NIHR | March 2022 | Almost half those on long-term antidepressants can stop without relapsing
The National Institute for Health Research (NIHR) provides a bite-sized summary of research into antidepressants and longer-term use
Taking long-term antidepressants can prevent depression recurring (relapse). But new research shows that almost half those who stop taking the medication do not relapse.
Depression is a major cause of ill health and disability worldwide. It causes emotional distress and interferes with everyday life. Many people with depression continue taking antidepressant drugs for months or even years after their symptoms have resolved. This so-called maintenance therapy aims to reduce the risk of relapse.
The numbers of people taking maintenance therapy for depression is increasing. However, there is little research to show how effective these drugs are in preventing relapse in people who have been taking them long-term.
This study included people who had two previous relapses of depression. Researchers compared rates of relapse in those who continued on antidepressants with those who stopped. They found that people who stopped medication were more likely to relapse. However, more than 4 in 10 people who stopped taking antidepressants had no relapse of their depression (Source: NIHR).
The Alert is available in full from NIHR
The original piece of research upon which this summary is based, is available from the NIHR’s Journals Library
Duffy L, Clarke CS, Lewis G, Marston L, Freemantle N, Gilbody S, et al. (2021). Antidepressant medication to prevent depression relapse in primary care: the ANTLER RCT. Health Technol Assess ;25(69). https://doi.org/10.3310/hta25690
Abstract
Background
There has been a steady increase in the number of primary care patients receiving long-term maintenance antidepressant treatment, despite limited evidence of a benefit of this treatment beyond 8 months.
Objective
The ANTidepressants to prevent reLapse in dEpRession (ANTLER) trial investigated the clinical effectiveness and cost-effectiveness of antidepressant medication in preventing relapse in UK primary care.
Design
This was a Phase IV, double-blind, pragmatic, multisite, individually randomised parallel-group controlled trial, with follow-up at 6, 12, 26, 39 and 52 weeks. Participants were randomised using minimisation on centre, type of antidepressant and baseline depressive symptom score above or below the median using Clinical Interview Schedule – Revised (two categories). Statisticians were blind to allocation for the outcome analyses.
Setting
General practices in London, Bristol, Southampton and York.
Participants
Individuals aged 18–74 years who had experienced at least two episodes of depression and had been taking antidepressants for more than or equal to 9 months but felt well enough to consider stopping their medication. Those who met an International Statistical Classification of Diseases and Related Health Problems, Tenth Revision, diagnosis of depression or with other psychiatric conditions were excluded.
Intervention
At baseline, participants were taking citalopram 20 mg, sertraline 100 mg, fluoxetine 20 mg or mirtazapine 30 mg. They were randomised to either remain on their current medication or discontinue medication after a tapering period.
Main outcome measures
The primary outcome was the time, in weeks, to the beginning of the first depressive episode after randomisation. This was measured by a retrospective Clinical Interview Schedule – Revised that assessed the onset of a depressive episode in the previous 12 weeks, and was conducted at 12, 26, 39 and 52 weeks. The depression-related resource use was collected over 12 months from medical records and patient-completed questionnaires. Quality-adjusted life-years were calculated using the EuroQol-5 Dimensions, five-level version.
Results
Between 9 March 2017 and 1 March 2019, we randomised 238 participants to antidepressant continuation (the maintenance group) and 240 participants to antidepressant discontinuation (the discontinuation group). The time to relapse of depression was shorter in the discontinuation group, with a hazard ratio of 2.06 (95 per cent confidence interval 1.56 to 2.70; p less than 0.0001). By 52 weeks, relapse was experienced by 39 per cent of those who continued antidepressants and 56 per cent of those who discontinued antidepressants. The secondary analysis revealed that people who discontinued experienced more withdrawal symptoms than those who remained on medication, with the largest difference at 12 weeks. In the discontinuation group, 37 per cent (95 per cent confidence interval 28 per cent to 45 per cent) of participants remained on their randomised medication until the end of the trial. In total, 39 per cent (95 per cent confidence interval 32 per cent to 45 per cent) of participants in the discontinuation group returned to their original antidepressant compared with 20 per cent (95 per cent confidence interval 15 per cent to 25 per cent) of participants in maintenance group. The health economic evaluation demonstrated that participants randomised to discontinuation had worse utility scores at 3 months (–0.037, 95 per cent confidence interval –0.059 to –0.015) and fewer quality-adjusted life-years over 12 months (–0.019, 95 per cent confidence interval –0.035 to –0.003) than those randomised to continuation. The discontinuation pathway, besides giving worse outcomes, also cost more [extra £2.71 per patient over 12 months (95 per cent confidence interval –£36.10 to £37.07)] than the continuation pathway, although the cost difference was not significant.
Conclusions
Patients who discontinue long-term maintenance antidepressants in primary care are at increased risk of relapse and withdrawal symptoms. However, a substantial proportion of patients can discontinue antidepressants without relapse. Our findings will give patients and clinicians an estimate of the likely benefits and harms of stopping long-term maintenance antidepressants and improve shared decision-making. The participants may not have been representative of all people on long-term maintenance treatment and we could study only a restricted range of antidepressants and doses. Identifying patients who will not relapse if they discontinued antidepressants would be clinically important.