This is a list of investigational Parkinson's disease drugs, or drugs that are currently under development for clinical use in the treatment of Parkinson's disease but are not yet approved. They may also be referred to as investigational antiparkinsonian agents.
Chemical/generic names are listed first, with developmental code names, synonyms, and brand names in parentheses. The format of list items is "Name (Synonyms) â Mechanism of Action [Reference]".
This list was last comprehensively updated in September 2025. It is likely to become outdated with time.
Under development
Preregistration
Phase 3
Phase 2/3
Phase 2
Phase 1/2
Phase 1
Preclinical
Research
Clinical phase unknown
Not under development
Suspended
No development reported
Discontinued
Clinically used drugs
Approved drugs
Dopamine precursors and related
Dopamine receptor agonists
Monoamine oxidase B (MAO-B) inhibitors
Catechol O-methyltransferase (COMT) inhibitors
Drugs with unknown mechanisms of action
Combination drugs
Other drugs
Withdrawn drugs
Off-label drugs
- Acetylcholinesterase inhibitors (e.g., donepezil, galantamine, rivastigmine) â cognitive impairment in Parkinson's disease
- Anticholinergics (antimuscarinics/muscarinic acetylcholine receptor antagonists) (e.g., trihexyphenidyl, procyclidine, diphenhydramine, benztropine, ethopropazine, cycrimine, biperiden, others)
- Antidepressants (e.g., SSRIs, SNRIs, TCAs, MAOIs, others) â depression in Parkinson's disease
- Atypical antipsychotics (e.g., clozapine, quetiapine) â Parkinson's disease psychosis
- Hypnotics (e.g., eszopiclone, melatonin â insomnia in Parkinson's disease
- Memantine (Namenda) â cognitive impairment in Parkinson's disease
- Serotonergic psychedelics (e.g., psilocybin)
- Stimulants and related (e.g., methylphenidate, modafinil) â fatigue and apathy in Parkinson's disease
- Wakefulness-promoting agents (e.g., caffeine, modafinil) â excessive sleepiness in Parkinson's disease
See also
References
External links