Carbidopa Patent Expiration

Carbidopa was first introduced by Aton Pharma Inc in its drug Lodosyn on Approved Prior to Jan 1, 1982. 8 different companies have introduced drugs containing Carbidopa.


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Clinical Trials

Recent Clinical Trials on Carbidopa:

Sometimes companies keep conducting clinical trials even after the drug's approval to discover new formulations, methods of use, or new treatment indications, so they could file for additional patents or receive regulatory exclusivity extensions, such as pediatric exclusivity, potentially delaying generic competition. Based on these recent clinical trials, generic companies need to consider the potential for new intellectual property or regulatory hurdles. These strategic moves by the drug owner might delay generic substitution or lead to additional sales of the brand drug, even after patent expiry.

Title Lead Sponsor Collaborators Status Phases
Clinical Trials
Effects of 5HTP on the Injured Human Spinal Cord University of Alberta NA ACTIVE NOT RECRUITING
(Sep 1, 2026)
PHASE2, PHASE3
A Study to Assess Effect of Dosing Intervals on Multiple-Dose Pharmacokinetics of WD-1603 Taken Before Meals in Healthy Participants Shanghai WD Pharmaceutical Co., Ltd. NA COMPLETED
(Sep 1, 2026)
PHASE1
Dopaminergic Dysfunction in Late-Life Depression Vanderbilt University Medical Center NA COMPLETED
(Aug 1, 2026)
PHASE2
Comparative Bioavailability Study of Carbidopa/Levodopa Extended-Release Tablets Under Fasting and Fed Conditions Shanghai WD Pharmaceutical Co., Ltd. NA COMPLETED
(Aug 1, 2026)
PHASE1
A Safety, Tolerability and Levodopa Pharmacokinetics Study of Repeated ND0612 in Parkinson's Disease Patients NeuroDerm Ltd. NA COMPLETED
(Jul 1, 2026)
PHASE2
A Study to Evaluate the Efficacy and Safety of HRG2010 in Parkinson's Disease With Motor Fluctuations Jiangsu HengRui Medicine Co., Ltd. NA COMPLETED
(Jun 1, 2026)
PHASE3
Extension Study To Evaluate Safety And Tolerability Of 24-Hour Daily Exposure Of Continuous Subcutaneous Infusion of ABBV-951 In Adult Participants With Parkinson's Disease AbbVie NA COMPLETED
(May 1, 2026)
PHASE3
Study To Assess Adverse Events and Change in Disease Activity Of 24-hour Continuous Subcutaneous Infusion Of ABBV-951 In Adult Participants With Advanced Parkinson's Disease AbbVie NA COMPLETED
(May 1, 2026)
PHASE3
The Role of Brain Dopamine in Chronic Pain University of Rochester NA RECRUITING
(May 1, 2026)
PHASE2
Neurobiological Drivers of Mobility Resilience: The Dopaminergic System - Supplemental Open-Label Arm University of Michigan NA COMPLETED
(Apr 1, 2026)
PHASE1, PHASE2
Etoricoxib in Patients With Parkinsonian Disease Ihab Elsayed Hassan NA RECRUITING
(Apr 1, 2026)
PHASE2
Clinical Study to Evaluate the Possible Efficacy of Metformin in Patients With Parkinson's Disease Tanta University NA COMPLETED
(Mar 1, 2026)
PHASE2
Montelukast in Parkinson Disease Mostafa Bahaa NA RECRUITING
(Mar 1, 2026)
PHASE2, PHASE3


Carbidopa Generic API Manufacturers

Several generic applications have been filed for Carbidopa. The first generic version for Carbidopa was by Ani Pharmaceuticals Inc and was approved on Mar 10, 2014. And the latest generic version is by Regcon Holdings Llc and was approved on Dec 11, 2023.

Given below is the list of companies who have filed for Carbidopa generic, along with the locations of their manufacturing plants worldwide.