TheraRadar
Data updated: May 26, 2026

RYTARY (carbidopa)

CNS Approved 2015-01-07

RYTARY is indicated for the treatment of Parkinson's Disease; Post-Encephalitic Parkinsonism; Parkinsonism.

Source: FDA Label • IMPAX • Aromatic Amino Acid

How RYTARY Works

RYTARY functions by increasing dopamine levels in the central nervous system. Levodopa, a precursor to dopamine, crosses the blood-brain barrier and is converted into dopamine to relieve symptoms. Carbidopa acts as an inhibitor of peripheral decarboxylation, preventing the breakdown of levodopa in extracerebral tissues and ensuring more of the drug reaches the brain.

1
Indication
--
Phase 3 Trials
11
Years on Market

Details

Status
Prescription
First Approved
2015-01-07
Patent Cliff
2028

Pro Metrics

Patent cliff and revenue data

Unlock with Pro
Routes
ORAL
Dosage Forms
CAPSULE, EXTENDED RELEASE

Companies

Active Ingredient: CARBIDOPA , LEVODOPA

RYTARY Approval History

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
Original
New Indication
New Form
Label Update
32 FDA actions from 2015 to 2026
Mar 2026 SUPPL
Label · Labeling
Dec 2019 SUPPL
Label · Labeling
Oct 2016 SUPPL
Label · Labeling

What RYTARY Treats

3 indications

RYTARY is approved for 3 conditions since its original approval in 2015. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Parkinson's Disease
  • Post-Encephalitic Parkinsonism
  • Parkinsonism
Source: FDA Label

RYTARY Competitive Set

Pro

Three rings of competition based on shared molecular targets and treated indications.

Unlock 8 more competitors across all three rings.
Upgrade to Pro

Filters applied: drops same-active-ingredient (505(b)(2) reformulations), route-mismatch (topical vs systemic), and cross-therapeutic-area matches in same-indication rings.

Drugs Similar to RYTARY

3 of 20

FDA-approved drugs for similar conditions. Compare mechanisms and indications to understand treatment alternatives.

CREXONT
CARBIDOPA
3 shared
IMPAX
Shared indications:
Parkinson's DiseasePost-Encephalitic ParkinsonismParkinsonism
DHIVY
CARBIDOPA
3 shared
AVION PHARMS
Shared indications:
Parkinson's DiseasePost-Encephalitic ParkinsonismParkinsonism
SINEMET
CARBIDOPA
3 shared
Merck
Shared indications:
Parkinson's DiseasePost-Encephalitic ParkinsonismParkinsonism
📋

Clinical Trial Registry

17 trials
Trial Sponsor ID Phase Status Title
NCT04520178 5-HTP only Pro00119483/00125176 Ph 2, Ph 3 recruiting Effects of 5HTP on the Injured Human Spinal Cord
NCT04325503 RES results posted HUM00156490 5U01AG061393-05 Ph 1, Ph 2 completed Neurobiological Drivers of Mobility Resilience: The Dopaminergic System
NCT01323374 FMS201 Droxidopa FMS201 Ph 2 completed Study To Assess The Clinical Benefit Of Droxidopa And Droxidopa/Carbidopa In Subjects With Fibromyalgia
NCT04000919 18.1268 Ph 2, Ph 3 suspended Effects of 5HTP and LDOPA on CNS Excitability After SCI
NCT00685919 results posted 101499 HL071784-05A1 Ph 2, Ph 3 completed Peripheral Dopamine in Postural Tachycardia Syndrome
NCT03055936 COMDOS1 results posted 3112005 Ph 1 completed Dose-finding Pharmacokinetic Study in Healthy Males
NCT03266965 20161186 W81XWH-16-1-0462 Ph 1 completed Histaminergic Basis of Central Fatigue in Multiple Sclerosis - A Novel Approach
NCT03115827 results posted VUMC54580 Ph 4 completed Norepinephrine-targeted Therapy for Action Control in Parkinson Disease
NCT01399905 results posted IRB00004133 Ph 2 completed High and Low Dose Carbidopa Treatment of Parkinson's Disease
NCT00845000 results posted P05550 MK-3814-023 Ph 1 completed Acute Effects of Preladenant (SCH 420814) on Dyskinesia and Parkinsonism in Levodopa Treated Participants (P05550)
NCT02633839 CVT-301-007 Ph 1 completed A Study of the Safety and Levodopa Pharmacokinetics Following Single Dose Administration of CVT 301 (Levodopa Inhalation Powder) in Smoking and Non-Smoking Adults
NCT02633007 CVT-301-008 Ph 1 completed A Study of the Safety and Pharmacokinetics of Levodopa Following Administration of CVT 301 (Levodopa Inhalation Powder) in Adults With Asthma
NCT01212484 results posted 09-0011 Ph 3 completed Carbidopa for the Treatment of Nausea and Vomiting in Familial Dysautonomia
NCT01227655 BIPARKII results posted BIA-91067-302 2010-022366-27, BIA-91067-302 Ph 3 completed Efficacy and Safety of BIA 9-1067 in Idiopathic Parkinson's Disease Patients.
NCT01568073 results posted BIA-91067-301 2010-021860-13 Ph 3 completed Efficacy and Safety of BIA 9-1067 in Idiopathic Parkinson's Disease Patients With "Wearing-off" Phenomenon
NCT01229332 ND0611/002 Ph 1, Ph 2 completed A Safety, Tolerability and Pharmacokinetic Study of ND0611 on the Top of Different Oral Dosage Forms of Levodopa/Carbidopa in Parkinson's Disease Patients
NCT01296464 PARTEST 2939136 Ph 2 completed Comparing Different Levodopa/Carbidopa/Entacapone Treatment Regimens
🔬

Active Pipeline

Pro

Ongoing clinical trials by development phase

Loading...

Key Completed Trials

Pro

Completed studies with published results, ranked by significance

Loading...
📊

Trial Timeline

Full development history with FDA approval milestones

|
Loading...
Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

RYTARY FDA Label Details

Indications & Usage

FDA Label (PDF)

RYTARY is indicated for the treatment of Parkinson's Disease; Post-Encephalitic Parkinsonism; Parkinsonism.

View full patent landscape →
8 OB patents · 1 families · 46 international docs across 12 countries

RYTARY Patents & Exclusivity

Latest Patent: Dec 2028

Patents (8 active)

US9089607 Expires Dec 26, 2028
US8377474 Expires Dec 26, 2028
US8454998 Expires Dec 26, 2028
US8557283 Expires Dec 26, 2028
US9901640 Expires Dec 26, 2028
US9533046 Expires Dec 26, 2028
US9463246 Expires Dec 26, 2028
US9089608 Expires Dec 26, 2028
Source: FDA Orange Book

Pro Intelligence Preview

Deep insights for RYTARY

Revenue Insights

  • Quarterly revenue tracking
  • Historical trend analysis

Patent Timeline

  • Cliff: 2028
  • 240 active patents

Trial Analysis

  • Clinical trial tracking
  • Development stage analysis

Competitive Landscape

  • 20 similar drugs
  • Same target/indication analysis
Unlock Full Intelligence

Full approval history • All patents • Revenue trends • Competitor analysis

Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.