Yes, diarrhea is a recognized side effect of Lexapro (escitalopram). In FDA clinical trials, about 8% of people taking Lexapro reported diarrhea, compared to 5–6% of those taking a placebo. It’s one of the more common gastrointestinal side effects, though far from the most frequent (nausea tops that list at 15%).
How Common It Is by Dose
The likelihood of experiencing diarrhea on Lexapro depends significantly on your dose. In a fixed-dose trial for depression, only 6% of people taking 10 mg per day reported diarrhea, which was barely higher than the 5% in the placebo group. But at 20 mg per day, that number jumped to 14%, more than double the rate at the lower dose.
This means if you recently increased from 10 mg to 20 mg and noticed looser stools, the dose change is a likely explanation. It also means that for most people on the standard 10 mg dose, diarrhea is not especially common.
Why SSRIs Affect Your Gut
Lexapro works by increasing serotonin levels in the brain, but most of your body’s serotonin (roughly 90–95%) is actually produced in the gut. When an SSRI raises serotonin activity throughout your body, it speeds up the movement of food through your intestines. This is the same basic mechanism behind nausea, another frequent SSRI side effect. Your digestive system is essentially responding to a chemical signal that tells it to move things along faster than usual.
How Long It Typically Lasts
Most gastrointestinal side effects from SSRIs, including diarrhea, are strongest during the first one to two weeks and tend to fade as your body adjusts. The FDA prescribing information for Lexapro doesn’t specify an exact timeline for diarrhea resolution, but the general pattern with this class of medication is that digestive side effects are front-loaded. If diarrhea persists beyond the first few weeks or gets worse over time rather than better, that’s worth bringing up with whoever prescribed the medication.
Lexapro vs. Other SSRIs
If you’re wondering whether switching medications might help, Lexapro actually causes less diarrhea than some alternatives. Zoloft (sertraline), one of the most commonly prescribed SSRIs, causes diarrhea in about 20% of users, compared to Lexapro’s 8%. Lexapro is generally considered one of the better-tolerated SSRIs for gastrointestinal side effects overall.
Practical Ways to Manage It
Taking Lexapro with food can help buffer its effect on your stomach and intestines. While the medication can be taken with or without food, pairing it with a meal may reduce the intensity of digestive symptoms, especially during the first couple of weeks. Staying hydrated matters too, since diarrhea increases fluid loss.
A few other things that can help during the adjustment period:
- Avoid trigger foods like caffeine, spicy dishes, and high-fat meals, which can compound the problem.
- Eat smaller, more frequent meals rather than large ones to reduce the load on your digestive system at any given time.
- Consider the timing of your dose. Some people find that taking Lexapro in the evening means any digestive effects happen overnight rather than during the day.
When Diarrhea Signals Something More Serious
In rare cases, diarrhea combined with other symptoms can be a sign of serotonin syndrome, a potentially dangerous condition caused by too much serotonin activity. This is most likely when you’ve just started Lexapro, increased your dose, or are combining it with another medication that affects serotonin. Symptoms typically appear within hours of the change.
Serotonin syndrome involves a cluster of symptoms beyond just diarrhea: agitation, confusion, rapid heart rate, muscle twitching, heavy sweating, shivering, and dilated pupils. Severe cases can include high fever, seizures, and irregular heartbeat. Diarrhea on its own is almost certainly a standard side effect. Diarrhea alongside several of those other symptoms, especially appearing suddenly after a dose change, requires immediate medical attention.