Nearly nine million people in England, representing approximately one in six of the population, were prescribed antidepressants in the past year, according to recent figures. While these medications have been widely recognized for their effectiveness in treating depression and anxiety by increasing serotonin levels in the brain, the duration of use has extended significantly over time. Official data indicate that about half of those prescribed antidepressants have been taking them for more than two years, with around two million individuals using the drugs for over five years.
The long-term use of antidepressants remains a subject of ongoing debate among healthcare professionals. For individuals suffering from severe depression—which affects around one in 20 adults—extended treatment can be crucial in reducing the risk of relapse and suicide. Additionally, antidepressants are employed to manage other conditions such as sleep disorders, post-traumatic stress disorder, and chronic pain. However, there is a growing concern about the unknown risks associated with prolonged consumption of these medications.
Recent studies suggest that extended antidepressant use may be linked to a range of serious side effects, including cardiovascular issues—such as sudden cardiac death—weight gain, decreased bone density leading to fractures, sexual dysfunction, type 2 diabetes, and cognitive decline, including dementia. Although a definitive causal relationship between these adverse effects and antidepressant use has not been established, experts caution that the possibility warrants careful consideration.
Professor Joanna Moncrieff, a psychiatrist at University College London and a critic of psychiatric medication, recently contributed to a review examining the side effects of long-term antidepressant use. The yet-to-be-published study focused on individuals taking antidepressants for more than one year and identified associations with type 2 diabetes, weight gain, and increased risk of falls and fractures among older populations. Moncrieff emphasized the limited quality and quantity of existing research on this topic, stating that the safety profile of prolonged antidepressant use remains unclear and advocating for shorter treatment durations where possible.
Similarly, Dr. Sameer Jauhar of Imperial College London highlighted that different antidepressants may exert varying long-term impacts, particularly on cardiac health, and suggested that these considerations should inform prescribing decisions by clinicians.
Current guidelines from the National Institute for Health and Care Excellence (NICE) recommend that patients contemplate stopping antidepressants after a minimum of six months following significant symptom improvement. For recurrent depression, treatment may be extended for two years or longer. However, these guidelines provide limited information regarding the risks associated with protracted use.
Evaluating the side effects is complicated by the fact that depression itself is linked to elevated risks of heart disease, stroke, type 2 diabetes, obesity, and dementia. Symptoms such as low motivation and lethargy can hinder healthy lifestyle choices, while underlying inflammatory processes associated with depression may contribute to chronic conditions. This complexity makes it challenging to distinguish whether adverse outcomes arise from medication use or the disorder itself.
Professor Glyn Lewis of University College London noted that many studies connecting antidepressants with long-term health issues are observational in nature. While such research can identify correlations, it does not establish causation. Nonetheless, he acknowledged the importance of ongoing scrutiny in this area.
As the prevalence of long-term antidepressant use grows, healthcare providers and patients face a challenging balance between the benefits of sustained treatment and potential health risks, underscoring the need for further research and individualized clinical judgment.