Do Antidepressants Really Work?
For many people, yes. In large trials they beat placebo, though the gap is moderate and many people need more than one try.
By withClaro Editorial · Medically reviewed by Dr. Jason Tan , Consultant Psychiatrist · 2026-11-06 · 7 min read
Key takeaways In a 2018 review of 522 trials, all 21 antidepressants studied worked better than placebo, but the average gap is moderate. In trials sent to the FDA, about one in four people on a drug had a large response. On placebo, about one in ten did. The first antidepressant is often not the one that helps. In the STARD study, about a third reached remission on the first medication. In 100 Reddit threads, 231 of 433 people describing their own course said their antidepressant clearly helped. People tend to post when things go wrong. If one hasn't helped after a fair trial, the options are a dose change, a switch or an added medication. Your prescriber helps you choose. On this page
Do antidepressants work? Do antidepressants actually work, according to people on Reddit? Are antidepressants just a placebo? Who do antidepressants help most? How do you know if your antidepressant is working? Why might the first antidepressant not be the right one? What should you tell your prescriber if it isn't working? Keeping track of whether your antidepressant works Do antidepressants really work? For many people they do. In large trials they work better than placebo, and some people who get little from the first medication improve on the next. The gap over placebo is smaller than many people expect.
Do antidepressants work?
On average, yes, and the effect is real but moderate. A 2018 Lancet review pooled 522 trials, and all 21 antidepressants in it worked better than placebo. A 2022 BMJ analysis of 232 trials sent to the FDA measured how strongly people responded. STAR*D, a 2006 US study, followed people with depression through up to four treatment steps. Its total across all four steps was later disputed.
Study What it measured What it found Lancet review, 2018 21 antidepressants against placebo in 116,477 adults All 21 worked better than placebo BMJ analysis of FDA trials, 2022 How strongly 73,388 people responded Large response in 24.5% on a drug, 9.6% on placebo STARD, 2006 Remission over up to four treatment steps 36.8% on the first step, 67% across all four STARD reanalysis, 2023 Remission with the study's original measure 35% across all four steps, not 67%
The two FDA figures are linked. A large response was about 15 points more common on a drug than on placebo. Put simply, about 15 in 100 people had a large benefit that placebo alone doesn't explain.
Neuroscientist Dean Burnett, author of The Idiot Brain, gave a rough figure in a July 2026 episode of The Thinking Mind podcast. He said:
So it's really hard to say for certain, but I think it's something like two out of three uh people who take an uh an SSRI will experience some benefit from it.
Some benefit is a lower bar than remission, so the numbers measure different things. On the first STAR*D step, about a third reached remission on citalopram, an SSRI. If your first antidepressant hasn't helped, note how many weeks you've taken it. A prescriber will ask that first.
Do antidepressants actually work, according to people on Reddit?
More than half said their antidepressant clearly helped
We read 100 recent threads on r/antidepressants, r/SSRIs and the subreddits for single drugs, comments included. Between the posts and the replies, 433 people wrote about their own course on an antidepressant. More than half of them said it clearly helped, even with some bad days.
Where people were People Clearly better overall 231 Some symptoms better, or the benefit faded 79 Too early to tell 55 Gave it time, and it didn't help 43 Didn't say 25
Each person counts in one row only. People tend to post when something is going wrong, so threads like these lean toward the hard cases.
The middle group often described a split result, with mood or motivation better while anxiety stayed. One person on r/zoloft wrote:
I’m a week into my dose and it’s already made me a lot more motivated but my anxiety is still pretty crippling, does this ever get better?
For many in the first row, the change was plain once it came. One person on r/effexor wrote:
It took another few weeks but I feel better, joy and creativity have found their way back into my life and my derealization has pretty much vanished.
Of the 71 people who said what changed first, 34 named less anxiety. Better mood came next for 15, and a quieter mind with less rumination for 13.
Side effects in the first weeks came up for 79 people. Tiredness (17) and anxiety that got worse before it got better (16) were the most common named ones. If you are early on, write down what changes first and which side effects show up. Your next appointment then starts from facts.
Are antidepressants just a placebo?
No, but placebo explains a large part of the improvement people feel in trials. The debate took off in 2008 with a PLoS Medicine analysis of FDA data on four newer antidepressants. It found small average gaps over placebo.
The 2022 BMJ analysis of FDA trials adds a different angle. The average gap was small, 1.75 points on the Hamilton depression scale. But people did not improve along one smooth curve. They fell into three groups, with large, moderate or minimal improvement, and taking a drug made a large response more likely.
Some people do feel nothing, and one person on r/antidepressants put it this way:
I feel like many SSRI's don't help me. This medication could be a damn sugar pill. I've seen no difference in the months I've been on it
The trial average says little about your own response. You judge that by how you feel over time on a steady dose. A short daily note on mood, sleep and energy is the most useful evidence you can bring.
Who do antidepressants help most?
Antidepressants tend to help most when depression is severe. A 2010 JAMA analysis pooled data from 718 patients. On average, the benefit over placebo was minimal or absent for mild to moderate symptoms. For very severe depression, the benefit was substantial. That is an average across six trials, and some people with milder depression still respond well.
NIMH is the US National Institute of Mental Health. For milder depression, it says psychotherapy is often tried first, with medication added if therapy alone isn't enough.
If your symptoms are milder, ask your prescriber whether therapy, medication or both fits you. Agree on how you will judge whether it's working.
How do you know if your antidepressant is working?
Often the body notices before the mood does. NIMH says problems with sleep, appetite and concentration often improve before mood lifts. You may feel the full effect after 4 to 8 weeks. On Reddit the order looked different: less anxiety was the change people named first most often, not sleep or appetite. In both, though, mood was often not the first thing to shift.
One person on r/SSRIs wrote:
I'm on a low starting dose, but already I notice my brain is significantly quieter. I can get on with my day and function much better without unhelpful thoughts repeating in my mind.
Signs that are easy to miss include sleeping through the night, small tasks feeling possible again and worries looping less. On Reddit, many who said it clearly helped still had some bad days. For what tends to happen and when, see what to expect in the first weeks on an antidepressant .
Why might the first antidepressant not be the right one?
Many people need more than one try. In STAR*D, each new step helped some people who had not reached remission before. Remission came for 30.6% on the second step, then 13.7% and 13.0% on the third and fourth. NIMH calls depression treatment resistant only after someone has tried at least two antidepressants without getting better.
No antidepressant is the strongest for everyone, and the right one is often found by trying.
In large comparisons most antidepressants work similarly on average, with only modest differences between them. They differ more in side effects, interactions and how hard they are to stop. Needing a second choice does not mean the first was a mistake.
Prescribers look at your main symptoms, other conditions, other medications and past response, yours or a close relative's. Some antidepressants are more activating and others more sedating, which can be matched to problems with sleep or energy.
If a medication has not helped enough after a fair trial, the options include:
adjusting the dose switching to another medication in the same class switching to a different class adding a second medication Medical review Medically reviewed by Dr. Jason Tan, Consultant Psychiatrist, on 27 October 2026, this section only. Next review: 27 October 2027.
A fair trial means enough time on a dose that suits you, and your prescriber judges both. If the next step is a new medication, how switching antidepressants works explains what that change involves.
What should you tell your prescriber if it isn't working?
Bring specifics, not only the sense that it isn't working. Your prescriber chooses between a dose change, a switch or an added medication. That choice rests on how long you've been on this dose and what has changed. Notes from the past few weeks make the decision easier and faster.
It helps to tell them:
How many weeks you have been on your current dose. What has changed and what hasn't: sleep, energy, appetite, anxiety, mood. Side effects, and whether they're fading or staying the same. Any missed doses, and how often. How much you drink, and any other substances you use. Antidepressants you took before and how they went, or how one worked for a close relative. If you feel worse or more restless, or have new dark thoughts, call your prescriber right away and don't wait for the appointment. NIMH advises talking to a health care provider before starting or stopping any medication. If you're having thoughts of harming yourself, contact emergency services or a crisis line straight away. In the US, call or text 988. In the UK, call Samaritans on 116 123. Elsewhere, find a crisis line near you .
Keeping track of whether your antidepressant works
A few weeks of short daily notes show a pattern that memory tends to blur. Rate your mood, energy and sleep each day, and note side effects and any missed doses. Bring the notes, or a summary of them, to your next appointment.
The withClaro app lets you log mood, energy, sleep and appetite each day. It links side effects to your dose and turns the record into a report for your prescriber.
Download on the App Store Whether a medication is helping shows up slowly, often in sleep and energy before mood. The withClaro app lets you log mood, energy, sleep and appetite each day, track side effects against your dose and share a report with your doctor.
Frequently asked questions What are the benefits of taking antidepressants? For people they help, low mood, anxiety, poor sleep and loss of interest ease, and daily tasks get easier. Ask your prescriber which change to look for first, and note it when it shows up.
Why do antidepressants not work for some people? The first one tried is often not the one that helps. If one hasn't helped enough after a fair trial, options include adjusting the dose, switching or adding a second medication. If yours hasn't helped, bring your notes on time, dose and changes to your prescriber.
Do antidepressants work for situational depression? For milder depression, NIMH says psychotherapy is often tried first, with medication added if therapy alone isn't enough. Low mood can follow a hard event, like a breakup or a loss. If it lasts and gets in the way of daily life, ask a doctor to assess it.
What do antidepressants feel like when they work? People often describe things getting quieter: less worry, more energy for small tasks, sleep that settles. Note small changes as they happen, since they are easy to miss without a record.
What percentage of people do antidepressants work for? It depends on how you measure it. In FDA trials, about one in four people on a drug had a large response. On placebo, it was about one in ten. In STARD, about a third reached remission on the first medication. Ask your prescriber how you will measure progress together.
Can depression go away without medication? For some people, yes. NIMH says psychotherapy is often tried first for milder depression. Tell your prescriber or therapist how long your symptoms have lasted and how much they affect your days.
Related articles
Sources Cipriani A, et al. Comparative efficacy and acceptability of 21 antidepressant drugs for the acute treatment of adults with major depressive disorder. Lancet, 2018 Stone MB, et al. Response to acute monotherapy for major depressive disorder in randomized, placebo controlled trials submitted to the US FDA. BMJ, 2022 Rush AJ, et al. Acute and longer-term outcomes in depressed outpatients requiring one or several treatment steps: a STAR*D report. American Journal of Psychiatry, 2006 Pigott HE, et al. What are the treatment remission, response and extent of improvement rates after up to four trials of antidepressant therapies in real-world depressed patients? A reanalysis of the STAR*D study. BMJ Open, 2023 Dean Burnett on The Thinking Mind podcast. Key Moment: What We Get Wrong About Depression (and Anti-Depressants), July 15, 2026 Kirsch I, et al. Initial severity and antidepressant benefits: a meta-analysis of data submitted to the Food and Drug Administration. PLoS Medicine, 2008 Fournier JC, et al. Antidepressant drug effects and depression severity: a patient-level meta-analysis. JAMA, 2010 National Institute of Mental Health. Depression, NIH Publication No. 24-MH-8079, revised 2024 Claro articles are for self-monitoring and educational purposes only. They are not a medical device, therapist, or diagnostic tool, and do not replace care from your prescribing clinician. If you are in crisis, contact your care team, emergency services, the Samaritans (UK: 116 123), or the Crisis Text Line (US: text HOME to 741741).
