Parkinson's Disease Medications: A Comprehensive Guide to Treatment Options
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 17, 2026
Medications for Parkinson's disease (PD) mainly help with symptom management and cannot cure the condition. The most common is levodopa, and most people take a combination of medications [1]. This guide explains the main drug classes, what they do, their side effects, and what to expect over time.
Quick Answer: What medications treat Parkinson's disease?
Parkinson's disease medications aim to manage dopamine levels, which fall as brain cells in the substantia nigra die. Levodopa combined with carbidopa is the go-to treatment, with dopamine agonists, MAO-B inhibitors and others as options, and most people need a combination. Abruptly stopping levodopa can cause a life-threatening complication, so never stop a medication without your provider. [1]
What the research says
Levodopa is still the most common first-line medication, but no drug yet slows progression. A 2021 Lancet seminar states that levodopa is the most common first-line medication, that there is no reason to postpone symptomatic treatment in people developing disability, and that at present no therapy can slow down or arrest progression (Bloem et al., Lancet, 2021).
Add-on drugs shorten daily off time by roughly an hour. A network meta-analysis of 74 randomized trials (18,693 patients with motor complications) found that, compared with placebo, adding COMT inhibitors reduced daily off-medication time by 0.8 hours (95% CI 0.6 to 1.0), dopamine agonists by 1.1 hours (95% CI 0.8 to 1.4), and MAO-B inhibitors by 0.9 hours (95% CI 0.6 to 1.2). All three classes also raised the risk of dyskinesia (odds ratios 3.3, 3.0, and 1.6) (Sisodia et al., BMJ Neurol Open, 2024).
Amantadine has randomized-trial support for dyskinesia. A 2021 Lancet Neurology review reports that randomized controlled trial evidence from the past 5 years confirmed amantadine's efficacy for levodopa-induced dyskinesias in people with PD, and that clinical studies also support its potential to reduce motor fluctuations (Rascol et al., Lancet Neurol, 2021).
Research summaries are based on article abstracts retrieved from PubMed.
How do Parkinson's disease medications work?
Parkinson's disease is a progressive neurological condition that affects how your body moves. It can also affect your sense of smell, sleep, and digestion. It happens because certain nerve cells in the brain, many of them in the substantia nigra, die or become damaged and lose the ability to produce the neurotransmitter dopamine [1]. Most medications for PD try to manage dopamine levels, or other neurotransmitters that affect those levels [1].
The table below summarizes the main medication classes [1]:
Medication class | Examples (brand names) | Main role |
|---|---|---|
Levodopa and carbidopa | Sinemet, Rytary, Parcopa, Dhivy | Dopamine replacement; the go-to treatment |
Dopamine agonists | Pramipexole (Mirapex), ropinirole (Requip), rotigotine (Neupro) | Activate dopamine receptors; may lengthen the effect of levodopa |
MAO-B inhibitors | Selegiline (Carbex, Eldepryl), rasagiline (Azilect) | Slow the enzyme that breaks down dopamine |
COMT inhibitors | Entacapone (Comtan), opicapone (Ongentys) | Extend the duration of levodopa's effect |
Amantadine | Osmolex, Gocovri, Symmetrel | Reduces dyskinesia; also treats dystonia |
Anticholinergics | Benztropine (Cogentin), trihexyphenidyl (Artane) | Reduce tremor and muscle rigidity |
Adenosine A2A antagonist | Istradefylline (Nourianz) | Improves motor control, especially between doses |
Source: Cleveland Clinic [1].
Levodopa and Carbidopa
Levodopa is the go-to treatment for PD. It is a dopamine replacement agent that crosses the blood-brain barrier and is converted to dopamine in the nervous system [1]. Blood enzymes break down most levodopa before it reaches the brain, so it is combined with carbidopa, an enzyme inhibitor. This lets more levodopa reach the brain and helps reduce severe nausea and vomiting, which are common side effects of levodopa alone [1]. For most people, levodopa reduces slowness, stiffness, and tremor, and it is especially effective for loss of spontaneous movement and muscle rigidity [1].
Illustration of how levodopa crosses the blood-brain barrier and is converted to dopamine in the brain.
Dopamine Agonists
Dopamine agonists activate dopamine receptors in the brain rather than being converted to dopamine. Providers may prescribe them for the early stages of PD or for younger people with the condition, and they may lengthen the duration of effectiveness of levodopa [1]. Rotigotine is delivered through a transdermal skin patch [1].
Enzyme Inhibitors
MAO-B and COMT inhibitors slow down the enzymes that break down dopamine in the brain, so more dopamine is available [1].
MAO-B inhibitors delay the breakdown of naturally occurring dopamine and dopamine formed from levodopa. Providers may prescribe them alongside levodopa because they may enhance and prolong its effectiveness [1].
COMT inhibitors are typically prescribed to extend the duration of the effect of levodopa [1].
Amantadine, Anticholinergics, and Istradefylline
Amantadine may be prescribed to reduce the twitching or writhing movements (dyskinesia) that result from dopaminergic treatment. It is an antiviral medication, but its antiviral effect is not what helps, and researchers are not sure exactly how it reduces dyskinesia. It also treats other movement symptoms, including dystonia [1] [3].
Anticholinergics help reduce tremor and muscle rigidity by blocking acetylcholine, whose effects become more intense when dopamine levels drop [1].
Istradefylline is a non-dopaminergic medication that can improve motor symptom control, especially during lapses between doses of dopaminergic medications [1].
Which medications treat the non-movement symptoms of Parkinson's disease?
Parkinson's disease can cause symptoms unrelated to movement, and providers may recommend other medications to treat them. Your healthcare provider may recommend other medications for specific conditions or symptoms [1]:
Symptom | Medication your provider may consider |
|---|---|
Erectile dysfunction | Sildenafil (Viagra) |
Daytime sleepiness | Modafinil (Provigil) |
Constipation | Polyethylene glycol (MiraLax, GlycoLax) |
Fatigue | Methylphenidate (Ritalin, Methylin) |
Dementia | Cholinesterase inhibitors |
Depression or anxiety | SSRIs (selective serotonin reuptake inhibitors) |
Psychosis-related symptoms, such as hallucinations | Antipsychotic medications, such as pimavanserin |
Source: Cleveland Clinic [1].
What are the side effects of Parkinson's disease medications?
Side effects vary by medication type, and combining medications can cause different side effects. Talk to your provider about what to watch for before starting a medication [1].
Medication class | Possible side effects |
|---|---|
Levodopa | Nausea and vomiting, dizziness, headache, daytime sleepiness, and low blood pressure on standing. In older people: confusion, hallucinations, delusions, psychosis, and agitation. |
Dopamine agonists | Hallucinations, delusions, confusion, drowsiness, nausea and vomiting, dry mouth, dizziness, and feeling faint on standing. These are common when starting and usually go away over several days. |
COMT inhibitors | Diarrhea and dyskinesia |
MAO-B inhibitors | Heartburn, nausea, dry mouth, and dizziness. Less commonly with selegiline: confusion, nightmares, and hallucinations. |
Amantadine | Difficulty concentrating, confusion, insomnia, nightmares, agitation, hallucinations, and leg swelling |
Anticholinergics | Cognitive deficits, dry mouth, blurred vision, sedation, delirium, hallucinations, constipation, and urinary retention |
Source: Cleveland Clinic [1].
In older people, dopamine agonists are more likely than levodopa to cause confusion, hallucinations, or psychosis, so providers prescribe them less often in this group [1]. Abruptly stopping levodopa or lowering the dose increases the risk of parkinsonism hyperpyrexia syndrome, a life-threatening complication very similar to neuroleptic malignant syndrome [1].
What can you expect over time with Parkinson's disease medications?
How your body responds depends on your age, how early you were diagnosed and started treatment, and your overall health. Most medications provide good symptom management for three to six years, and as PD worsens, your response becomes weaker [1]. Providers and researchers are developing new ways to adjust the dosing of levodopa and other medications to prolong their usefulness, and research is underway on medications that slow progression [1].
Follow your medication schedule carefully and take medications as prescribed. If side effects develop, tell your provider, and never stop a medication without talking to your provider first [1].
Taking medications on a consistent daily schedule is key to steady symptom control.
How can you care for yourself with Parkinson's disease beyond medication?
Other treatments, such as physical therapy, can also help manage PD symptoms. People who take part in a structured physical therapy program geared to PD typically have better symptom management and improved quality of life. Physical therapy can help improve balance, gait, and stability and help you stay active. Music therapy in fitness programs, cycling, and boxing especially benefit people with PD [1].
Physical activity is very important in managing PD, and people with PD should try to get at least 150 minutes of cardiovascular exercise per week [1]. A chronic diagnosis can also take a toll on mental health, so seek help from a mental health professional if PD is causing distress, depression, or anxiety [1].
Regular physical activity and monitoring are part of a proactive approach to living well with Parkinson's disease.
When should you see a doctor about Parkinson's disease medications?
Have regular appointments with your healthcare provider while taking PD medications so they can assess how well the medications are working and address new symptoms [1]. Talk to your provider if you develop bothersome side effects, if your symptoms are not improving or have gotten worse, or if you are thinking of stopping your medication [1].
What is the bottom line on Parkinson's disease medications?
Parkinson's disease medications manage symptoms but do not cure the condition. Levodopa with carbidopa remains the cornerstone, and dopamine agonists, enzyme inhibitors, amantadine, and other drugs are added to extend its effect or treat specific problems. Work closely with your neurology team to review how your medications are working, report side effects, and never stop a medication abruptly [1].
Frequently Asked Questions
What is the most common medication for Parkinson's disease?
Levodopa, combined with carbidopa, is the go-to treatment. It is the most effective medication for slowness of movement and for improving quality of life in people with idiopathic Parkinson's disease [1].
Can Parkinson's medications cure the disease?
No. Medications mainly help with symptom management and cannot cure Parkinson's disease [1]. A 2021 review adds that at present no therapy can slow down or arrest its progression [2].
Why is carbidopa combined with levodopa?
Blood enzymes break down most levodopa before it reaches the brain. Carbidopa, an enzyme inhibitor, lets more levodopa reach the brain and helps reduce severe nausea and vomiting, which are common side effects of levodopa alone [1].
What are dopamine agonists?
Dopamine agonists activate dopamine receptors in the brain. They may be prescribed in the early stages of Parkinson's disease or for younger people, and they may lengthen the duration of effectiveness of levodopa [1].
What is dyskinesia?
Dyskinesia refers to twitching or writhing movements that occur as a result of treatment with dopaminergic medications. Amantadine may be prescribed to help reduce it [1].
How do MAO-B inhibitors work?
MAO-B inhibitors slow down the enzyme that metabolizes dopamine in the brain, which delays the breakdown of natural dopamine and dopamine formed from levodopa. Providers may prescribe them alongside levodopa [1].
Is amantadine used for Parkinson's disease?
Yes. Although amantadine is an antiviral medication, its antiviral components are not what helps. It reduces dyskinesia and also treats other movement symptoms, including dystonia [1]. Randomized trial evidence supports its use for levodopa-induced dyskinesia [3].
Can I stop Parkinson's medication suddenly?
No. Abruptly stopping levodopa or lowering the dose increases the risk of parkinsonism hyperpyrexia syndrome, a life-threatening complication similar to neuroleptic malignant syndrome. Never stop a medication without talking to your provider first [1].
Do Parkinson's medications help with non-movement symptoms?
Other medications may be recommended for specific symptoms, such as modafinil for daytime sleepiness, polyethylene glycol for constipation, SSRIs for depression or anxiety, cholinesterase inhibitors for dementia, and pimavanserin for hallucinations [1].
How long do Parkinson's medications keep working?
Most provide good symptom management for three to six years, and the response weakens as the disease worsens. Providers and researchers are developing new ways to adjust dosing to prolong their usefulness [1].
Related Resources
External resource for deeper reading:
Related Reading
Parkinson's Physical Therapy: Goals, Exercises and What to Expect explains physical therapy for Parkinson's disease.
References
Cleveland Clinic. Parkinson's Disease Medications. Cleveland Clinic Health Library. Last updated November 9, 2023. https://my.clevelandclinic.org/health/treatments/parkinsons-disease-medications
Bloem BR, Okun MS, Klein C. Parkinson's disease. Lancet. 2021;397(10291):2284-2303. PMID: 33848468. DOI: 10.1016/S0140-6736(21)00218-X
Rascol O, Fabbri M, Poewe W. Amantadine in the treatment of Parkinson's disease and other movement disorders. Lancet Neurol. 2021;20(12):1048-1056. PMID: 34678171. DOI: 10.1016/S1474-4422(21)00249-0
Sisodia V, Dubbeld L, De Bie RMA, et al. Efficacy and safety of adjunctive oral therapy in Parkinson's disease with motor complications: a systematic review and network meta-analysis. BMJ Neurol Open. 2024;6(1):e000573. PMID: 38352047. DOI: 10.1136/bmjno-2023-000573
Medical disclaimer
This article is for informational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified health provider with any questions you may have about a medical condition.
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