When someone suffers a brain injury or develops a neurological disease, the impact on their memory and thinking can be devastating. Families and doctors are desperate for treatments that might help. A new analysis looked at whether ketamine—a drug with a complex reputation—could play a role in improving cognitive function in these situations.
The review pooled results from 22 studies. In animal models of conditions like traumatic brain injury, epilepsy, and Parkinson's disease, the findings were largely positive, with most studies showing ketamine helped with cognitive tasks. However, the picture changed dramatically when looking at the single human study included, which involved patients with Huntington's disease. In that trial, intravenous ketamine actually caused a short-term, dose-dependent worsening of cognitive function.
This stark contrast is the core of the story. The evidence from animals suggests a potential effect worth exploring, but it is just that—preclinical. The human evidence is currently limited to one study showing harm in one specific disease. The researchers are clear: this analysis does not support using ketamine to try to enhance cognition in patients with neurological conditions. Much more research in people is needed to understand if, when, and for whom this approach could ever be safe or helpful.