How Long to Stay on Antidepressants: The Phases of Treatment and When to Consider Stopping
How long to stay on antidepressants depends on your history. Learn the phases of treatment, what favors longer use, and how to plan a safe taper.
You filled the prescription, you've taken it every day for ten days, and nothing feels different. If you're asking, "How long do antidepressants take to work?" you're in good company, and this is often the moment people decide a medication has failed. Knowing the real timeline can make the first two months easier and keep you from stopping a medication that was about to help.
Key takeaways
- Most antidepressants take four to eight weeks to reach their full effect, according to the National Institute of Mental Health.
- Sleep, appetite, energy and concentration often improve before mood does.
- Side effects tend to show up in the first one to two weeks, before the benefits.
- Week eight is not a hard cutoff. Many people who improve do so at or after that point.
- If the first medication doesn't help, there are good next options. Always talk with your prescriber before starting, stopping or changing any medication.
If you're struggling right now: If you have thoughts of harming yourself, call or text 988 to reach the Suicide and Crisis Lifeline. Call 911 in an emergency, or text HOME to 741741. You can find more options on our crisis resources page.
How long do antidepressants take to work? The short answer
The National Institute of Mental Health puts the window at four to eight weeks for antidepressants to take full effect. That timeline assumes you're at an effective dose, which you may not reach on day one. Prescribers often start low and increase gradually to limit side effects, so the clock may really start a couple of weeks after your first pill.
Research supports the longer end of that range. In the STAR*D study, a large real-world antidepressant study in the United States, the average time to response was 5.7 weeks and the average time to remission was 6.7 weeks. A separate analysis of antidepressant trials found response rates of 42% at four weeks, 55% at eight weeks and 59% at 12 weeks. Improvement keeps building well past the one-month mark.
What improves first, and why it can feel backward
The symptoms that lift first are usually physical. Sleep often settles. Appetite returns. Energy picks up, and concentration sharpens enough that you can follow a conversation or finish a task.
Mood usually comes last. That surprises people, because mood is often the reason they started treatment.
This stretch can be hard. Having more energy while still feeling hopeless can feel worse than having neither, and it's a time when prescribers watch closely. If your mood drops, your thinking turns darker, or you have thoughts of harming yourself at any point after starting a medication, call your prescriber the same day.
Timeline by type of antidepressant
Here's a general picture of how the main types compare.
| Type | Examples | What people may notice early |
|---|---|---|
| SSRIs | sertraline, escitalopram, fluoxetine, citalopram, paroxetine | Symptoms may begin improving in two to four weeks, with full benefit taking longer |
| SNRIs | venlafaxine, duloxetine, desvenlafaxine | Some people notice energy and focus change in the first couple of weeks |
| Bupropion | bupropion | Some people report better energy and motivation within two weeks |
| Mirtazapine | mirtazapine | Sleep and appetite often change within the first few nights |
SSRIs
Selective serotonin reuptake inhibitors are the most commonly prescribed first option. Mayo Clinic notes that SSRIs may take two to four weeks for symptoms to begin improving. Fluoxetine stays in the body longer than the others, so it builds up more gradually.
SNRIs
Serotonin and norepinephrine reuptake inhibitors follow a similar four-to-eight-week timeline. Duloxetine is often chosen when depression comes with chronic pain, and the pain benefit can arrive on its own schedule.
Bupropion
Bupropion works on dopamine and norepinephrine rather than serotonin, and it is less likely to cause sexual side effects or weight gain.
Week by week: what to expect
Weeks one and two
Side effects, if you get them, usually show up here. Nausea, headache, loose stools, drowsiness or feeling wired are common, and most fade as your body adjusts. Benefits are rare this early, though some people notice sleep changing.
Weeks three and four
This is when the first real signals often appear. You might sleep through the night, eat more normally or get through a workday without your focus slipping. Your mood may still feel flat, and that's expected.
Weeks five and six
This is when many people who respond start to notice it. Something that would have flattened you last month might only bother you now.
Weeks seven and eight
This is a common decision point. If you've improved partway, your prescriber may suggest adjusting the dose rather than switching. Partial improvement is a reason to keep talking with your prescriber, not a reason to start over.
Why week eight isn't the finish line
The eight-week mark often gets treated as a verdict, but it shouldn't be. In STAR*D, about 40% of participants who reached remission got there at or after week eight.
The trial analysis above found something similar. About one in five people with no improvement at four weeks went on to respond when they stayed on the medication longer. If they had stopped early, they might have walked away from something that was going to work.
Side effects usually arrive before benefits
Nausea can show up in week one, while relief may not arrive until week six.
Most early side effects settle within the first couple of weeks, and several have simple fixes. One of the first things a prescriber may look at is the time of day you take your medication. Taking it with food can also help with nausea.
The key is to tell your prescriber instead of putting up with it or stopping on your own. Side effects are one of the most common reasons people stop a medication early, and many of them can be managed.
When to contact your prescriber sooner
Don't wait for the four-week mark if you notice any of these:
- New or worsening thoughts of suicide or self-harm
- Agitation, restlessness or racing thoughts you haven't had before
- A sudden lift into unusually high energy, less need for sleep or rapid speech
- Rash, swelling or trouble breathing
- Confusion, high fever, muscle stiffness or shivering
- Side effects bad enough that you're thinking about stopping
If the first medication doesn't work
Needing a second option is common. In STAR*D, fewer than a third of participants reached remission on their first medication, so most needed at least one change. That reflects how hard it is to predict one person's response. It isn't a failure on your part.
Common next steps include adjusting the dose, switching medications or adding a second one. Our guide on what to do when antidepressants don't work covers the common reasons and next steps.
GeneSight testing can also help guide the next choice. It looks at how your body may process specific medications. It won't name the one that will work, but it can help narrow the field.
For people who have tried several medications without enough relief, there are other treatments that work in different ways. Our team can help you understand whether they're worth exploring and where to find them.
Frequently asked questions
Can I tell in the first week if my antidepressant is working?
Usually not. The first week tends to bring side effects rather than benefits, and early changes are more likely to show up in sleep or appetite than mood. A quiet first week doesn't mean the medication failed.
What should I do if I feel worse after starting an antidepressant?
Call your prescriber rather than waiting for your next appointment. Feeling more restless or anxious in the first couple of weeks can happen, and a change in dose or timing often helps. If your mood drops sharply or you have thoughts of harming yourself, call or text 988.
Will a higher dose make it work faster?
Not reliably. A dose change can improve how well a medication works for some people, but it doesn't shrink the four-to-eight-week window. Any dose change should come from your prescriber.
How long do I need to stay on an antidepressant once it works?
Guidelines often suggest continuing for at least six to 12 months after you feel better, and longer if you've had more than one episode. Stopping as soon as you feel well raises the risk of symptoms coming back. Make this decision together with your prescriber.
Get support through the waiting period
Four to eight weeks is a long time to wait without guidance. At Musec Medical, our psychiatrist and psychiatric physician assistants check in during those early weeks so side effects and dose questions get handled as they come up. We see patients in person in Chicago and by telehealth anywhere in Illinois. Request an appointment to get started.
