloride, which has a free base conversion ratio of 0.891, and oxymorphone hydrochloride monohydrate has a factor of 0.85.
Generic pill markings are ATV10/APO; HK10 (10 mgs) oblong white and ATV20/APO; HK20 (20mgs) oblong white.
In the past 30 years, opioid drug abuse has been a prevalent public health issue. In more recent years, this issue has developed into a full-fledged epidemic and is leading to several other public health issues, including the spread of diseases like hepatitis C and human immunodeficiency virus (HIV). 
In the United States, as of 2013 more than 12 million people abused opioid drugs at least once a year. In 2010, 16,652 deaths were related to opiate overdose, in 2015 this number increased to 33,091. In September 2013, new FDA labeling guidelines for long-acting and extended-release opioids required manufacturers to remove moderate pain as use indication, reserving the drug for "pain severe enough to require daily, around-the-clock, long-term opioid treatment" however it did not restrict physicians from prescribing opioids for moderate, "as needed" usage.
In January 2013, the Centers for Disease Control and Prevention reported an illness associated with intravenous (IV) abuse of oral Opana ER (oxymorphone) in Tennessee. The syndrome resembled that of thrombotic thrombocytopenic purpura (TTP). Initial therapy included therapeutic plasma exchange, as for TTP. Unlike TTP, no deficient ADAMTS13 activity nor anti-ADAMTS13 antibody was found indicating a thrombotic microangiopathy of different underlying cause. If IV Opana abuse is acknowledged, supportive care, instead of therapeutic plasma exchange could be considered.
In late March 2015, reports indicated Austin, Indiana, was the center of an outbreak of HIV caused by oxymorphone use as an injectable recreational drug. The outbreak required emergency action by state officials. The NPR podcast "embedded" episode of March 31, 2016 was an in-depth account of a visit to oxymorphone abusers in Austin, Indiana. The current street price of oxymorphone was reported to be $140.
In January 2015, the first HIV outbreak linked to abuse of prescription opioid drugs was identified by the Indiana State Department of Health (ISDH), in the small, rural community of Scott County in southeastern Indiana. ISDH launched an investigation into this HIV outbreak when 11 individuals were confirmed positive for HIV with ties tracing back to the same community. Three months into this investigation, ISDH diagnosed a total of 135 people with HIV, with the numbers still increasing. The cause of this outbreak has been linked to the sharing of needles between opioid abusers, which in some cases, involves sharing needles with up to nine different partners.
The common opioid of abuse in this outbreak has been identified as Opana ER, a time-released oxymorphone pain killer formulated to be resistant to crushing, manufactured by Endo Pharmaceuticals. This harder to crush formulation was put into production in 2012 in an effort to reduce the risk of abuse from snorting the crushed up pill. However, opioid abusers circumvented this issue by finding a way to dissolve and inject the drug.
The extent of this outbreak has garnered the attention of both the CDC and FDA. The CDC opened a larger investigation into all disease outbreaks involving Opana ER, focusing on the incidence of thrombotic thrombocytopenic purpura (TTP)-like illness in the 2012 Tennessee outbreak, as well as the 2015 HIV outbreak in Indiana. The FDA launched a post-marketing safety study regarding the reformulation of Opana ER in 2012 and the Indiana state government helped fund another study exploring the link between HIV infection and injection use of oxymorphone in Indiana from 2014 to 2015.
The results of these studies found that the reformulation of Opana to a hard to crush tablet unintentionally increased the risk of transmission of acquired blood borne infections because opioid abusers switched from using the drug through the nasal route to injection. The the case of Indiana's HIV outbreak in 2015, the risk of acquiring a blood borne infection with the use of injectable opioids was greater than the risk when using injectable heroin or cocaine.
In June 2017, faced with the public health crisis, the opioid epidemic, the FDA asked Endo Pharmaceuticals to "remove its opioid pain medication, reformulated Opana ER (oxymorphone hydrochloride), from the market". In their June 8, 2017 press release they also noted that, this was the first time the FDA had taken steps to "remove a currently marketed opioid pain medication from sale due to public health consequences of abuse." By July 6, 2017, Endo International voluntarily complied with the FDA removal request.
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Today, the U.S. Food and Drug Administration requested that Endo Pharmaceuticals remove its opioid pain medication, reformulated Opana ER (oxymorphone hydrochloride), from the market... This is the first time the agency has taken steps to remove a currently marketed opioid pain medication from sale due to the public health consequences of abuse...[FDA Commissioner Scott Gottlieb, M.D.]: "We are facing an opioid epidemic – a public health crisis, and we must take all necessary steps to reduce the scope of opioid misuse and abuse.
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