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Restless leg syndrome (RLS) is a sleep disorder that causes an urge to move the legs, typically in the evening or at night. The urge to move is usually caused by an uncomfortable feeling in the legs, which can be temporarily relieved by moving the legs. While there is usually no known cause for RLS, researchers suspect it may be caused by an imbalance of the brain chemical dopamine, which controls muscle movement. Certain medications, such as antidepressants and anti-nausea drugs, can make RLS symptoms worse. Muscle relaxants are sometimes used to treat RLS, although they are not a traditional treatment. Some muscle relaxers used to treat RLS include flexeril, tizanidine, and baclofen.
| Characteristics | Values |
|---|---|
| Muscle relaxers used to treat RLS | Flexeril, Tizanidine, Baclofen, Cyclobenzaprine |
| Other medications used to treat RLS | Gabapentin, opioid analgesics, sleep medications |
| RLS symptoms | Uncomfortable feeling in the legs, compelling unpleasant feelings in the legs or feet, desire to move the legs |
| RLS causes | Imbalance of the brain chemical dopamine, peripheral neuropathy, pregnancy or hormonal changes |
| RLS treatment | Iron supplements, warm baths, massages, warm or cool packs, relaxation techniques, moderate exercise, good sleep habits, medication |
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What You'll Learn
Muscle relaxants are used to treat RLS
Restless legs syndrome (RLS) is a nerve disorder characterised by throbbing, pulling, creeping, or other unpleasant sensations in the legs, and an uncontrollable urge to move them. Symptoms typically start in the evening, progressively worsening throughout the night. While RLS is not always hereditary, it does run in families, and researchers have identified a genetic basis for the condition.
RLS can be caused by underlying medical conditions such as anaemia, diabetes, nutritional deficiencies, kidney disease, thyroid disease, varicose veins, or Parkinson's disease. Treatment for RLS usually focuses on relieving these symptoms and identifying and treating any underlying conditions. Doctors may recommend dietary supplements to correct iron, vitamin, or mineral deficiencies, as well as physical therapy and self-care treatments, such as stretching, taking hot or cold baths, whirlpool baths, applying hot or cold packs, limb massage, or vibratory or electrical stimulation of the feet and toes before bedtime. Exercise, relaxation techniques, and establishing good sleep habits can also help manage RLS.
If lifestyle changes are insufficient, doctors may prescribe medications that affect dopamine, a chemical in the brain that controls muscle movement. Dopamine agonists, such as pramipexole (Mirapex), rotigotine (Neupro), and ropinirole (Requip), are often the first medicines used to treat RLS. Other dopaminergic agents, such as Sinemet, increase dopamine levels in the brain and may improve leg sensations in RLS, although they can worsen symptoms for some individuals. Benzodiazepines, such as alprazolam (Xanax) and clonazepam (Klonopin), are sedatives that help individuals sleep through RLS symptoms rather than relieving them. Opioid analgesics and muscle relaxants are also sometimes used to combat RLS symptoms.
Muscle relaxants are a class of drugs that act centrally to reduce muscle stiffness and pain. Cyclobenzaprine is a commonly prescribed muscle relaxant with tricyclic properties. While generally well-tolerated, it can cause side effects such as serotonin syndrome, especially when combined with antidepressants or opiates. In one reported case, a patient experienced delirium and hyperkinetic movement disorders shortly after initiating treatment with cyclobenzaprine and oxycodone, but the symptoms resolved within 48 hours of discontinuing the drug.
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RLS is a sleep disorder
Restless Legs Syndrome (RLS) is a movement disorder that affects 3% to 15% of the general population. It is characterised by an irresistible urge to move the legs, often accompanied by uncomfortable feelings of "pulling, searing, drawing, tingling, bubbling, or crawling" beneath the skin, usually in the calf area. These sensations are aggravated by rest and relieved by movement. RLS can severely interrupt sleep, making it difficult to fall asleep or return to sleep after waking up. Leg movement or walking typically provides temporary relief from the discomfort, but the sensations often return as soon as movement ceases.
RLS episodes usually occur between 10 p.m. and 4 a.m., with symptoms often worsening shortly after midnight and disappearing by morning. If the condition becomes more severe, symptoms may begin to occur during the day, but the problem is always worse at night. Disturbed nighttime sleep due to unpleasant sensations and a strong urge to move the legs can lead to excessive daytime tiredness. RLS can be either early-onset, which tends to have a family history, or late-onset.
Most people with RLS also experience Periodic Limb Movement Disorder (PLMD), a condition where leg muscles contract and jerk every 20 to 40 seconds during sleep. These movements may last from less than a second up to 10 seconds. Unlike RLS, contractions in PLMD usually do not wake the person experiencing them, although their bed partner may be disturbed. While treatments for the two conditions are similar, PLMD is a separate syndrome.
There is no cure for RLS, but treatments can help manage the symptoms. Doctors may prescribe medications such as anti-seizure drugs, dopaminergic agents, hypnotics, opioids, non-opioids, antiepileptic drugs, antidepressants, and muscle relaxants. Over-the-counter medicines, lifestyle changes, and iron supplements can also help.
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RLS causes an urge to move the legs
Restless legs syndrome (RLS) is a movement condition that causes a strong urge to move the legs when at rest. This urge can interfere with one's ability to relax or fall asleep. The sensations that accompany RLS are often described as uncomfortable and can include itching, pulling, crawling, throbbing, searing, drawing, tingling, bubbling, or creeping. These sensations usually occur in the legs, but they can also affect the thighs, feet, and sometimes the arms.
The core symptom of RLS is an irresistible urge to move the legs, often accompanied by uncomfortable sensations. These sensations are aggravated by rest and relieved by movement. People with RLS may find temporary relief from discomfort by keeping their legs in motion, but the sensations often return as soon as movement stops. RLS episodes typically occur between 10 pm and 4 am, with symptoms worsening shortly after midnight and disappearing by morning.
In terms of treatment, there is currently no cure for RLS, but various management options are available. These include lifestyle changes, such as taking warm baths, leg massages, applying warm or cool packs, and practising relaxation techniques like yoga or meditation. Regular moderate exercise and establishing good sleep habits can also help alleviate symptoms. Additionally, reducing the consumption of caffeine, alcohol, and tobacco may be beneficial, as these substances can trigger or exacerbate RLS symptoms.
If lifestyle modifications are insufficient, medical professionals may prescribe medications to reduce leg restlessness. Dopaminergic agents, such as carbidopa/levodopa, can be prescribed, although long-term use may worsen symptoms. Anti-seizure medications like gabapentin enacarbil or pregabalin are also effective for moderate to severe RLS. Furthermore, the FDA has recently approved a new technology called Tonic Motor Activation (TOMAC), which involves devices worn on the lower legs to activate muscles and mimic the sensation of movement, thereby reducing RLS-related discomfort and improving sleep quality.
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RLS is associated with periodic limb movement during sleep
Restless leg syndrome (RLS) is a sleep-related movement disorder characterised by an urge to move one or both legs (and sometimes the arms) when immobile. This urge is often associated with discomfort in the affected limbs and is usually relieved by movement. RLS is more prominent in the evening or at night and can make extended immobility nearly impossible, leading to insomnia. Once asleep, people with RLS often experience periodic limb movements during sleep (PLMS).
PLMS is a movement disorder that involves repetitive leg and/or arm movements during sleep, which can disrupt sleep quality. It is diagnosed in adults who experience more than 15 limb movements per hour during sleep and in children who experience more than five limb movements per hour. People with PLMS may experience frequent awakenings and problems falling asleep due to these involuntary movements. PLMS is often diagnosed based on an individual's medical history and the results of an overnight sleep study (polysomnogram).
PLMS commonly occurs alongside RLS, and treatments that alleviate RLS symptoms may also help PLMS. Dopaminergic medications, such as pramipexole, ropinirole, rotigotine, and other drugs like gabapentin, pregabalin, and opioid analgesics may help reduce periodic limb movements in patients with PLMS. Additionally, muscle relaxants and sleep medications are sometimes used to help manage RLS symptoms.
While muscle relaxants can be used to treat RLS symptoms, it is important to note that certain medications can worsen RLS and PLMS. For example, some antidepressants like mirtazapine, venlafaxine, sertraline, fluoxetine, and amitriptyline may aggravate periodic limb movements. Therefore, it is crucial to consult with a healthcare provider to review current medications and discuss potential substitutes if needed.
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RLS may be caused by a dopamine imbalance
Restless Legs Syndrome (RLS) is a dopamine-dependent disorder characterised by a strong urge to move. Dopamine is a neurotransmitter that plays a crucial role in regulating movement. It triggers nerve impulses that affect muscle movement.
Dopamine imbalances, particularly in the basal ganglia, may underlie RLS symptoms. Dopamine deficiency is reminiscent of conditions like Parkinson's disease, where motor control is similarly impaired. Dopaminergic medications, which increase dopamine activity in the brain, are among the most effective treatments for RLS.
Research suggests that individuals with RLS may have a dopamine imbalance, particularly in the basal ganglia—regions of the brain that control movement. This genetic predisposition may influence how the brain processes dopamine, making individuals more susceptible to RLS. Several studies support the theory that an imbalance in neurotransmitters (chemical messengers in the brain), notably dopamine, may play a part in RLS.
Additionally, iron deficiency has been linked to RLS in some people. Iron plays a vital role in dopamine production and function. Studies indicate that individuals with low iron levels, even if not anaemic, are at a heightened risk for RLS. Other nutritional deficiencies, such as vitamin B12 and magnesium, have also been associated with RLS.
In summary, RLS may be caused by a dopamine imbalance, which can be influenced by genetic factors and nutritional deficiencies. Dopaminergic medications that increase dopamine activity in the brain are effective treatments for RLS. Additionally, addressing nutritional deficiencies, particularly iron deficiency, can help manage RLS symptoms.
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Frequently asked questions
Restless leg syndrome (RLS) is a condition that causes a strong urge to move the legs due to an uncomfortable feeling. It typically occurs in the evening or at night and can disrupt sleep.
There are various treatments for RLS, including lifestyle changes such as warm baths, leg massages, and regular moderate exercise. Doctors may also prescribe medications that affect dopamine, a brain chemical involved in muscle movement.
While muscle relaxants are sometimes used to treat RLS, they are not a traditional treatment. Some people have reported trying muscle relaxers like flexeril, tizanidine, and baclofen for RLS with varying levels of success. However, it's important to consult a doctor before taking any medication.
