These are lists of investigational drugs:
- List of investigational analgesics
- List of investigational antidepressants
- List of investigational antipsychotics
- List of investigational anxiolytics
- List of investigational attention deficit hyperactivity disorder drugs
- List of investigational hallucinogens and entactogens
- List of investigational obsessive–compulsive disorder drugs
- List of investigational sex-hormonal agents
- List of investigational sexual dysfunction drugs
- List of investigational sleep drugs