Health
UK Researchers Prepare NHS Trial for Nitrous Oxide as Rapid Depression Treatment
Researchers at the University of Birmingham are preparing the first National Health Service (NHS) trial to test whether nitrous oxide, commonly known as “laughing gas,” can be safely and effectively used to treat severe or treatment-resistant depression. The move follows a major analysis combining the strongest clinical evidence to date on the gas’s potential antidepressant effects.
The study, published in eBioMedicine, examined how medically administered nitrous oxide (N₂O) affects adults with major depressive disorder (MDD) and treatment-resistant depression (TRD). TRD is typically diagnosed when patients fail to respond to at least two standard antidepressants, a situation affecting almost half of UK patients, earlier research indicates.
The analysis found that a single session inhaling 50 percent nitrous oxide produced significant reductions in depressive symptoms within 24 hours. These effects, however, were often short-lived, generally fading within a week. Repeated sessions appeared to provide more lasting improvements, echoing findings from studies on ketamine, another fast-acting treatment thought to influence similar glutamate pathways in the brain.
“Depression is a debilitating illness, made even more challenging by the fact that standard antidepressants do not provide meaningful relief for nearly half of patients,” said Kiranpreet Gill, PhD researcher at the University of Birmingham and lead author of the report. “This study consolidates the best available evidence suggesting that nitrous oxide can offer rapid and clinically significant short-term relief for patients with severe depression.”
While side effects such as nausea, dizziness, and headaches were relatively common, they were generally brief and no immediate safety concerns were identified. Researchers caution that the long-term effects of repeated nitrous oxide use remain largely unknown, and the limited number of trials makes it difficult to draw firm conclusions at this stage.
The work is part of the NIHR-funded Mental Health Mission Midlands Translational Centre, which aims to improve care for patients with severe and treatment-resistant depression. The upcoming NHS trial will assess whether nitrous oxide can be delivered safely and acceptably in clinical settings, potentially adding a new option to the growing field of rapid-acting depression treatments.
Gill added that larger trials will be necessary to determine safe, repeatable dosing strategies and to evaluate the long-term outcomes for patients. If successful, nitrous oxide could become an important addition to current therapeutic options, offering fast relief for those who do not benefit from conventional antidepressants.
Health
Global Mental Health Cases Near 1.2 Billion as Anxiety and Depression Drive Sharp Worldwide Rise
A major global analysis has found that mental health conditions have surged to an estimated 1.2 billion people worldwide, driven largely by steep increases in anxiety and depression over the past three decades.
The findings, published in The Lancet as part of the Global Burden of Disease Study 2023, show that the number of people living with mental disorders has almost doubled since 1990, marking a 95% rise. Researchers say major depressive disorder and anxiety disorders have seen even sharper growth, increasing by 131% and 158% respectively, making them the most prevalent mental health conditions globally.
The report describes mental illnesses as widespread conditions that create long-term disability and significant human suffering. It also highlights broader consequences for economies and public services, including reduced productivity, lower workforce participation and increasing pressure on health and welfare systems.
Researchers estimate that in 2023 alone, around 620 million females and 552 million males were affected by mental health conditions. While the overall burden is rising across both sexes, the study points to notable differences in the types and prevalence of disorders.
Among women, depression and anxiety were the most commonly reported conditions, alongside higher rates of eating disorders such as anorexia nervosa and bulimia nervosa. The report links this disparity to a mix of biological, social and structural factors, including exposure to domestic violence, sexual abuse, gender inequality and reproductive health-related changes.
In contrast, neurodevelopmental and behavioural disorders, including attention deficit hyperactivity disorder (ADHD), conduct disorder and autism spectrum conditions, were more frequently diagnosed in men.
Teenagers aged 15 to 19 were identified as the group experiencing the highest mental health burden globally, raising concerns about early onset of conditions and insufficient preventive care for young people.
The study identifies several key risk factors associated with mental illness, including childhood sexual violence, bullying and intimate partner violence. These factors are strongly linked to conditions such as depression, schizophrenia, bipolar disorder and anxiety disorders. However, researchers note that such exposures have remained relatively stable over time and account for only a portion of the overall rise.
According to the authors, broader drivers are likely contributing to the increasing prevalence of mental disorders. These include genetic and biological influences, poverty, inequality, and the growing impact of global crises such as armed conflict, pandemics, natural disasters and climate-related stress.
While mental health conditions have long been a leading cause of disability worldwide, the report warns that the situation is worsening. At the same time, health systems have not expanded services at a pace matching demand.
The authors caution that the gap between rising need and limited access to care is becoming more pronounced, leaving millions without adequate treatment or support.
Health
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Health
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