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Opioids are commonly prescribed to patients to help manage pain. However, opioid therapy can also cause neuroexcitatory side effects, including myoclonus, which is the uncontrollable twitching and jerking of muscles or muscle groups. This phenomenon is not well understood by medical professionals, but it is believed that opioids may activate NMDA receptors and disrupt neural pathways near the brain or spine. Myoclonus typically occurs during or after drug usage and can be a sign of opioid abuse. It is often preceded by long periods of nocturnal myoclonus and can be constant jerking of random muscle groups in all extremities.
| Characteristics | Values |
|---|---|
| Clinical term for uncontrollable muscle movement | Myoclonus |
| Occurrence of myoclonus | Occurs in one or a few areas of the body or full-body twitching |
| Occurrence with opioids | Occurs with opioids including morphine, hydromorphone, fentanyl, meperidine, and sufentanil |
| Occurrence with dosage | Occurs with higher doses more frequently, but the dose relationship is variable |
| Occurrence with route of administration | Occurs with all routes of administration |
| Cause | Likely caused by 3-glucuronide opioid metabolites |
| Cause | Opioids' tendency to activate NMDA receptors and disrupt neural pathways near the brain or spine |
| Cause | Neuroexcitatory opioid metabolite accumulation |
| Neurotoxicity co-morbid factors | Renal failure, electrolyte disturbances, and dehydration |
| Neurotoxicity prognosis | Longer prognosis demands a more definitive change in treatment |
| Treatment | Reduction of opioid dosage and/or administration of clonazepam therapy |
| Treatment | Opioid dose reduction or opioid switching |
| Treatment | Adjuvant drugs such as benzodiazepines or dantrolene |
| Treatment | Methadone, buprenorphine, and naloxone |
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What You'll Learn
Opioid-induced myoclonus
The muscle spasms brought on by opioid use are not yet well understood by medical professionals, but they are believed to be caused by opioids' tendency to activate NMDA receptors and disrupt neural pathways near the brain or spine. This disruption can lead to an excessive release of dopamine, causing an intense feeling of euphoria. Myoclonus can also be caused by other factors such as chronic alcohol abuse, alcohol withdrawal, and the use of other drugs such as barbiturates, antidepressants, and diuretics.
The management of opioid-induced myoclonus includes reducing the opioid dosage and/or administering clonazepam therapy. However, there is currently no definitive treatment or avoidance strategy for myoclonus. Recognising the symptoms of opioid-induced myoclonus is crucial, as it is an under-recognised symptom of opioid abuse and can be a first step towards recovery.
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Opioid toxicity
Opioids are synthesized through chemical processes and include methadone, oxycodone, and fentanyl. They are widely used for pain relief and have been approved for analgesia for nearly 70 years. However, concerns have been raised about their safety, with an increase in opioid overdoses and toxicity cases. Opioid toxicity can occur due to impaired renal function, leading to toxic effects from accumulated drugs or active metabolites. Additionally, individuals with liver disease may experience opioid toxicity due to impaired hepatic metabolism, resulting in drug accumulation.
Opioid-induced muscle hyperactivity, or myoclonus, is an adverse effect of chronic opioid therapy. Myoclonus is characterized by involuntary twitching and jerking of muscles or muscle groups, typically starting with occasional random movements. As myoclonus worsens, patients may experience hyperalgesia (increased sensitivity to pain), delirium with hallucinations, and eventually grand mal seizures. Clinicians should be aware of the neuroexcitatory effects of opioids, which may include myoclonus as a typical herald symptom.
When identifying a patient with possible opioid toxicity, clinicians should conduct a chart review and physical examination, including laboratory studies to check renal and liver function, magnesium levels, glucose, and sodium levels. Opioid reversal agents such as naloxone can be used to rapidly reverse an opioid overdose and reduce morbidity and mortality. Naloxone can be administered through a nasal spray or injection and is widely accessible to both medical professionals and community members in some states.
To manage opioid-induced muscle hyperactivity, a reduction in opioid dosage and/or administration of clonazepam therapy may be recommended. It is important to recognize that opioid toxicity can occur unintentionally, as patients may be attempting to manage unrelenting pain. Healthcare professionals should be proficient in evaluating and managing opioid toxicity, including implementing individualized combinations of pharmacological and non-pharmacological treatments.
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Opioid abuse
Myoclonus is believed to be caused by opioids' tendency to activate NMDA receptors and disrupt neural pathways near the brain or spine. It is also thought to be dose-related in an unpredictable manner. The incidence of opioid-related myoclonus varies widely, ranging from 2.7% to 87%. It usually occurs during or after drug usage and can start with occasional random jerking movements. As myoclonus worsens, patients may develop other neuroexcitatory signs such as hyperalgesia (increased sensitivity to pain), delirium with hallucinations, and eventually grand mal seizures.
Opioid-induced muscle hyperactivity has been documented as an adverse effect of chronic opioid therapy. It is recommended that the opioid dosage be reduced or that clonazepam therapy be administered to manage this side effect. Other management options include opioid switching, and treating and withdrawing drugs that are causing reversible metabolic derangements or drug-induced neuromuscular disorders.
Recognizing the symptoms of opioid addiction is the first step to recovery. If you or someone you know is struggling with opioid abuse and experiencing myoclonus or other unwanted side effects, it is important to seek help from a medical professional or an addiction treatment service.
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Opioid-induced hyperalgesia
Opioids are commonly used to treat pain, but they can also cause a state of nociceptive sensitization known as opioid-induced hyperalgesia (OIH). OIH is characterised by a paradoxical response in which patients receiving opioids for pain management become more sensitive to certain painful stimuli. While the exact mechanisms of OIH are not yet fully understood, it is known that certain kinds of opioids with a direct effect on the opioid receptor, known as "agonists", are more likely to produce hyperalgesia. These include commonly prescribed opioid pain medications such as oxycodone, hydrocodone, morphine, hydromorphone, and fentanyl.
OIH can be challenging to identify, as the symptoms can be subtle and may develop slowly over time. It may manifest as a tolerance to the effects of the opioid, requiring higher doses to achieve the same level of pain relief. Additionally, the pain from the original injury may not improve or may even worsen. Other areas of the body that were previously pain-free may become painful, including old injuries that the patient had already recovered from.
The clinical management of OIH primarily involves tapering off the opioid medication when possible. During a period of abstinence, the brain changes induced by the medication typically resolve. Non-opioid pain medications, such as acetaminophen, non-steroidal anti-inflammatory drugs, or anticonvulsants, can be safely used as alternatives during this time. It is crucial for patients taking opioid pain medications to discuss the possibility of OIH with their doctors and not to make abrupt changes to their medication regimen without medical guidance.
While the prevalence of OIH is not well understood, it is a significant concern as the prescription of opioids, particularly for chronic non-malignant pain, becomes more common. OIH may contribute to the loss of opioid efficacy in some patients and can lead to a cycle of increasing opioid doses and worsening pain. Therefore, it is essential to raise awareness of OIH among clinicians and patients to facilitate early recognition and appropriate management.
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Opioid interference with the nervous system
Opioids are widely recognised as a prescription medication for pain relief. However, they can also cause opioid-induced involuntary muscle hyperactivity, known as myoclonus. Myoclonus is the involuntary twitching of a muscle or group of muscles, usually starting with occasional random jerking movements in the extremities. As myoclonus worsens, patients may develop other neuroexcitatory signs such as hyperalgesia (increased sensitivity to noxious stimuli), delirium with hallucinations, and eventually grand mal seizures.
Opioids mediate their effects via opioid receptors in the central nervous system: mu, delta, and kappa. These receptors are generally inhibitory, reducing neurotransmitter release and hyperpolarising neurons. However, the overactivity of these receptors can lead to muscle twitching. Opioid-induced myoclonus is a recognised side effect of opioid therapy, particularly in patients on chronic opioids.
The underlying mechanisms of opioid-induced myoclonus are not yet fully understood. Current research implicates 3-glucuronide opioid metabolites as one likely cause of neuroexcitatory side effects. The symptoms may not develop until a neurotoxic threshold is surpassed, and co-morbid factors for neurotoxicity include renal failure, electrolyte disturbances, and dehydration.
If a patient presents with opioid-induced myoclonus, the recommended course of action is to reduce the opioid dosage and/or administer clonazepam therapy. It is important to note that any involuntary muscle movement should be discussed with a doctor.
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Frequently asked questions
Opioid-induced involuntary muscle hyperactivity has been documented as an adverse effect of chronic opioid therapy. Opioids can cause myoclonus, which is characterised by uncontrollable twitching and jerking of various muscle groups, most frequently in the extremities.
Scientists believe muscle twitching after opioid use may be caused by opioids' tendency to activate NMDA receptors and disrupt neural pathways near the brain or spine.
Common opioid side effects include constipation, nausea, pruritus, and urinary retention. Less common adverse effects include sedation, vomiting, respiratory depression, hyperalgesia, and delirium with hallucinations.
If you are experiencing muscle twitching due to opioid use, it is important to seek medical help. Recognising the symptoms of opioid addiction is the first step to recovery. Management options for opioid-induced myoclonus include opioid dose reduction, opioid switching, or administration of clonazepam therapy.
