Chemistry:Opioid withdrawal

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Short description: Withdrawal symptoms of opiates
Suboxone tablet (Buprenorphine/naloxone) delivers the opioid drug through a sublingual route, giving fast onset of effects.

Opioid withdrawal is a set of symptoms (a syndrome) arising from the sudden withdrawal or reduction of opioids where previous usage has been heavy and prolonged.[1][2] Signs and symptoms of withdrawal can include drug craving, anxiety, restless legs, nausea, vomiting, diarrhea, sweating, and an increased heart rate. Opioid use triggers a rapid adaptation in cellular signalling pathways that means, when rapidly withdrawn, there can be adverse physiological effects. All opioids, both recreational drugs and medications, when reduced or stopped, can lead to opioid withdrawal symptoms. When withdrawal symptoms are due to recreational opioid use, the term opioid use disorder is used, whereas when due to prescribed medications, the term prescription opioid use disorder is used.[3] Opioid withdrawal can be helped by the use of opioid replacement therapy, and symptoms may be relieved by the use of medications including lofexidine and clonidine.[4]

Signs and symptoms

Withdrawal from any opioid produces similar signs and symptoms. However, the severity and duration of withdrawal depend on the type and dose of opioid taken and the duration and frequency of use.[5]

The symptoms of opioid withdrawal may develop within minutes or up to several days following reduction or stopping.[1] Symptoms can include: extreme anxiety, nausea or vomiting, muscle aches, a runny nose, sneezing, diarrhea, sweating and fever.[1]

Pathophysiology

Repeated dosages of opioids can quickly lead to tolerance and physical dependence. This is due to the marked decrease in opioid receptor sensitivity caused by long-term receptor stimulation triggering receptor desensitisation (in this case receptor internalisation).[2] Tolerance causes a decrease in opioid sensitivity, impairing the efficacy of endogenous (our own body's) opioid molecules that function in multiple brain regions. Opioids partially signal through the decrease in cellular cAMP. Cells with decreased cAMP adapt to regulate cAMP and increase production. In the tolerant brain the sudden withdrawal of opioids coupled with the reduced sensitivity to inhibitory signals from the endogenous opioid systems can cause abnormally high levels of cAMP that may be responsible for withdrawal behaviours.[5] Similar changes may also be responsible for the peripheral gastrointestinal effects such as diarrhea, as there is a reversal of the effect on gastrointestinal motility.[6]

Due to the difference in lipophilicity and mode of release between opioid analgesics, the severity, and duration of withdrawal symptoms may differ.

The followings are the general descriptions of duration of opioid withdrawal symptoms:[7]

  • High intake for a long duration (> 6 Months) is associated with a more severe level of withdrawal symptoms.
  • Short-acting or slow-release opioids result in more rapid onset and shorter duration of withdrawal symptoms.
  • Longer-acting opioids result in slower onset but longer duration of withdrawal symptoms.

Diagnosis

The diagnosis of opioid withdrawal requires recent use or exposure to opioids and symptoms consistent with the disorder.[8] The severity of symptoms can be assessed by validated withdrawal scales, such as the Clinical Opiate Withdrawal Scale (COWS).[9]

Treatment and management

Treatment for opioid withdrawal is based on underlying diagnostic features. A person with an acute opioid withdrawal but no underlying opioid use disorder can be managed by slowly reducing opioids and treatments aimed at the symptoms.[2]

Acute withdrawal

Alpha 2 adrenergic agonists

A major feature of opioid withdrawal is exacerbated noradrenaline release in the locus coeruleus. Alpha 2 adrenergic agonists can be used to manage the symptoms of acute withdrawal. Lofexidine and clonidine are also used for this purpose; both are considered to be equally effective, though clonidine has more side effects than lofexidine.[10]

GABA analogues

While some studies indicate that gabapentin does not significantly reduce the symptoms of opiate withdrawal, there is increasing evidence that gabapentinoids are effective in controlling some of the symptoms during opiate detoxification. Pregabalin, another GABA analogue, was more effective than clonidine in reducing opiate withdrawal symptoms.[11]

Withdrawal in opioid use disorder

The treatment of withdrawal in people with opioid use disorder also relies on symptomatic management and tapering with medications that replace typical opioids, including buprenorphine and methadone. The principle of managing the syndrome is to allow the concentration of drugs in blood to fall to near zero and reverse physiological adaptation. This allows the body to adapt to the absence of drugs to reduce the withdrawal symptoms. The most commonly used strategy is to offer opioid drug users long-acting opioid drugs and slowly taper the dose of the drug. Methadone, buprenorphine-­naloxone, and naltrexone are all commonly used medications for opioid use disorder.[12]

A review of UK hospital policies found that local guidelines delayed access to substitute opioids. For instance, requiring lab tests to demonstrate recent use or input from specialist drug teams before prescribing. A lack of access to these substitutes may increase the risk of people discharging themselves early against medical advice.[13][14]

Buprenorphine patches can deliver the opioid drug via a transdermal route, with long-lasting effects.

Dangerous or ineffective treatments

The expense of opioid replacement treatments in some countries has led some people to try treatments with limited evidence. At high doses, loperamide has been reported by some drug users to alleviate opioid withdrawal syndrome.[15] The doses reported in the literature are associated with a high risk of damage to the heart.[16]

Neonatal opioid withdrawal

Many thousands of newborns each year are affected by being exposed to opioids during their prenatal development.[17] Maternal use of opioids has become prolific. The use of opioids during pregnancy creates a dependency in the newborn who experiences withdrawal symptoms shown in clinical signs of opioid withdrawal. These signs are grouped as the neonatal opioid withdrawal syndrome, also known as the neonatal abstinence syndrome.[17] The central nervous system (CNS), and the autonomic nervous system (ANS) are affected. Common signs associated with the CNS are high-pitched crying, reduced sleep, tremors, seizures, gastrointestinal dysfunction, and vomiting. Common ANS-associated signs include sweating, hyperthermia, yawning and sneezing, faster breathing rate, and nasal congestion.[17]

See also

Further reading

  • Kosten, T. R., & Baxter, L. E. (2019). Review article: Effective management of opioid withdrawal symptoms: A gateway to opioid dependence treatment. American Journal on Addictions, 28(2), 55–62. doi:10.1111/ajad.12862

References

  1. ↑ 1.0 1.1 1.2 Diagnostic and statistical manual of mental disorders : DSM-5. (5th ed.). American Psychiatric Association. 2013. pp. 547–549. ISBN 9780890425541. 
  2. ↑ 2.0 2.1 2.2 Volkow, Nora D.; Blanco, Carlos (2020-01-02). "Medications for opioid use disorders: clinical and pharmacological considerations" (in en). The Journal of Clinical Investigation 130 (1): 10–13. doi:10.1172/JCI134708. ISSN 0021-9738. PMID 31763992. 
  3. ↑ Blandthorn, J; Leung, L; Loke, Y (October 2018). "Prescription opioid use in pregnancy.". The Australian & New Zealand Journal of Obstetrics & Gynaecology 58 (5): 494–498. doi:10.1111/ajo.12823. PMID 29744859. 
  4. ↑ Rehman, Saif Ur; Maqsood, Muhammad Haisum; Bajwa, Hamza; Tameez Ud Din, Asim; Malik, Mustafa N (2019). "Clinical Efficacy and Safety Profile of Lofexidine Hydrochloride in Treating Opioid Withdrawal Symptoms: A Review of Literature". Cureus 11 (6): e4827. doi:10.7759/cureus.4827. ISSN 2168-8184. PMID 31403015. 
  5. ↑ 5.0 5.1 Christie, M J (May 2008). "Cellular neuroadaptations to chronic opioids: tolerance, withdrawal and addiction". British Journal of Pharmacology 154 (2): 384–396. doi:10.1038/bjp.2008.100. ISSN 0007-1188. PMID 18414400. 
  6. ↑ Thomas, Jay (2008-01-01). "Opioid-Induced Bowel Dysfunction" (in en). Journal of Pain and Symptom Management 35 (1): 103–113. doi:10.1016/j.jpainsymman.2007.01.017. ISSN 0885-3924. PMID 17981003. 
  7. ↑ "Opioid withdrawal management: SA Health". https://www.sahealth.sa.gov.au/wps/wcm/connect/public+content/sa+health+internet/clinical+resources/clinical+topics/substance+misuse+and+dependence/substance+withdrawal+management/opioid+withdrawal+management. 
  8. ↑ Kosten, Thomas R.; Baxter, Louis E. (2019). "Review article: Effective management of opioid withdrawal symptoms: A gateway to opioid dependence treatment" (in en). The American Journal on Addictions 28 (2): 55–62. doi:10.1111/ajad.12862. ISSN 1521-0391. PMID 30701615. 
  9. ↑ "Clinical Opiate Withdrawal Scale". https://www.drugabuse.gov/sites/default/files/files/ClinicalOpiateWithdrawalScale.pdf. 
  10. ↑ Gowing, Linda; Farrell, Michael; Ali, Robert; White, Jason M (2016-05-03). "Alpha 2 -adrenergic agonists for the management of opioid withdrawal". Cochrane Database of Systematic Reviews 2016 (5): CD002024. doi:10.1002/14651858.cd002024.pub5. ISSN 1465-1858. PMID 27140827. 
  11. ↑ Pregabalin for Opiate Withdrawal Syndrome ClinicalTrials.gov ID NCT03017430. 2020-04-07
  12. ↑ Koehl, Jennifer L; Zimmerman, David E; Bridgeman, Patrick J (2019-07-18). "Medications for management of opioid use disorder" (in en). American Journal of Health-System Pharmacy 76 (15): 1097–1103. doi:10.1093/ajhp/zxz105. ISSN 1079-2082. PMID 31361869. https://academic.oup.com/ajhp/article/76/15/1097/5532635. 
  13. ↑ "Many hospital policies create barriers to good management of opioid withdrawal". NIHR Evidence (National Institute for Health and Care Research). 16 November 2022. doi:10.3310/nihrevidence_54639. https://evidence.nihr.ac.uk/alert/many-hospital-policies-create-barriers-to-good-management-of-opioid-withdrawal/. 
  14. ↑ Harris, Magdalena; Holland, Adam; Lewer, Dan; Brown, Michael; Eastwood, Niamh; Sutton, Gary; Sansom, Ben; Cruickshank, Gabby et al. (2022-04-14). "Barriers to management of opioid withdrawal in hospitals in England: a document analysis of hospital policies on the management of substance dependence". BMC Medicine 20 (1): 151. doi:10.1186/s12916-022-02351-y. ISSN 1741-7015. PMID 35418095. 
  15. ↑ Daniulaityte, Raminta; Carlson, Robert; Falck, Russel; Cameron, Delroy; Perera, Sujan; Chen, Lu; Sheth, Amit (2013-06-01). ""I Just Wanted to Tell You That Loperamide WILL WORK": A Web-Based Study of Extra-Medical Use of Loperamide". Drug and Alcohol Dependence 130 (1–3): 241–244. doi:10.1016/j.drugalcdep.2012.11.003. ISSN 0376-8716. PMID 23201175. 
  16. ↑ Borron, Stephen W.; Watts, Susan H.; Tull, Jonathan; Baeza, Salvador; Diebold, Stephanie; Barrow, Alison (July 2017). "Intentional Misuse and Abuse of Loperamide: A New Look at a Drug with "Low Abuse Potential"". The Journal of Emergency Medicine 53 (1): 73–84. doi:10.1016/j.jemermed.2017.03.018. ISSN 0736-4679. PMID 28501383. 
  17. ↑ 17.0 17.1 17.2 Piccotti, L; Voigtman, B; Vongsa, R; Nellhaus, EM; Rodriguez, KJ; Davies, TH; Quirk, S (1 May 2019). "Neonatal Opioid Withdrawal Syndrome: A Developmental Care Approach.". Neonatal Network 38 (3): 160–169. doi:10.1891/0730-0832.38.3.160. PMID 31470383. 



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