Summary
Pyridostigmine Bromide has reached the approved stage (maximum clinical phase 4) for at least one indication, so its use in Parkinson's Disease would be drug repurposing rather than first-in-human development. This does not mean it is approved for Parkinson's Disease. ClinicalTrials.gov lists 2 registered trials linking Pyridostigmine Bromide to Parkinson's Disease: 1 is currently recruiting; 1 has completed. The most advanced is Phase 2 (NCT01993680). It plans or enrolled 18 participants. Registration activity spans 2012 to 2022. No published literature item is linked to Pyridostigmine Bromide and Parkinson's Disease in the OSMF database yet, so the record rests on registry entries alone. Registry entries describe intent to study, not outcomes.
The RepurpOS disease-intelligence file for Parkinson Disease ranks 540 candidate therapeutics from Open Targets, ChEMBL, DGIdb and PubMed; only a minority carry direct clinical evidence, and this page covers one of those. Spontaneous remission context recorded for the condition: Progressive neurodegeneration — no spontaneous remission; untreated motor decline averages 3-5 UPDRS points/year; non-motor symptoms (depression, cognitive decline, autonomic dysfunction) also progressive.
Evidence table
| Evidence tier | A · Strong |
|---|---|
| Evidence score | 27.5 (trials 7.5, literature 0.0, tier 15, approved bonus 5.0) |
| Registered trials | 2 total: 1 recruiting, 0 active / not yet recruiting, 1 completed, 0 other |
| Linked publications | 0 |
| Agent type | Drug (Small molecule) |
| Development stage (any indication) | Approved |
| Mechanism / class | inhibitor |
| Data sources | DGIdb |
| Linked via biomarker / target | ACHE |
How the evidence score is calculated
- Each registered trial scores by status (recruiting / active / enrolling 3, completed 2.5, not yet recruiting 2, unknown 1, terminated / withdrawn / suspended 0.5) plus a phase bonus (phase 3-4 +2, phase 2 +1, phase 1 +0.5). The trial component is capped at 30.
- Each literature item scores by design (Cochrane review 5, meta-analysis 4, systematic review 3, RCT 3, clinical trial publication 2, curated reference 1.5, other PubMed record 1). The literature component is capped at 30.
- The existing evidence tier adds 15 (A / Strong), 10 (B / Moderate), 5 (C / Preliminary) or 0 (D / Anecdotal).
- Agents approved for any indication (max clinical phase 4) add 5, because an approved agent has an established safety profile that lowers the barrier to repurposing trials.
- The score ranks what has been studied, not what works. It does not read effect sizes or directions of effect.
Registered clinical trials
| NCT ID | Title | Status | Phase | Enrolment |
|---|---|---|---|---|
| NCT01993680 | Orthostatic Dysregulation and Associated Gastrointestinal Dysfunction in Parkinson's Disease -Treatment 2012 | completed | Phase 2 | 18 |
| NCT05603715 | Pyridostigmine for the Treatment of Constipation in Parkinson Disease 2022 | recruiting | Phase 2 | 16 |
Published literature
No publication is linked to this pair yet.
Mechanism and notes
Recorded mechanism or class: inhibitor.
OSMF's existing evidence tier for this pair is A (Strong), derived from the strength of the disease association recorded in DGIdb, in this case via the biomarker or target ACHE. The tier describes how well the drug-disease link is documented, not how well the drug works.
Frequently asked questions
Is Pyridostigmine Bromide approved for Parkinson's Disease?
Pyridostigmine Bromide has reached the approved stage (maximum clinical phase 4) for at least one indication, so its use in Parkinson's Disease would be drug repurposing rather than first-in-human development. This does not mean it is approved for Parkinson's Disease. Approval status for the specific indication should always be confirmed with the relevant regulator and prescribing information.
Is Pyridostigmine Bromide in clinical trials for Parkinson's Disease?
ClinicalTrials.gov lists 2 registered trials linking Pyridostigmine Bromide to Parkinson's Disease: 1 is currently recruiting; 1 has completed. The most advanced is Phase 2 (NCT01993680). It plans or enrolled 18 participants. Registration activity spans 2012 to 2022.
What does the evidence show for Pyridostigmine Bromide in Parkinson's Disease?
Pyridostigmine Bromide has 1 completed registered trial for Parkinson's Disease but no linked publication, which usually means results are unpublished, pending, or not yet matched to this record. OSMF's existing evidence tier for this pair is A (Strong), derived from the strength of the disease association recorded in DGIdb, in this case via the biomarker or target ACHE. The tier describes how well the drug-disease link is documented, not how well the drug works.
Cite this page
Data: ClinicalTrials.gov, PubMed, Open Targets, ChEMBL, DGIdb and the OSMF therapeutic agent database. Last updated 2026-07-05. Page built 2026-10-07.