As a psychiatrist, I’ve done countless consults, and one of the most challenging things to explain is that delirium is caused by an underlying medical condition—not a psychiatric one. There’s no specific psychiatric medication to directly treat delirium. Instead, treatment focuses on environmental adjustments, like placing a clock in the room, displaying the date clearly, and providing frequent reorientation to help ground the patient.
One area where psychiatry might make a difference, though, is in addressing sleep issues. Many patients with delirium also have irregular sleep patterns, which is why melatonin is often suggested. However, when orexin antagonists like Suvorexant came on the market, they offered improvements in both sleep quality and quantity without the risky side effects of benzodiazepines and Z-drugs. These medications became a potential option for preventing and possibly treating delirium in various forms.
Recently, Suvorexant underwent a phase-3 trial for delirium prevention, but the results weren’t as promising as hoped. While the Suvorexant group did show a lower incidence of delirium in older hospitalized adults compared to the placebo group, the difference wasn’t statistically significant. On the bright side, the drug was linked to significantly lower delirium rates in patients with hyperactive and mixed subtypes of dementia, which may open doors for further exploration in these specific cases.
Link to the study: https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2822422