The lowest manufactured dose of Lexapro (escitalopram) is a 5 mg tablet. This is the smallest pill strength approved by the FDA, though it sits below the standard starting dose of 10 mg that most prescriptions begin with. In practice, 5 mg serves as a stepping stone for people who are sensitive to medication side effects, and some prescribers go even lower by splitting tablets or using a liquid formulation.
Available Tablet Strengths
Lexapro comes in three tablet strengths: 5 mg, 10 mg, and 20 mg. The 10 mg and 20 mg tablets are scored, meaning they have a line down the middle for easy splitting. The 5 mg tablet is the smallest you can get from the pharmacy without any modification.
There is also an oral solution formulated at 1 mg per milliliter. This liquid version allows for very precise dosing in increments smaller than any available tablet. If your prescriber wants you on 2.5 mg or 7.5 mg, the liquid makes that straightforward. That said, the oral solution is not always readily available at pharmacies.
How 5 mg Compares to the Standard Dose
For both major depression and generalized anxiety disorder, the recommended starting dose is 10 mg once daily. That’s also the target dose for many people, since clinical benefit often begins there. The maximum is 20 mg per day.
So 5 mg is half the standard starting dose. It’s not typically considered a full therapeutic dose on its own for most adults, but it’s far from inactive. Brain imaging research shows a clear relationship between escitalopram dose and its effect on serotonin transporters, the proteins in the brain it’s designed to block. Even at lower blood concentrations, there is measurable activity. Some people do respond to 5 mg alone, particularly those who are naturally more sensitive to medications or who metabolize them more slowly.
Why Prescribers Start at 5 mg
Starting below the standard 10 mg dose is a common strategy to reduce early side effects. Nausea, headache, insomnia, and increased anxiety can all flare during the first week or two on an SSRI. Beginning at 5 mg for a week before stepping up to 10 mg gives your body time to adjust, often making those startup effects milder and more tolerable.
This approach is especially common for people with anxiety disorders, who tend to be more sensitive to the initial activation that SSRIs can cause. It’s also used for anyone who has had trouble tolerating antidepressants in the past or who is generally sensitive to new medications.
Doses for Older Adults and Liver Conditions
For adults over 65, the FDA recommends 10 mg as both the starting and maximum dose. Older adults clear the drug from their body more slowly, so the same dose produces higher blood levels. They’re also at greater risk for low sodium levels, a side effect that becomes more likely at higher doses.
People with liver impairment face a similar situation. Because the liver is responsible for breaking down escitalopram, reduced liver function means the medication stays in the body longer. The recommended dose for most people with liver disease is also 10 mg. Prescribers may start these patients at 5 mg to be cautious.
Genetic Factors That Affect Dosing
Your body breaks down escitalopram primarily through a liver enzyme called CYP2C19. Some people carry gene variants that make this enzyme work slowly or not at all. These “poor metabolizers” end up with significantly higher drug levels from the same dose compared to someone with normal metabolism.
Clinical pharmacogenetics guidelines recommend that poor metabolizers start at a lower dose, increase more gradually, and aim for roughly half the standard maintenance dose. If you’ve done pharmacogenetic testing and learned you’re a poor metabolizer of CYP2C19, a 5 mg dose may actually produce blood levels similar to what a normal metabolizer gets from 10 mg.
Going Below 5 mg
Some people take doses below 5 mg, typically 2.5 mg. This isn’t a standard therapeutic dose, but it comes up in two situations. The first is an ultra-cautious start for very sensitive patients, spending a few days at 2.5 mg before moving to 5 mg and then 10 mg. The second is tapering off the medication.
When discontinuing Lexapro, gradual dose reduction helps prevent withdrawal symptoms like dizziness, irritability, brain zaps, and flu-like feelings. A common tapering approach reduces the dose in 5 mg increments, spending at least a week at each step. For someone on 10 mg, that means dropping to 5 mg for a week or more before stopping. Some people benefit from an additional step down to 2.5 mg, which can be achieved by splitting the 5 mg tablet or using the liquid formulation. Clinical tapering guidelines list 5 mg as the minimum effective dose increment for escitalopram, but going smaller is sometimes necessary for a comfortable discontinuation.
What This Means in Practice
If you’re starting Lexapro and your prescriber has written for 5 mg, it typically means you’re beginning at a deliberately gentle dose with a plan to increase. It’s not the dose most people stay on long term, but it’s a reasonable and common starting point. If you’ve been on 5 mg for several weeks and feel well, some people do remain there, particularly if they metabolize the drug slowly or have mild symptoms.
The key thing to know is that 5 mg is the lowest commercially available tablet, 10 mg is the standard therapeutic target for most adults, and doses below 5 mg are achievable with tablet splitting or the liquid form when a prescriber feels it’s appropriate. Your ideal dose depends on your age, liver function, genetic makeup, and how your body responds.