Health education content. Medically reviewed by Dr. Mitesh Chandarana
Levodopa is the most widely used medicine for the movement symptoms of Parkinson’s disease, and it often works very well. But after some years of treatment, many people notice a new problem: smooth, writhing, or jerky movements that they did not choose to make. These are called levodopa-induced dyskinesia. They are not a sign that Parkinson’s is suddenly worse, and they are not a sign that the medicine has stopped working. They are a recognised complication of long-term treatment, and there are ways to manage them.
What Dyskinesia Looks Like
- Fluid, dance-like or writhing movements of the head, arms, legs, or trunk
- Rapid jerking or restless fidgeting
- Sometimes slower, twisting postures or muscle cramps (dystonia)
- Movements that are irregular and flowing, not rhythmic like a tremor
Many people are not aware of mild dyskinesia, while family members notice it. It is not painful for everyone, but it can be tiring, can interfere with eating, writing, or walking, and can be embarrassing in public.
How Common Is It?
Dyskinesia is common after long-term levodopa treatment. In some studies, about half of people with Parkinson’s develop it within roughly five years of starting levodopa, although the timing varies widely from person to person. It tends to be more likely with younger age at onset, longer treatment, and higher doses.
Why It Happens
In a healthy brain, dopamine is released steadily. In Parkinson’s, the cells that store and release dopamine are lost over time, so the brain depends increasingly on each tablet of levodopa. Levodopa levels in the blood and brain then rise and fall with each dose. Over years, the parts of the brain that respond to dopamine, particularly in the basal ganglia, can become over-sensitive to these peaks and swings. Research suggests that in people who develop dyskinesia, key movement areas respond too strongly to levodopa, and the brain’s networks fail to suppress unwanted movements.
In simple terms: the problem is less about the medicine itself and more about uneven delivery of dopamine to a brain that has lost its ability to buffer it.
Types of Dyskinesia
| Type | When it happens | Typical features |
|---|---|---|
| Peak-dose dyskinesia | When the levodopa level is highest, usually an hour or two after a dose | The most common type. Flowing, writhing movements, often of the head, trunk, and limbs |
| Diphasic dyskinesia | As the dose starts to work and again as it wears off | Often involves the legs, with more repetitive, stereotyped movements |
| Off-period dystonia | When levodopa has worn off, for example early in the morning | Painful cramping or twisting, often of the foot or toes. Not a dopamine “excess” but a related problem |
Dyskinesia, Tremor, or Wearing-Off?
These can be confused, but the timing helps:
- Dyskinesia usually appears when the medicine is working, and the movements are irregular and flowing.
- Parkinson’s tremor is typically rhythmic, often present at rest, and more likely when the medicine is wearing off.
- Wearing-off brings stiffness, slowness, or other symptoms back before the next dose. See Why Do Parkinson’s Symptoms Feel Different in the Morning and Evening?
Dyskinesia caused by long-term levodopa is also different from tardive dyskinesia, which is caused by certain psychiatric and anti-nausea medicines. See Tardive Dyskinesia: What It Is, Who Gets It, and How to Treat It.
Is It Always a Problem?
Not necessarily, Mild dyskinesia that does not bother the person is often accepted, because it usually means the medicine is working. Many people prefer mild dyskinesia to being “off” with stiffness and slowness. Treatment is usually considered when dyskinesia is troublesome: it causes discomfort or falls, interferes with daily activities, causes weight loss or exhaustion, or is socially distressing.
How Doctors Manage It
Please do not stop or reduce levodopa on your own. Sudden changes can cause severe worsening of symptoms. Options that a neurologist may consider include:
- Adjusting levodopa timing and dose, for example smaller, more frequent doses, to give a steadier supply
- Reviewing other Parkinson’s medicines, because some add-on medicines can increase dyskinesia, and adjusting them may help
- Amantadine, a medicine that is used to reduce dyskinesia in some people. Side effects such as confusion, hallucinations, or leg swelling are possible, so it needs medical supervision
- Continuous or device-aided delivery of medicine, such as an intestinal gel or a continuous infusion under the skin, which aim to deliver dopamine more steadily. Availability varies
- Deep brain stimulation (DBS), a surgical option that may reduce dyskinesia and allow lower medicine doses in carefully selected people. See Deep Brain Stimulation: Who Should Consider It?
Which option is suitable depends on the person’s age, general health, thinking and memory, other symptoms, and personal goals. Responses differ between individuals.
What You Can Do to Help the Care Team
- Keep a simple diary for a few days before the appointment, noting the times of medicines, when movements appear, how long they last, and how troublesome they are. Phone video clips can also help.
- Take medicines at the prescribed times, because irregular timing can worsen swings.
- Tell the doctor about related problems: painful cramps, weight loss, poor sleep, falls, or embarrassment.
- Stay active and hydrated, and follow any physiotherapy plan. See Bradykinesia Treatment: Effective Strategies and Solutions for related exercise strategies.
- Make the home safer if movements affect balance, with clear walkways and good lighting.
When to Seek Medical Advice
Consult your neurologist if new involuntary movements appear, existing ones are getting worse or more frequent, movements interfere with eating, sleeping, or walking, you have painful cramping, or you are having falls. Seek urgent help if there is sudden severe stiffness, high fever, or confusion after a medicine change.
About the reviewing doctor: Dr. Mitesh Chandarana, MBBS, MD (Internal Medicine), DM (Neurology), Fellowship in Movement Disorders (SCTIMST), Registration No. [SMR/NMR NUMBER]. Clinic address and appointment contact details are on the contact page.
This article is for general health education and is not a substitute for individual medical advice.
