Head-to-head evidence
Melevodopa/carbidopa (Sirio) vs WD-1603
Same mechanism, same race: design-graded trial evidence for both assets, with the grading rationale shown. Grades describe the quality of the evidence, never the merits of either security.
Parkinson's Disease
Shared mechanism: dopamine precursor · full Parkinson's Disease pipeline
Melevodopa/carbidopa (Sirio)
Developed by Chiesi Farmaceutici
NCT00491998 · Phase 1/2 · completed
The study was randomized and double-blind, with a planned enrollment of 27 participants and a comparison with standard levodopa/carbidopa tablets. Registry results were not posted at the time of grading; the key result shown was recovered from the cited external source.
WD-1603
Developed by Hong Kong WD Pharmaceutical Co., Limited
NCT05036473 · Phase 2 · completed
This randomized, double-blind, placebo-controlled Phase 2 trial in early Parkinson's disease enrolled only 40 patients across three dose groups and placebo. All three doses of WD-1603 produced a statistically significant improvement in combined motor and daily-living function scores versus placebo at 27 days, with the largest effect at the highest dose (p=0.0003), but the very small sample size means these results need confirmation in a larger trial.
The full competitive landscape for each asset (every same-race competitor with aligned evidence, sortable) is on the asset pages: Melevodopa/carbidopa (Sirio)'s landscape · WD-1603's landscape