Signs your antidepressant dose is too low—or too high

Signs your antidepressant dose is too low

While the right SSRI dose ultimately depends on the person, it may be too low if it’s not fully managing your symptoms, says Kate Hanselman, PMHNP and vice president of clinical psychiatry at Thriveworks.

In general, prescribers are aiming to find the perfect balance between symptom management and side effects. “We’re trying to maximize the benefit of the drug,” Dr. Werremeyer explains, “without bringing about undue burden to the person.” And this can take some trial and error.

Here’s what it typically looks like when an SSRI dosage is not meeting your individual needs—as well as what else might be going on.

You still have lingering symptoms.

This is the biggest sign you might need to increase your dose. That said, SSRIs take a month or two to start working, so if you just started an SSRI or upped your dose recently and don’t feel a difference yet, give it time. If you’ve been at the same dose for four to eight weeks and still aren’t noticing an improvement, that would indicate your dose is too low, Dr. Werremeyer says.

Remember, the goal is full symptom relief. “We’re not just looking to make one symptom better. We’re looking to make all of your symptoms lift,” Hanselman says. For instance, maybe your low mood has improved, but your fatigue, irritability, and motivation have not. Or maybe you’ve noticed some improvement with every symptom—but they’ve only gone down to a four out of ten, when you’re looking for a zero out of ten. “Either of those could indicate that you’ve got symptoms or symptom intensity remaining—and that we should turn [the dose] up and see if we can get more out of this medication,” Hanselman explains.

The thing to pay attention to is overall trends, Dr. Werremeyer says. Mood fluctuations are still normal, especially when someone is first starting out on SSRIs. “As people start to get better with antidepressants, it’s not a linear process most of the time,” she says. “So it’s not uncommon to feel like things are going really good for several days in a row, and then there’s a really bad day.” The key is whether you’re still seeing a trend of improvement over time.

Your symptoms were being managed, but now they’re back.

Sometimes a dose that’s been working well for months or years suddenly seems to start losing its effect. Depression symptoms can fluctuate in response to a ton of different factors, Hanselman says, like added stressors, major life transitions, age-related changes, and even shifts in weather and daylight. So an increase in depressive symptoms after a period of stability can often warrant a dose increase.

This can be a one-time thing or a cyclical change, like with patients who find they need to increase their dose during the winter months. “I see this frequently with a change in season,” Hanselman says.

When a too-low dose isn’t the problem (and what else could be going on)

Antidepressants can also stop working due to a specific, longer-term phenomenon that experts informally refer to as the “poop-out” effect. (Researchers call it “antidepressant tachyphylaxis.”) That’s when an antidepressant that’s provided real, sustained depression relief for months or years gradually (or even abruptly) stops working, Dr. Werremeyer explains. “I’ve probably seen hundreds of cases of it in my career.”

When this happens, “it usually means switching to a different antidepressant,” Dr. Werremeyer says. That tends to be more effective than upping the dose of the current med. (Interestingly, after six months to a year on a different medication, going back to the original one often works again, Dr. Werremeyer adds.)

Other times, it may be the wrong medication from the get-go. “If we get to the maximum dose that the FDA allows, and someone is still not noticing at least one thing about their depression that’s improved? Then that indicates that that drug is just not effective for them,” Dr. Werremeyer explains. There are many different reasons why this could be, most of them having to do with individual differences in brain chemistry and structure, she says. In this case, a different SSRI could do the trick.

In other cases, your provider may want to try adding an additional (non-SSRI) treatment on top, rather than increasing your dose. For example, if you’re at the maximum dose for an SSRI and you’ve experienced some but not full relief, your psychiatrist may want to add on another medication that works differently in your brain, such as bupropion (Wellbutrin) or an antipsychotic. (This doesn’t suggest you’re at risk of psychosis, Dr. Werremeyer clarifies—but the way antipsychotics work can help squeeze a little more juice out of the SSRI.) Other times, something like buspirone (Buspar) can help boost an SSRI’s effect on anxiety, Hanselman adds.

And sometimes it’s not a medication issue at all. Maybe your sleep habits have been pretty bad for the past month, and you’re noticing the effects on your energy and mood. “My recommendation is going to be that we get the sleep back on board first, and then see if we need to make shifts,” Hanselman says. In some cases, symptoms related to life stressors and events can be better treated with therapy than a higher dose. Therapy can equip you with coping skills and help resolve root trauma in a way meds do not, Hanselman points out. Or say you’re dealing with a death in the family—you likely need grief counseling, not a meds adjustment.

Signs your antidepressant dose is too high

When adjusting your SSRI dose, it’s also possible to overshoot the goal and end up at a dose that’s causing you negative effects. (That’s that “undue burden” psychiatrists are trying to avoid when determining your optimal dosage.) Here are the clearest signs your dose might be too high—plus other explanations for what could be going on.

Side effects that don’t go away or show up later.

Most people experience some initial side effects when starting an SSRI: restlessness, irritability, stomach upset, feeling drowsy or wired, trouble sleeping. “Those are common when someone first starts taking a med, and they usually go away,” Dr. Werremeyer says—typically within two to four weeks at a stable dose.

The problem is side effects that linger past this period. “If they’ve allowed enough time and those side effects haven’t dissipated, then that’s a sign that their dose is too high. Especially if those side effects are things that they just can’t see themselves living with over the long term,” Dr. Werremyer says.

Then there are side effects that tend to crop up later, usually after several months on the same dose: weight gain, sexual dysfunction, tremor, headaches, or insomnia. “Those are all things that, if they start to occur, they’re not likely to go away if we don’t do anything to address them,” Dr. Werremeyer says.

A dose decrease can sometimes relieve those symptoms. “But we always have to balance the decrease in the dose with the potential of losing control of the mood symptoms,” Dr. Werremeyer says. Instead, your provider may suggest keeping the dose steady and adding another medication to manage the side effect. (For example, a sleep medication could be prescribed to help with insomnia.) Another option is to switch to a different SSRI—though if your current medication is otherwise working well, this will also be weighed against the risk of tinkering with that, Dr. Werremeyer notes.

You feel emotionally “blunted” or numb.

This is another potential SSRI side effect that could signal you’ve gone past your maximum threshold for the drug. People sometimes describe having an emotional flatness or narrowing of their emotional range. Maybe your mood is better overall, but you have less access to joy or healthy tears. “[People] feel like they can’t cry or they can’t feel super happy when the situation calls for it,” Dr. Werremeyer says. For instance, you might notice yourself not laughing or crying at a movie that you used to, Hanselman says. “That’s not what we’re going for,” she says. “We want to support you to have a healthy range of emotions.”

One study of 669 people taking antidepressants for depression found that nearly half experienced emotional blunting. That said, emotional blunting can also be a symptom of lingering depression, so it’s not always a side effect of the medication.

“It’s very difficult to know if that is dose-related or not,” Dr. Werremeyer says, though sometimes lowering the dose will help. If you’re dealing with this side effect, talk to your provider about your other symptoms and side effects to determine if a dose adjustment or medication switch is warranted.

When a too-high dose isn’t the problem (and what else could be going on)

Occasionally, what looks like the wrong dose may actually be the wrong diagnosis. The most common scenario is someone who’s been diagnosed with and treated for depression but actually has bipolar disorder with episodes of depression. “When you have someone who has bipolar and you don’t know it yet, an SSRI actually can be really activating,” triggering episodes of mania or hypomania, Hanselman says.

Manic episodes can look like several days to a week of symptoms like not sleeping much, talking much faster than usual, high activity, irritability, extremely high energy, or euphoria, Dr. Werremeyer says. If you’re experiencing any of these symptoms after starting an antidepressant, let your provider know so they can reassess your treatment plan.

What to do if you think you need a dose change

The number one piece of expert advice here: Don’t adjust your SSRI dose on your own. Doing this can come with real risks, as well as missing out on expert insights that can help you figure out what’s really going on.

Stopping or decreasing an SSRI too quickly can trigger antidepressant discontinuation syndrome, Dr. Werremeyer points out. These are temporary but unpleasant symptoms (like anxiety, poor sleep, headaches, flu-like symptoms, and “brain zaps”). To avoid this, your doctor will guide you through a gradual taper and help you distinguish between discontinuation symptoms and signs of the depression recurring, Dr. Werremeyer says.

Increasing your dose on your own also comes with risks, like new or increased side effects, a small but real risk of overdose (especially if you go above the safe maximum dose), and unpredictable interactions with other medications, Dr. Werremeyer says.

Another reason to check in with your provider about your dose: they can provide a valuable perspective on your overall progress and what else might be going on. “We aren’t usually our own best narrators,” Hanselman says. For instance, she’s had patients convinced their medication isn’t working—only to look back at their symptom tracking and realize they’ve genuinely improved. Other times, what looks like a medication issue is actually grief, an anniversary date of when a major trauma occurred, or another stressor that needs its own kind of support.

How to prepare for the conversation

If you think you might be on the wrong SSRI dose, it helps to come to your appointment with specific details. “What are you specifically noticing about yourself, for how long, and how severe?” Dr. Werremeyer says. That kind of detail can help your provider tell the difference between a dose problem and something else going on in your life.

If possible, track your mood, symptoms, and side effects in a journal or app for a while if you’re noticing that something feels off. “Then when you share that with your provider, you can confidently say, ‘This has been happening for four weeks because I’ve been keeping track,’” Dr. Werremeyer explains.

That said, sometimes it’s hard to be clear-eyed about what’s going on with you, which is where your provider can offer perspective—especially if they’ve known you for a while. “They can help you work it through—really looking at what has changed, and why,” Hanselman says.

Frequently asked questions (FAQs)

How long does it take to know if your antidepressant dose is too low?

Most people need four to eight weeks on a stable dose to know whether it’s working. Small improvements as early as weeks three and four after starting an antidepressant are a good sign that you’re on the right track—the medication is working, and the dose might stay here or be brought up until you get full relief.

What’s the difference between an antidepressant not working and the dose being too low?

A dose that’s too low looks like some benefit and symptom relief showing up, just not enough yet. That suggests the medication is working, but a higher dose could offer more benefit. A medication that isn’t working means little or no benefit even at its maximum tolerated dose after a full six-to-eight-week trial, at which point Hanselman says it’s time to consider a different medication rather than a higher dose of the same one.

Can antidepressants stop working over time?

Yes. It’s called tachyphylaxis, or “poop-out,” and it can happen after months or years of an antidepressant working well. It isn’t predictable, and switching medications tends to work better than raising the dose of the same one.

Will a higher antidepressant dose cause more side effects?

Not always, but it’s possible. Side effects like weight gain, sexual dysfunction, tremor, and persistent insomnia are more likely to show up or intensify at higher doses, Dr. Werremeyer says. But the same can be well tolerated in one patient and lead to side effects in another, so it really depends on the individual.

Can you adjust your own antidepressant dose?

No, it’s not recommended. Self-adjusting in either direction comes with risks that your provider is positioned to help you avoid: symptoms returning, discontinuation symptoms, unexpected side effects, or drug interactions. Any change should be a conversation with the provider who’s tracking your progress.