No, a high dose of SSRI doesn’t mean you’re “more depressed”

Does a higher SSRI dose mean you're more depressed?

The short answer is no. In reality, different SSRI doses work for different people based on a variety of factors.

“That is definitely a misconception,” says Amy Werremeyer, Pharm.D., professor and chair of the Department of Pharmacy Practice at North Dakota State University. You can’t determine how serious someone’s depression is based on their SSRI dose. “Just because someone’s depression is mild doesn’t mean they wouldn’t potentially need a high dose,” Dr. Werremeyer says. On the other end of the spectrum, “someone who has severe depression might get improvement with a low dose,” she adds.

The false correlation between depression level and antidepressant level is pretty understandable. “It makes complete sense to me that there is some confusion around the relationship between dosing and severity,” says Kate Hanselman, PMHNP and vice president of clinical psychiatry at Thriveworks.

The problem is we tend to assume that SSRIs work like many other meds, explains Hanselman: More serious symptoms = more medication. For example, we’re used to the idea that if you have a little bit of pain, you might take 200 milligrams of ibuprofen, whereas you might take 600 mg for severe pain. “But that is not the case for psych meds in general,” Hanselman says, including SSRIs. The real picture is much more complex.

What actually determines someone's SSRI dose

The correct amount of an SSRI for you is the one that you respond well to. “The dose of the antidepressant is generally individualized to how the person is doing on the medication,” Dr. Werremeyer says. Specifically, prescribers are looking for the precise dose that is both effective (relieves your depression symptoms) and well-tolerated (doesn’t cause side effects), Hanselman adds.

The way someone responds to a particular medication ultimately depends on what’s going on in that person’s brain, body, and life. As Hanselman puts it: “When we think about finding the right dose for somebody, the most important variable there is the somebody.” Here are a few specific variables they’ll consider:

Where you are in the dose-adjustment process

Nearly everyone starts an antidepressant at a low dose, Dr. Werremeyer says, regardless of the severity of their depression. “That allows the brain and body to more gradually get accustomed to any potential side effects that could occur,” she says.

From there, your prescriber may keep you on that dose if you respond well, or increase it until you’re getting the desired symptom relief with no (or minimal) side effects, Hanselman explains, or until you hit the maximum dose.

The dose titrating process is more of an ongoing conversation between you and your prescriber rather than a one-time decision, Hanselman says. “We consistently evaluate: Are you at the dose that we want right now? Because that could change over time.”

Your unique brain chemistry

It might surprise you to learn that how your brain responds to an SSRI is not really about how depressed you are. “It most likely has a lot more to do with an individual’s brain makeup,” Dr. Werremeyer says. SSRIs interact with your brain’s serotonin receptors. The concentration of those receptors can vary pretty widely from one person to the next. “You can see a lot of differences in the number of receptors, and even sometimes the location in different brain regions,” Dr. Werremeyer says.

Interestingly, the concentration of serotonin receptors in someone’s brain “generally doesn’t correlate a whole lot with whether their depression is severe or mild or somewhere in between,” Dr. Werremeyer says. But the variability in these receptors—the places where the meds need to land to do their job—does make it hard to predict how much impact a given dose will have on someone.

Scientists have observed through brain imaging how much the serotonin levels in someone’s brain increase with a certain dose of antidepressant. “Most of the time, it’s not linear,” Dr. Werremeyer says. Meaning that a higher SSRI dose doesn’t reliably produce a higher level of serotonin in the brain. “That’s part of why a larger dose doesn’t necessarily always deliver a larger punch,” Dr. Werremeyer explains. And why one person might need a higher dose than another to achieve a similar effect.

On top of that, higher and higher levels of serotonin don’t necessarily benefit depression more and more. “OCD is really the only condition that we know has a pretty strong correlation, where the further you increase the amount of serotonin in the brain, the more likely you are to get a benefit,” Dr. Werremeyer says. “Depression is less clear that way.”

How fast your body metabolizes medication

Genetic variations cause people to have different levels of certain enzymes that help the body process antidepressants. Metabolizing a drug more quickly also means it leaves your system more quickly, leading to lower concentrations of the drug in your brain and body. This could potentially mean needing a higher dose to achieve a similar level of effect to someone with fewer of those enzymes. (That said, the science isn’t clear enough to say fast metabolizers necessarily benefit from a higher dose, Dr. Werrenmeyer notes.)

Your lifestyle and mental health support

As much as your internal makeup determines the best SSRI dose for you, “The whole picture isn’t just brain chemistry,” Hanselman says. Other variables—like your support system, your stress level, your sleep, and your overall health—can also have an effect on how you respond to mental health medications. “Those environmental factors can have a huge influence on people’s well-being,” Hanselman says.

Then there’s therapy. Therapy can equip you with self-care tools and coping skills, as well as target unresolved trauma that is sometimes a root cause of depression, Hanselman says. Research shows that therapy can even change the way your brain responds to stress and emotions. “You may then end up feeling like you want to turn your dose down later if your brain is just working differently,” she says.

Other medications

Sometimes, other medications you’re taking can impact your SSRI dose. For instance, buspirone (Buspar), sometimes added into a treatment plan to address anxiety, works somewhat similarly to SSRIs, Dr. Werremeyer says. “So we might be able to theorize that a lower antidepressant dose could then be needed to get the same effect,” she says.

Another example: The seizure medication carbamazepine speeds up how quickly your body metabolizes many drugs, Dr. Werremeyer says. That may mean needing a higher dose of an SSRI to achieve the same drug concentration and effect.

Which SSRI you’re taking

You might look at your friend’s 60 mg dose of Prozac, compare it to your 150 mg of Zoloft, and assume you’re on a much stronger dose of antidepressant. But you can’t really compare two different SSRIs to each other when it comes to dosing.

“The SSRIs are very different chemical compounds from each other,” Dr. Werremeyer explains. “They have different chemical shapes, different chemical structures, and some degree of different chemical activity.” Each medication’s approved dosing range comes from years of research into how a drug behaves in the brain and body, she notes.

The chart below will give you a rough idea of the different dosing ranges for some common SSRIs. But remember not to assign any positive or negative meaning to where your dose falls in a given range. “All it means is that 20 milligrams is the amount of Lexapro that’s helping you, and it’s tolerable,” Hanselman says. In some cases, people do well outside the typical range entirely, Hanselman adds. That’s why questions or concerns about your SSRI dose are always best addressed by your provider.

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Note: In some cases, certain drugs (like Fluoxetine or Paroxetine) can be used in higher doses than what’s listed here to treat other conditions (like OCD or panic disorder).

How to know if it's time to increase your SSRI dosage

The decision to change your SSRI dose is one only you and your prescriber can make based on your individual situation and circumstances. That said, there are a few signs that generally point toward someone benefitting from a dose increase, as Dr. Werremeyer explains:

• You’ve improved, but not fully. Feeling somewhat better—but not all the way better—after six to eight weeks on the same dose is one of the clearest signs that upping your dose could help.
• Old symptoms are creeping back in. A gradual return of mild-to-moderate depression symptoms that had previously eased off or disappeared is another good indicator.
• You’ve started taking something that speeds up how your body clears the medication. Adding an interacting medication or supplement (like the seizure drug carbamazepine or even some herbal supplements) can cause your body to eliminate an SSRI faster. That means your existing dose may no longer go as far.

None of these signs automatically mean the next step is more medication. There are a couple factors worth weighing first, Dr. Werremeyer says. One is tolerability: If you’re already facing difficult side effects on the current dose of your antidepressant, going higher is likely not a good idea.

The other is context. Sometimes, when specific circumstances are contributing to worsening depression symptoms—like job loss, relationship stress, or a big life transition—supplementing with a different kind of treatment might work better than increasing your dose. “Non-pharmacologic approaches, like working with a counselor or therapist, to treat the worsened symptoms may be more effective,” Dr. Werremeyer says.

How to know if you should lower your SSRI dosage

On the flip side, there are a couple of situations where it may be time to lower your SSRI dose, according to Dr. Werremeyer:

• You’re dealing with side effects. If you’ve been at a steady dose for at least two weeks and are still experiencing unpleasant side effects, you may need a lower dose to get relief.
• You’ve started a medication that slows down your body’s clearing of the SSRI. Adding certain medications or supplements—such as modafinil (prescribed for sleep disorders) or CBD—can reduce how quickly your body eliminates an SSRI. This effectively raises the amount of the drug circulating in your system at your current dose.
• You’re interested in stopping the medication. If you and your provider have decided that stopping an SSRI is the best choice, you’ll need to taper off slowly with increasingly smaller doses.

Keep in mind that changing an SSRI dose is never a decision to make lightly or by yourself—you always want to keep your prescriber in the loop. “It’s really important to have the conversation before cutting a dose on one’s own,” Dr. Werremeyer says. Lowering your dose comes with the risk of temporary but unpleasant withdrawal side effects, as well as depression symptoms returning—both of which your prescriber can help you monitor. They can also talk you through the decision and create a plan for a dose taper.

Frequently asked questions (FAQs)

Why did my doctor increase my SSRI dose?

Typically because your current dose isn’t fully controlling your symptoms and you’re tolerating the medication well. Prescribers generally increase a dose gradually until they see the most benefit, hit the maximum approved dose, or reach a point where side effects outweigh any additional gain.

Does increasing my dose mean my medication isn’t working?

More like your medication is not working well enough, yet. A dose increase often means your prescriber is still finding the level that works best for your specific biology and response. This process is a normal and expected part of starting most SSRIs.

Is 100 mg of sertraline (Zoloft) a high dose?

It’s within the typical range. Sertraline dosing ranges from 50 mg to 200 mg a day, so 100 mg is pretty average.

Do higher doses of SSRIs work better?

No, not necessarily. It depends on the individual and how they respond to different levels of that particular antidepressant. (The exception is taking SSRIs for OCD, which tends to respond better to higher doses.)

Can I lower my dose on my own if I’m feeling better?

Talk to your prescriber first. Adjusting your meds without medical guidance is never a good idea, since a lower dose can trigger uncomfortable withdrawal-like symptoms or even lead to a depression relapse.