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 autism and pervasive developmental 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
• List of investigational social anxiety disorder drugs