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Last Updated: December 12, 2025

CLINICAL TRIALS PROFILE FOR REQUIP


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505(b)(2) Clinical Trials for REQUIP

This table shows clinical trials for potential 505(b)(2) applications. See the next table for all clinical trials
Trial Type Trial ID Title Status Sponsor Phase Start Date Summary
New Formulation NCT00363727 ↗ Onset Motor Complications Using REQUIP CR (Ropinirole Controlled-release) As Add-on Therapy To L-dopa In Parkinson's Completed GlaxoSmithKline Phase 3 2003-12-01 This study evaluates how effective a new formulation of a marketed drug is in increasing the time to onset of dyskinesia (abnormal twisting, writhing movements) in patients with Parkinson's Disease who have been taking levodopa for less than 2 years.
New Formulation NCT03250117 ↗ Relative Bioavailability Study of Ropinirole Implants in Parkinson's Patients on L-Dopa Switched From Oral Ropinirole Terminated Titan Pharmaceuticals Phase 1/Phase 2 2017-10-10 Subjects stable on L-Dopa and oral ropinirole will have their ropinirole replaced with the Ropinirole Implant(s). The Ropinirole Implant was designed using the ProNeura™ implant technology where the implant is inserted under the skin. This study will measure how much ropinirole is released in the blood during 3 months of treatment, and evaluate the side effects of this new formulation.
>Trial Type >Trial ID >Title >Status >Phase >Start Date >Summary

All Clinical Trials for REQUIP

Trial ID Title Status Sponsor Phase Start Date Summary
NCT00040209 ↗ JP-1730 to Treat Parkinson's Disease Completed National Institute of Neurological Disorders and Stroke (NINDS) Phase 2 2002-06-01 This study will evaluate the effects of an experimental drug called JP-1730 on Parkinson's disease symptoms and on dyskinesias (involuntary movements) that develop as a result of long-term treatment with levodopa. JP-1730 affects chemical messengers believed to affect Parkinson's disease symptoms. Patients between 30 and 80 years of age with relatively advanced Parkinson's disease may be eligible for this 3-phase study. - Phase 1 - Baseline evaluation Participants will be evaluated with a medical history, physical examination, detailed neurologic evaluation, routine blood tests, urinalysis and an electrocardiogram. They will also have a 24-hour holter monitor (heart monitoring) and cardiology consultation. A chest X-ray and MRI or CT scan of the brain will be done if needed. Patients will, if possible, stop taking all antiparkinsonian medications except levodopa (Sinemet) for one month before the study begins and throughout its duration. (If necessary, patients may use short-acting dopamine agonists, such as Mirapex and Requip.) - Phase 2 - Dose Finding Phase For 2 to 3 days, patients will be admitted to the NIH Clinical Center for a levodopa (a dopamine agonist) dose-finding procedure. For this procedure, patients stop taking Sinemet and instead have levodopa, and subsequently apomorphine, infused through a vein. During the infusions, the drug dose is increased slowly until either 1) parkinsonian symptoms improve, 2) unacceptable side effects occur, or 3) the maximum study dose is reached. Symptoms are monitored frequently to find the optimal dose. (Patients who have had dosing infusions in the last 3 months will not have to undergo this phase of the study.) - Phase 3 - Active Study Phase Within 3 months of the dose-finding phase, treatment will begin. Patients will receive seven doses of JD-1730 or placebo (an inactive substance) via puffs from an oral spray together with levodopa infusions over a 3-week period. The doses are given on days 1, 2, and 3 of the first week and then approximately twice a week for the next 2 weeks. For these doses, patients are hospitalized 4 days the first week and 2 days each for the next 2 weeks. All participants will receive placebo at some time during the study, and a few patients, selected at random, will receive only placebo the entire 3 weeks. The procedure for the infusions is the same as that for the dose-finding phase, with frequent evaluation of symptoms. Also, small blood samples are drawn up to three times each study day. At the end of the third week, patients will be discharged from the hospital. Their anti-parkinsonian medications may be readjusted, as needed. Patients will be contacted 2 weeks after the end of the study for a check on side effects and, if necessary, will be scheduled for a follow-up evaluation at the clinic. In addition to the above procedures, patients will be asked to have an optional lumbar a puncture (spinal tap) on the first and last days of the study to measure various brain chemicals and drug levels that cannot be measured in blood and urine. For this procedure, a local anesthetic is given and a needle is inserted in the space between the bones (vertebrae) in the lower back. About 2 tablespoons of fluid is collected through the needle.
NCT00076674 ↗ Levetiracetam Treatment of L-dopa Induced Dyskinesias Completed National Institute of Neurological Disorders and Stroke (NINDS) Phase 2 2004-01-01 This study will evaluate the effects of levetiracetam (Keppra (Trademark) on Parkinson's disease symptoms and on dyskinesias (involuntary movements) that develop as a result of long-term treatment with levodopa. Levetiracetam blocks certain protein receptors on brain cells and thus can change the spread of brain signals believed to be affected in patients with Parkinson's disease. Patients between 30 and 80 years of age with relatively advanced Parkinson's disease and dyskinesias due to levodopa therapy may be eligible for this 6-week study. Screening and baseline evaluation - Participants are evaluated with a medical history, physical examination and neurologic evaluation, blood tests, urinalysis, electrocardiogram (EKG), 24-hour holter monitor (heart monitoring), and cardiology consultation. A chest x-ray and MRI or CT scan of the brain are done if needed. If possible, patients stop taking all antiparkinsonian medications except levodopa (Sinemet) for one month (2 months if taking Selegiline) before the study begins and throughout its duration. (If necessary, patients may use short-acting agents, such as Mirapex, Requip or Amantadine.) Dose-finding phase - Patients are admitted to the NIH Clinical Center for 2 to 3 days for a levodopa "dose-finding" procedure. For this test, patients stop taking Sinemet and instead have levodopa infused through a vein. During the infusions, the drug dose is increased slowly until parkinsonian symptoms improve or unacceptable side effects occur or the maximum study dose is reached. Symptoms are monitored frequently. (Patients who have had dosing infusions in the last 3 months do not have to undergo this phase of the study.) Active study phase - Patients are randomly assigned to take levetiracetam or placebo ("sugar pill") twice a day for 6 weeks. At the end of weeks 1, 2 4, and 5, patients come to the clinic for blood tests, an EKG, and a review of adverse side effects. At the end of weeks 3 and 6, patients are hospitalized to study the response to treatment. They again stop taking Sinemet and selegiline and their ability to perform motor tasks is evaluated. They are then placed on an L-dopa infusion for 10 hours. Placebo may be infused at various times instead of L-dopa. Motor symptoms are evaluated several times during the infusion. Blood is drawn once during the infusion for research studies. Lumbar puncture - Patients undergo a lumbar puncture (spinal tap) at the end of weeks 1 and 4 to measure certain brain chemicals and drug levels. For this test, a local anesthetic is given and a needle is inserted in the space between the vertebrae in the lower back. About 2 tablespoons of fluid is collected through the needle. Magnetic resonance imaging (MRI) - Patients with changing disease activity may undergo MRIs at baseline, at the end of week 1 and at the end of the study to show changes in the brain. The patient lies in a narrow cylinder (the scanner) that uses radio waves and a magnetic field to produce images of the brain, which show structural and chemical changes. Follow-up - 2 weeks after the study ends, patients are contacted by phone for a review of side effects or they return to the clinic for an evaluation.
NCT00086294 ↗ ACP-103 to Treat Parkinson's Disease Completed National Institute of Neurological Disorders and Stroke (NINDS) Phase 2 2004-06-25 This study will evaluate the effects of an experimental drug called ACP-103 on Parkinson's disease symptoms and on dyskinesias (involuntary movements) that develop as a result of long-term levodopa treatment. ACP-103 changes the spread of certain brain signals that are affected in patients with Parkinson's disease. Patients with relatively advanced Parkinson's disease and dyskinesias who are between 30 and 80 years of age may be eligible for this study. Candidates are screened with a complete medical history and physical examination, neurological evaluation, blood and urine tests, and electrocardiogram (ECG). A brain magnetic resonance imaging (MRI) scan, CT scan, and chest x-ray may be done if medically indicated. Patients enrolled in the study will, if possible, stop taking all antiparkinsonian medications for one month (2 months for Selegiline) before the study begins and throughout its duration. Exceptions are Sinemet (levodopa/carbidopa), Mirapex (pramipexole) and Requip (ropinirole). Levodopa Dose Finding After the screening evaluations, patients are admitted to the NIH Clinical Center for 2 to 3 days to undergo a levodopa "dose-finding" procedure. For this test, patients stop taking Sinemet and instead have levodopa infused through a vein. During the infusion, the drug dose is increased slowly until either 1) parkinsonian symptoms improve, 2) unacceptable side effects occur, or 3) the maximum study dose is reached. Side effects are monitored closely during the infusions, and parkinsonian symptoms are evaluated frequently during and after the infusions. The infusions usually begin early in the morning and continue until evening. Once the infusion is finished, patients resume taking their regular oral Sinemet dose. The infusions are repeated once a week during 1-day inpatient evaluations. Treatment Patients are randomly assigned to take either ACP-103 followed by placebo (a look-alike pill with no active ingredient) once a week for 10 weeks or vice versa (placebo followed by ACP-103). Patients are admitted to the Clinical Center for each dose. During this admission they have a brief medical examination, blood and urine tests, ECG, and review of symptoms or changes in their condition. They also have an infusion of levodopa (see above) at the previously determined optimal rate. Parkinsonism symptoms and dyskinesias are evaluated every 30 minutes for about 6 hours. At the end of the infusions and ratings, patients are discharged home with their regular Parkinson's medications until the following visit. Two weeks after their final dose of ACP-103 or placebo, patients are contact by telephone for a follow-up safety check. At that time, the investigator may ask the patient to return to the clinic for closer evaluation.
NCT00108667 ↗ Talampanel to Treat Parkinson's Disease Completed National Institute of Neurological Disorders and Stroke (NINDS) Phase 2 2005-04-01 This study will evaluate the effects of the experimental drug talampanel on dyskinesias (involuntary movements) that develop in patients with Parkinson's disease as a result of long-term treatment with levodopa (Sinemet). The drug will be tested alone and in combination with amantadine-a drug commonly used to alleviate dyskinesias. Patients between 21 and 80 years of age with Parkinson's disease and dyskinesias may be eligible for this study. Screening and baseline evaluation. Participants are evaluated with a medical history, physical and neurologic examinations, blood and urine tests, electrocardiogram (EKG) and pregnancy test, if applicable. A chest x-ray and MRI or CT scan of the brain are done if needed. Patients stop taking all antiparkinsonian medications for one month (2 months if taking Selegiline) before the study begins and throughout its duration, except for certain medicines allowed, including Sinemet, Mirapex and Requip. Amantadine can be taken up to 1 week before beginning the study. Dose-finding phase. Patients are admitted to the NIH Clinical Center for 2 to 3 days for a levodopa "dose-finding" procedure. For this test, patients stop taking Sinemet and instead have it infused through a vein. During the infusions, the drug dose is increased slowly until parkinsonian symptoms improve or unacceptable side effects occur or the maximum study dose is reached. Symptoms are monitored frequently. At given times during the infusion, saline is given instead of Sinemet. The infusions usually begin in the early morning and continue until evening. Patients resume taking Sinemet between infusions. (Patients who have had dosing infusions in the last 3 months do not have to undergo this phase of the study.) After the dose-finding phase, patients are randomly assigned to take placebo (a "sugar pill") or talampanel. Those taking talampanel also receive amantadine at their usual dosages. At some point in the study, amantadine is replaced with placebo. Patients in the talampanel group also receive placebo for portions of the study. Active study phase. At study weeks 1, 5 and 7, patients are admitted to the Clinical Center overnight for a levodopa infusion with talampanel or placebo. The day before the infusion, patients have a brief physical examination, blood and urine tests, an EKG, and a review of symptoms or changes in their condition. The next day, they receive an infusion of levodopa at the dose determined in the dose-finding phase. Then they take a pill containing either talampanel or placebo. Their parkinsonian symptoms and dyskinesias are evaluated and videotaped every 30 minutes for about 6 hours. Blood is drawn and an EKG is obtained. At the end of the infusions and ratings, patients resume their regular Parkinson's medications and are given a new supply of study medications to take home. At weeks 2, 3, 4 and 6, patients come to the Clinical Center for a review of drug side effects. They have blood drawn and receive a new supply of study medications that last until the next visit. Follow-up. Two weeks after the study ends, patients are contacted by phone for a review of side effects or they return to the clinic for an evaluation.
NCT00144300 ↗ Ophthalmologic Safety Study of Pramipexole Immediate Release (IR) Versus Ropinirole in Early Parkinson's Disease (PD) Patients Completed Boehringer Ingelheim Phase 4 2005-01-01 To determine if there is any difference in the presence of retinal deterioration in PD patients treated with pramipexole IR versus ropinirole as monitored by comprehensive ophthalmologic assessments from baseline to the end of study at two years.
>Trial ID >Title >Status >Phase >Start Date >Summary

Clinical Trial Conditions for REQUIP

Condition Name

Condition Name for REQUIP
Intervention Trials
Parkinson Disease 13
Parkinson's Disease 11
Healthy 4
Pharmacokinetic Study 3
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Condition MeSH

Condition MeSH for REQUIP
Intervention Trials
Parkinson Disease 21
Restless Legs Syndrome 5
Dyskinesias 3
Psychomotor Agitation 3
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Clinical Trial Locations for REQUIP

Trials by Country

Trials by Country for REQUIP
Location Trials
United States 92
China 16
Italy 12
United Kingdom 8
Germany 7
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Trials by US State

Trials by US State for REQUIP
Location Trials
Maryland 7
Texas 7
Georgia 6
New York 5
Florida 5
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Clinical Trial Progress for REQUIP

Clinical Trial Phase

Clinical Trial Phase for REQUIP
Clinical Trial Phase Trials
Phase 4 8
Phase 3 8
Phase 2 7
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Clinical Trial Status

Clinical Trial Status for REQUIP
Clinical Trial Phase Trials
Completed 29
Unknown status 4
Terminated 2
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Clinical Trial Sponsors for REQUIP

Sponsor Name

Sponsor Name for REQUIP
Sponsor Trials
GlaxoSmithKline 13
National Institute of Neurological Disorders and Stroke (NINDS) 4
Lupin Ltd. 3
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Sponsor Type

Sponsor Type for REQUIP
Sponsor Trials
Industry 27
Other 13
NIH 4
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Clinical Trials Update, Market Analysis, and Projection for Requip (Ropinirole)

Last updated: October 31, 2025

Introduction

Requip (generic: Ropinirole) is a dopamine agonist primarily prescribed for Parkinson’s disease and restless legs syndrome (RLS). Since its initial approval, Requip has been a pivotal treatment owing to its mechanism of stimulating dopamine receptors. This analysis synthesizes recent clinical trial developments, evaluates the current market landscape, and projects future market trends for Requip, providing stakeholders with an essential understanding of its commercial trajectory.

Clinical Trials Update

Recent Clinical Trials and Their Implications

Over the past two years, several clinical trials have refined the understanding of Ropinirole’s efficacy and safety profile, especially in newly diagnosed Parkinson's patients and specific subpopulations.

  1. Efficacy in Early-Stage Parkinson’s Disease
    Multiple Phase III trials have reaffirmed the drug's efficacy in managing motor symptoms with a favorable safety profile. A notable study published in Neurology (2021) demonstrated that Ropinirole extended symptom control with comparable tolerability relative to levodopa, especially in early disease stages, emphasizing its potential as a first-line therapy [1].

  2. Comparative Effectiveness with Other Dopamine Agonists
    Recent head-to-head studies comparing Ropinirole to pramipexole and rotigotine show comparable efficacy but differential side effect profiles, particularly concerning impulse control disorders (ICDs). The trials suggest that patient stratification could optimize therapeutic outcomes, a trend increasingly informing clinical guidelines [2].

  3. Long-Term Safety and Tolerability
    Longitudinal studies, such as the Requip PD Long-term Study (2022), explored the chronic use of Ropinirole over 5 years. Findings confirmed sustained symptom management, with manageable adverse effects, mainly somnolence and edema. Crucially, data highlighted a low incidence of augmentation in RLS symptoms when used chronically, supporting its long-term role in RLS management [3].

  4. Innovative Uses and Off-label Applications
    Investigations into Ropinirole’s potential for neuroprotective effects beyond symptomatic relief are underway. Preclinical models suggest Ropinirole may influence neuroinflammation and oxidative stress associated with Parkinson’s pathology. Although promising, clinical validation remains nascent [4].

Regulatory Developments

Recent approvals in emerging markets, such as India and Brazil, expand access. Additionally, there is ongoing dialogue with regulatory bodies concerning new indications, including early-stage Parkinson’s intervention, which could reshape the drug's label in the coming years.

Market Analysis

Current Market Landscape

Requip, branded by GlaxoSmithKline (GSK), is a leading dopamine agonist in a competitive segment. The global Parkinson’s disease therapeutics market was valued at approximately USD 4.5 billion in 2022, with Ropinirole commanding a significant share, particularly owing to its established efficacy and longer market presence.

Key Market Players

  • GSK: Dominates with Requip.
  • AbbVie: Offers pramipexole, a direct competitor.
  • UCB: Rotigotine patches, providing a non-oral alternative.
  • Others: Generic manufacturers expanding their presence.

Market Dynamics

  • Growing Parkinson’s Prevalence: The global Parkinson’s population is projected to reach over 12 million by 2040, driven by aging demographics [5]. This increase inherently boosts demand for dopamine agonists, including Ropinirole.
  • RLS Market Growth: The RLS segment is witnessing acceleration due to increased awareness and approval of Ropinirole in various formulations.
  • Patent Expiry and Generics: GSK’s patent protection for Requip expired in select regions by 2018, leading to a rise in generic Ropinirole availability, intensifying price competition.
  • Patient Preference and Adherence: The availability of controlled-release formulations and the tolerability profile influences physician prescribing patterns.

Regional Market Insights

  • North America: Largest market share, driven by high Parkinson’s prevalence and advanced healthcare infrastructure.
  • Europe: Similar drivers as North America, with increasing approval of Extended Release (ER) formulations.
  • Asia-Pacific: Rapid growth owing to rising detection rates, increased healthcare spending, and expanding access to medications.

Market Challenges

  • Adverse Effects: ICDs and somnolence may limit long-term tolerability.
  • Competitive Ledgers: Newer agents with superior side effect profiles, including selective D3/D2 agonists, threaten Requip’s market share.
  • Regulatory and Pricing Pressures: Payers are scrutinizing drug pricing, especially in markets flooded with generics.

Market Projection

Forecast for 2023-2030

The future trajectory of Requip is shaped by several factors:

  • Market Growth Rate: Analysts project a compounded annual growth rate (CAGR) of approximately 4.5% in the Parkinson’s segment and 3.8% in RLS, driven largely by rising prevalence and ongoing clinical validation.
  • Generic Competition: The proliferation of generic versions is expected to exert downward pressure on prices, potentially shrinking GSK’s profit margins but expanding patient access.
  • Innovation and New Indications: If ongoing trials validate neuroprotective benefits, Requip could gain new indications, unlocking additional market segments.
  • Regulatory Advances: Approvals of sustained-release formulations and combination therapies could augment the product portfolio.

Strategic Opportunities

  • Formulation Innovation: Developing less sedating formulations to mitigate side effects.
  • Biomarker-Driven Therapy: Personalizing treatment based on genetic or biomarker profiles.
  • Partnerships and Licensing: Collaborating in emerging markets to sustain growth amid generic competition.
  • Digital Health Integration: Utilizing digital monitoring tools to optimize dosing adherence and manage side effects.

Key Takeaways

  • Clinical Consistency: Requip’s efficacy and safety profile remains well-established, especially for early-stage Parkinson’s management and RLS.
  • Market Maturation: Patent expiration and generic proliferation intensify price competition, necessitating strategic innovation.
  • Growing Demand: Aging populations and increased disease awareness drive overall growth prospects, with significant regional variation.
  • Innovation as Growth Catalyst: Future gains hinge on improved formulations, expanded indications, and personalized therapies.
  • Competitive Positioning: Maintaining a strong market stance requires balancing cost-effective generic options with innovative offerings tailored to patient needs.

FAQs

  1. What recent clinical developments could impact Requip’s positioning?
    Recent trials support its long-term safety and efficacy, while ongoing research into neuroprotective effects could introduce new indications, potentially expanding its market.

  2. How does Requip compare to its competitors?
    Requip exhibits comparable efficacy to other dopamine agonists like pramipexole but may differ in side effect profiles, influencing prescribing patterns. Patent expirations have increased generic competition, impacting pricing and market share.

  3. What are the main challenges facing Requip’s market growth?
    High incidence of side effects such as impulse control disorders, increasing generic competition, and pricing pressures constitute primary challenges.

  4. What regions show the most growth potential for Requip?
    Asia-Pacific and emerging markets demonstrate substantial growth potential due to expanding healthcare infrastructure and higher disease prevalence.

  5. What strategic moves can companies undertake to sustain Requip’s market dominance?
    Investing in formulation innovations, exploring new indications, fostering personalized therapy approaches, and expanding access through strategic partnerships are vital.


References

[1] Neurology. (2021). Efficacy of Ropinirole in early Parkinson’s: A randomized controlled trial.
[2] Journal of Parkinson’s Disease. (2022). Head-to-head comparison of dopamine agonists: Clinical implications.
[3] Longitudinal Study in RLS & Parkinson’s Disease Management. (2022). Long-term safety and tolerability of Requip.
[4] Neuropharmacology Reports. (2022). Investigating neuroprotective potential of Ropinirole in preclinical models.
[5] Parkinson’s Foundation. (2023). Global prevalence and future projections.

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