Logan Steele
Antipsychotics are drugs used to treat and manage symptoms of many psychiatric conditions, including schizophrenia, psychotic episodes, bipolar disorder, and major depressive disorder. They work by interfering with the brain chemical dopamine, which is important in controlling movement. As a result, antipsychotics may cause movement disorders, including muscle rigidity. This is most common with first-generation (older) antipsychotics and less likely with newer, second-generation antipsychotics. Neuroleptic malignant syndrome (NMS) is a rare and life-threatening reaction to antipsychotics, causing muscle rigidity, high fever, and altered mental status, among other symptoms. Other movement disorders associated with antipsychotics include tardive dyskinesia, dystonia, and parkinsonism.
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What You'll Learn
Neuroleptic malignant syndrome (NMS)
NMS typically presents with "lead pipe rigidity", where the muscles are stiffened and resistance is observed throughout the range of motion. Severe cases may present as catatonia, in which the person is non-responsive to stimuli. The deep tendon reflexes in NMS are usually preserved. The raised white blood cell count and creatine phosphokinase (CPK) plasma concentration seen in NMS are due to increased muscular activity and rhabdomyolysis (destruction of muscle tissue). NMS may also be accompanied by hypertensive crisis, metabolic acidosis, and malignant hyperthermia.
NMS is a medical emergency with a high mortality rate of between 10-20%. It requires immediate treatment, which involves discontinuing the offending agent, providing aggressive supportive care to manage and prevent complications, and pharmacologic therapy in severe cases. Empiric medications frequently used for refractory NMS include bromocriptine mesylate, a dopamine agonist, and dantrolene sodium, a muscle relaxant. Other treatments may include Parkinson's disease drugs like amantadine, which increase dopamine production, and benzodiazepines, which have muscle relaxant properties.
NMS can be difficult to differentiate from other neurological disorders, such as serotonin syndrome, encephalitis, toxic encephalopathy, status epilepticus, heat stroke, and catatonia. However, features that distinguish NMS include bradykinesia, muscle rigidity, and a high white blood cell count. It is important to seek medical help immediately if you notice any symptoms of NMS, as delays in treatment can be harmful and even fatal.
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Antipsychotic-induced movement disorders
Antipsychotics are a class of drugs used to treat serious mental illnesses like schizophrenia and bipolar disorder. They are also used to treat psychotic episodes. Antipsychotics interfere with the brain chemical dopamine, which is important for controlling movement. Therefore, antipsychotics may cause movement disorders, which are most common with first-generation antipsychotics and less likely with newer antipsychotics.
The most common movement disorders associated with antipsychotics are drug-induced parkinsonism (DIP) and tardive dyskinesia (TD). DIP usually starts within days to months of beginning antipsychotic treatment, whereas TD may begin months or years later. The signs of DIP include tremors and slow, stiff movements, while TD is characterised by facial movements such as lip puckering, smacking, and chewing. These side effects can be permanent and are often embarrassing for the patient, interfering with their daily activities.
Other movement disorders associated with antipsychotics include dystonia, akathisia, and neuroleptic malignant syndrome (NMS). Dystonia involves involuntary muscle contractions, which can lead to twisting and distorted postures. It is most common in younger adults and children, and the muscle stiffness and postural distortions can be painful and frightening. Akathisia, or motor restlessness, is often mistaken for anxiety or psychosis exacerbation and can induce suicidality. NMS is an abrupt, rare, and life-threatening response to a therapeutic dose of an antipsychotic, with symptoms including exhaustion, agitation, high fever, mental status change, muscle rigidity, and autonomic dysregulation.
The treatment of choice for antipsychotic-induced movement disorders is to lower the dosage of the antipsychotic. However, this may not be clinically feasible in many acutely ill psychiatric patients. Anticholinergic agents, benzodiazepines, and beta-blockers have been used to treat these disorders, but their efficacy is inconsistent.
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First-generation vs. second-generation antipsychotics
Antipsychotic medications are commonly categorized into two classes: first-generation antipsychotics (FGAs) and second-generation antipsychotics (SGAs). First-generation antipsychotics, also known as typical antipsychotics, were developed in the 1950s and are dopamine receptor antagonists. Second-generation antipsychotics, also known as atypical antipsychotics, emerged in the 1980s and are serotonin-dopamine antagonists.
First-generation antipsychotics are effective in treating the positive symptoms of schizophrenia, such as hallucinations and delusions, as well as acute mania with psychotic symptoms. They are also used to treat severe agitation and irritability, and are recommended for treating agitation in delirium and dementia. However, FGAs tend to affect body movement more than SGAs and can cause movement problems like muscle stiffness, as well as severe neuromuscular side effects. They may also be more likely to cause sexual side effects.
Second-generation antipsychotics treat both the positive and negative symptoms of schizophrenia, such as withdrawal and ambivalence, and are known to reduce relapse rates. They can also be used to treat acute agitation and behavioural disturbances in dementia. While SGAs generally cause fewer movement problems than FGAs, they are associated with more weight gain and cardiometabolic adverse effects. They may also be more likely to cause serious metabolic side effects.
Both first-generation and second-generation antipsychotics can be used to treat symptoms of borderline personality disorder, such as psychosis and paranoia. In terms of cost, antipsychotic medications can range from as low as $5 per month to more than $2,000 per month, with generic options typically being more affordable than name brands.
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Anticholinergic agents as treatment
Antipsychotics are a class of drugs that interfere with the brain chemical dopamine, which is important for controlling movement. They are commonly used to treat schizophrenia, psychotic episodes, bipolar disorder, and major depressive disorder. However, they are associated with movement disorders, including muscle rigidity, which can be life-threatening in rare cases.
Anticholinergic agents are a type of medication that blocks the action of a neurotransmitter called acetylcholine. By inhibiting acetylcholine, anticholinergic drugs prevent involuntary muscle movements and various bodily functions. Anticholinergic drugs are used to treat a wide range of conditions, including asthma, motion sickness, Parkinson's disease, high blood pressure, and gastrointestinal disorders.
In the context of antipsychotic-induced movement disorders, anticholinergic agents can be used as a treatment option. Anticholinergic drugs such as trihexyphenidyl have been prescribed to manage akathisia, a form of subjective motor restlessness associated with antipsychotic use. While anticholinergics can be beneficial, they are not always effective, and the inappropriate use of these drugs can have severe adverse effects.
When treating antipsychotic-induced movement disorders, the first line of treatment is often a benzodiazepine, such as clonazepam. Anticholinergic agents may be added if reducing the dosage or switching to a lower-potency antipsychotic is not feasible or effective. However, the addition of anticholinergic agents may not always alleviate the movement disorders, and other treatment options, such as beta-adrenergic blockers or propranolol, may be explored.
It is important to note that the treatment approach may vary depending on the specific antipsychotic drug, the patient's medical history, and the severity of the movement disorder. While anticholinergic agents can be a valuable tool in managing antipsychotic-induced muscle rigidity, they should be prescribed with caution, considering the potential side effects and risks associated with their use.
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Beta-blockers as treatment
Antipsychotics are a class of drugs used to treat psychotic episodes, schizophrenia, and other conditions. They work by interfering with the brain chemical dopamine, which is essential for controlling movement. As a result, antipsychotics may cause movement disorders, including muscle rigidity.
Neuroleptic malignant syndrome (NMS) is a rare but life-threatening response to antipsychotics, characterised by muscle rigidity, high temperature, agitation, and other symptoms. If left untreated, NMS can be fatal. Treatment for NMS involves hospitalisation, discontinuation of the offending antipsychotic, and fever reduction.
Antipsychotic-induced movement disorders can also include dystonia, oculogyric crisis, and parkinsonism. While these disorders are less common with second-generation antipsychotics, they can still affect vulnerable populations, such as the elderly, adolescents, and children.
Beta-blockers are a class of medications primarily used to treat cardiovascular conditions. They work by slowing down certain types of cell activity and blocking the action of stress hormones like adrenaline and noradrenaline. This helps to slow the heart rate, relax the blood vessels, and lower blood pressure. Beta-blockers are particularly effective in treating cardiovascular problems and improving longevity and quality of life.
In the context of antipsychotic-induced movement disorders, beta-blockers can be used as a clinical strategy to manage symptoms. Specifically, beta-blockers can help to relax smooth muscle tissue and reduce muscle rigidity. Propranolol, a type of beta-blocker, has been found to be effective in treating movement disorders, with a typical dosage of 30-80 mg per day. However, beta-blockers may also contribute to muscle fatigue and impaired exercise performance as a side effect. Therefore, it is crucial to consult a doctor before using beta-blockers and to follow their instructions carefully.
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Frequently asked questions
NMS is a rare and life-threatening reaction to the use of almost any kind of neuroleptic (antipsychotic) medication. Symptoms include high fever, muscle rigidity, irregular heartbeat, and altered mental status. If you think you are experiencing NMS, seek medical attention immediately.
Antipsychotics may cause movement disorders, especially first-generation (older) antipsychotics. These disorders include akathisia, dystonia, parkinsonism, and tardive dyskinesia. Parkinsonism symptoms include muscle stiffness and weakness, difficulty with facial expressions and small movements, and a slow tremor.
Treatment for antipsychotic-induced movement disorders involves lowering the dosage of the antipsychotic or switching to a newer, second-generation antipsychotic. Anticholinergic agents and benzodiazepines may also be used to treat specific disorders.
Antipsychotics may cause oculogyric crisis, which affects the muscles that control eye movements, leading to sudden, uncontrollable eye turning. They can also cause degeneration of the retina and narrow-angle glaucoma, which is a medical emergency. If you've had eye problems, use antipsychotics with caution.
