Drug repurposing is a strategy to identify new indications for already approved
drugs. A recent successful example in psychiatry is ketamine, an anesthetic drug
developed in the 1960s, now approved and clinically used as a fast-acting
antidepressant. Here, we describe the potential of dexmedetomidine as a
psychopharmacological repurposing candidate. This
α2-adrenoceptor agonist is approved in the US and Europe for
procedural sedation in intensive care. It has shown fast-acting inhibitory
effects on perioperative stress-related pathologies, including psychomotor
agitation, hyperalgesia, and neuroinflammatory overdrive, proving potentially
useful in clinical psychiatry. We offer an overview of the pharmacological
profile and effects of dexmedetomidine with potential utility for the treatment
of neuropsychiatric symptoms. Dexmedetomidine exerts fast-acting and robust
sedation, anxiolytic, analgesic, sleep-modulating, and anti-inflammatory
effects. Moreover, the drug prevents postoperative agitation and delirium,
possibly via neuroprotective mechanisms. While evidence in animals and humans
supports these properties, larger controlled trials in clinical samples are
generally scarce, and systematic studies with psychiatric patients do not exist.
In conclusion, dexmedetomidine is a promising candidate for an experimental
treatment targeting stress-related pathologies common in neuropsychiatric
disorders such as depression, anxiety disorders, and posttraumatic stress
disorder. First small proof-of-concept studies and then larger controlled
clinical trials are warranted in psychiatric populations to test the feasibility
and efficacy of dexmedetomidine in these conditions.