What Is Zoloft (Sertraline) Used For?
Zoloft is the brand name for sertraline, the most prescribed antidepressant in the US. It is an SSRI approved for six conditions, from depression to OCD and PTSD. Here is what it treats, how it works and the usual dose, with a guide for each topic.
By withClaro Editorial · 2026-10-23 · 5 min read
Medical review pending. Written by the Claro editorial team from the FDA label and published studies.
More about Zoloft
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What is Zoloft used for? Mainly depression, plus five other conditions such as OCD and PTSD. Zoloft (sertraline) has been on the US market since 1991.
What is Zoloft used for?
The FDA approves Zoloft for six conditions: major depressive disorder, obsessive-compulsive disorder, panic disorder, post-traumatic stress disorder, social anxiety disorder and PMDD. For OCD it is approved from age 6; for the others, in adults. In ClinCalc's estimates for 2024, about 10.2 million people in the US filled a prescription for sertraline, more than for any other antidepressant. Tell your prescriber which symptom bothers you most, because the starting dose differs between conditions.
Is Zoloft an SSRI?
Yes. Zoloft is a selective serotonin reuptake inhibitor, in the same class as Lexapro, Prozac and Celexa. It has only very weak effects on noradrenaline and dopamine. The NHS says SSRIs are usually the first type prescribed because their side effects tend to be easier to manage. For the other types, see the list of antidepressants.
What is the generic name for Zoloft?
The generic name is sertraline, often written on labels as sertraline hydrochloride, the salt form in the tablets. Generic sertraline contains the same active ingredient at the same strength. If your tablets look different between refills, the pharmacy has probably switched makers, so ask the pharmacist to confirm the strength.
Is Zoloft a controlled substance?
No. The FDA label states that sertraline is not a controlled substance. In a study against alprazolam (Xanax) and d-amphetamine, it did not produce the euphoria seen with drugs of abuse. So it doesn't cause a high or cravings. That is different from withdrawal: stopping it suddenly can still bring on symptoms such as dizziness, nausea and irritability, which is why it is lowered gradually.
How does Zoloft work?
Clinical section: medical review pending
Zoloft acts on the serotonin system by blocking the reuptake of serotonin into nerve cells. What follows from that, and why mood takes weeks, is less simple. The clinical view:
Antidepressants change how the brain uses chemical messengers, but how this lifts mood is not fully understood.
The chemical change starts within hours, yet the effect on mood takes weeks. Current thinking points to slower changes in receptors, in brain circuits that handle emotion, and in how the brain forms new connections.
The idea that depression comes from a shortage of serotonin is now considered too simple. That leaves the mechanism unclear, as with many effective medicines. It does not change what trials show about whether antidepressants work.
That slow build is why the first weeks are judged by sleep, energy and anxiety rather than mood alone. Our guide on how long Zoloft takes to work covers the usual timeline.
What doses does Zoloft come in?
Zoloft comes as 25 mg, 50 mg and 100 mg tablets and as an oral solution of 20 mg per mL. The starting dose depends on the condition, and the maximum is 200 mg a day for most of them.
| Condition | Starting dose | Maximum |
|---|
| Depression, OCD (age 13+) | 50 mg | 200 mg |
| OCD, age 6 to 12 | 25 mg | 200 mg |
| Panic disorder, PTSD, social anxiety | 25 mg | 200 mg |
| PMDD, every day | 50 mg | 150 mg |
| PMDD, only in the 2 weeks before a period | 50 mg | 100 mg |
| Mild liver problems | half the usual dose | half the usual maximum |
For depression, OCD, panic disorder, PTSD and social anxiety, increases go in steps of 25 to 50 mg, no more than once a week; PMDD has its own steps. With moderate or severe liver problems, Zoloft is not recommended.
More in Zoloft dosage.
How long does Zoloft stay in your system?
Most of it is gone within about five to six days of the last dose, since its average half-life is about 26 hours; a weaker breakdown product lingers longer, 62 to 104 hours. With daily doses it reaches steady levels after about a week, which is why the label sets dose changes a week apart. For a missed dose, the UK's NHS advises skipping it and taking the next one at the usual time, while the US MedlinePlus says to take it when you remember unless the next dose is nearly due; both say never to double up. Follow the advice for the country where you were prescribed it, and ask your pharmacist if you are unsure.
What side effects does Zoloft cause?
The most common side effects in trials were nausea, diarrhea, tremor, indigestion, decreased appetite, sweating and sexual side effects. Nausea affected 26% of people on Zoloft against 12% on placebo, and diarrhea 20% against 10%. The NHS says most side effects ease after a couple of weeks, though some last longer. Sexual side effects can last as long as you take it; the label says their true rate is probably higher than trials show, so they are worth raising.
When should you call your prescriber on Zoloft?
Like every US antidepressant, Zoloft carries an FDA boxed warning: suicidal thoughts and behaviors rose in children, teenagers and young adults up to about age 24 in trials, especially in the first months and after dose changes. In those weeks, watch for new or worse anxiety, agitation, panic attacks, trouble sleeping, irritability or a sudden change in mood or behavior, and call your prescriber right away if they appear. If you have thoughts of harming yourself, call or text 988 in the US, or find a crisis line.
What should you tell your prescriber before starting Zoloft?
A full picture helps your prescriber pick the starting dose and plan the first follow-up. Zoloft often upsets the stomach or raises anxiety at the start, and some medications and conditions change how it is used. Before you start, tell them about:
- other antidepressants you have taken and how they went
- whether you tend to be sensitive to side effects, especially stomach upset or anxiety at the start
- other medications, especially blood thinners, aspirin and pain relievers like ibuprofen, migraine triptans and St John's wort
- any personal or family history of bipolar disorder, mania or hypomania, which the label asks prescribers to check before starting
- liver problems, or seizures in the past
- pregnancy, plans for pregnancy or breastfeeding; don't stop Zoloft on your own
Download on the App Store Zoloft often changes your stomach, sleep and anxiety before it lifts mood, and a dose increase can reset that. The withClaro app lets you log mood, energy, sleep and side effects each day, linked to your dose, and turns it into a report for your doctor.
Related articles
Taper guides
Sources
- FDA label: Zoloft (sertraline), DailyMed
- ClinCalc DrugStats: The Top 300 Drugs of 2024
- NHS: Antidepressants, overview and types
- MedlinePlus: Sertraline
- NHS: Sertraline
- National Institute of Mental Health: Mental Health Medications
- Royal College of Psychiatrists: Antidepressants
- Cipriani et al., 2018, The Lancet: Comparative efficacy and acceptability of 21 antidepressant drugs
- NHS: Side effects of sertraline
- 988 Suicide and Crisis Lifeline
Claro articles are for self-monitoring and educational purposes only. They are not a medical device, therapist, or diagnostic tool, and do not replace care from your prescribing clinician. If you are in crisis, contact your care team, emergency services, the Samaritans (UK: 116 123), or the Crisis Text Line (US: text HOME to 741741).