Zoloft is the brand name for sertraline, an SSRI used to treat anxiety, panic disorder, PTSD, OCD, social anxiety disorder, and depression. It's one of the most widely prescribed antidepressants in the United States. The therapeutic effect on anxiety develops over four to six weeks at a typical dose of 50 to 200 mg per day. Sertraline has the broadest FDA-approved indication set in the SSRI class for anxiety-spectrum conditions.
What Zoloft is
Zoloft is the brand name for sertraline, a medication in the SSRI class. It was approved by the FDA in 1991 for major depressive disorder and has since been approved for panic disorder, post-traumatic stress disorder, obsessive-compulsive disorder, social anxiety disorder, and premenstrual dysphoric disorder. The broad indication set is one of the reasons it sits at or near the top of most psychiatrists' SSRI shortlist for anxiety-spectrum patients.
Generic sertraline is widely available and clinically equivalent. The MedlinePlus drug information page for sertraline covers the patient-facing essentials.
What it does
Sertraline blocks the serotonin transporter, increasing serotonin availability in the synapse. Over weeks, the brain's threat-detection circuitry adapts. Reactivity to triggers comes down. Sleep often consolidates. The intensity of intrusive thoughts and physical anxiety symptoms decreases. The mechanism is the same SSRI mechanism described in the SSRI and CBT reference; what distinguishes sertraline is its dose flexibility and breadth of evidence. You can watch what an SSRI does at the synapse in PsychiatryRx's interactive guide.
What it feels like
Patients on a working dose of Zoloft usually describe a wider gap between a stressor and the felt reaction. Panic attacks become less frequent, less intense, or both. Worry becomes easier to set down. Rumination and reassurance-seeking soften over weeks.
Early side effects in the first one to two weeks include nausea and loose stools (more common than with Lexapro), headache, sleep disruption, and a transient increase in anxiety. GI symptoms usually settle within two weeks and are reduced by taking the medication with food. Sexual side effects are common and may persist.
When it's chosen
Sertraline is often the first SSRI tried for panic disorder, PTSD, and OCD because of its stronger evidence base in those conditions. It's also a reasonable first choice for generalized anxiety disorder and social anxiety disorder.
Sertraline has slightly more drug-interaction potential than escitalopram (some CYP2D6 inhibition), but the interactions are usually manageable. It's among the SSRIs with the most extensive safety data in pregnancy and lactation and is often the first choice when an SSRI is started during pregnancy.
Typical dosing and timeline
Starting dose for anxiety is typically 25 mg daily for one week, then 50 mg. The typical effective dose for anxiety is 50 to 100 mg; OCD often requires 100 to 200 mg. The FDA-approved maximum is 200 mg daily.
Take with food, ideally at the same time each day. Linear pharmacokinetics make dose adjustments straightforward. The therapeutic effect on anxiety develops over four to six weeks at a stable dose.
Side effects and cautions
GI side effects in the first two weeks (loose stools, indigestion, nausea) are the most common early complaint. Sleep changes can go in either direction, with some patients more alert and others more sedated. Sexual side effects are frequent and may persist. Modest weight gain over months is possible.
The FDA boxed warning on increased suicidal thoughts in patients under 25 in the first months of treatment applies. The NIMH mental health medications page discusses this. Close monitoring early in treatment is the appropriate response, not avoidance.
Discontinuation symptoms can occur if sertraline is stopped abruptly. A gradual taper over several weeks under clinician guidance avoids most of them.
What Zoloft doesn't do
Zoloft doesn't produce an immediate calming effect. Single doses don't produce a felt change. The therapeutic action is the result of weeks of receptor adaptation. Patients who expect to feel calmer the first week are typically disappointed and sometimes stop prematurely.
Zoloft isn't a controlled substance and doesn't produce addiction. It does produce physical adaptation, which is why it requires a taper to stop.
Zoloft doesn't address the cognitive patterns of anxiety in the way exposure therapy and CBT do. Combined treatment is the typical recommendation for panic disorder, social anxiety, and OCD.
Comparison with related medications
Compared with Lexapro, Zoloft has stronger evidence in panic disorder, PTSD, and OCD; Lexapro is often slightly better tolerated in the first weeks. See the Lexapro vs Zoloft comparison. Compared with Prozac (fluoxetine), sertraline has a shorter half-life, which makes day-to-day dosing more straightforward but discontinuation slightly more sensitive to missed doses. Compared with venlafaxine (an SNRI), sertraline has a milder discontinuation syndrome and no blood pressure effect.