Sertraline (Zoloft)

What it treats

Sertraline is approved by the U.S. Food and Drug Administration to treat major depressive disorder, panic disorder, post-traumatic stress disorder, social anxiety disorder, obsessive-compulsive disorder, and premenstrual dysphoric disorder. Prescribers also use it for generalized anxiety disorder, which is an off-label use, meaning a purpose the label doesn't formally list even though evidence and practice support it.

It is one of the most commonly prescribed antidepressants in the United States. Part of the reason is range: a single medication that treats depression and several anxiety conditions is useful, because those conditions often appear together.

How it works

Sertraline is a selective serotonin reuptake inhibitor, usually shortened to SSRI. Nerve cells in the brain pass messages using chemical messengers, and serotonin is one of them. After a cell releases serotonin, it normally reabsorbs much of it, a process called reuptake. Sertraline slows that reabsorption, so more serotonin stays available between cells.

How that eases depression and anxiety isn't fully understood. The popular "chemical imbalance" explanation is an oversimplification, and it's worth being honest about that. What is clear is that the early change in serotonin signaling sets off slower adjustments in the brain over the following weeks. Those slower changes are thought to do the real work, which is part of why the medication takes time rather than working the day you start it.

What to expect

Common side effects, and which ones fade

Most people get some side effects. The common ones include:

• Nausea and looser stools or diarrhea. Sertraline causes loose stools somewhat more often than some other SSRIs.
• Headache and dry mouth.
• Trouble sleeping, or for some people, drowsiness.
• Increased sweating.
• Dizziness and mild tremor.
• Reduced appetite, especially early on.

Many of the stomach-related effects ease within one to two weeks. Taking the dose with food often helps with nausea. Sweating and sexual side effects tend to last as long as the medication is taken rather than fading. If a side effect is severe, or it isn't improving after a few weeks, that's a conversation to have with the prescriber rather than a reason to stop on your own.

Serious side effects and warnings

Serious problems are uncommon, but a few are worth knowing.

Boxed warning. Like all antidepressants, sertraline carries an FDA boxed warning that it can increase suicidal thoughts and behaviors in children, teenagers, and young adults under 25, especially in the first weeks of treatment or after a dose change. This does not mean the medication harms most people. It means the early period deserves close attention, and that any worsening of mood, agitation, or new thoughts of self-harm should prompt contact with the prescriber promptly.

• Serotonin syndrome. A rare reaction caused by too much serotonin activity, most likely when sertraline is combined with other drugs that raise serotonin. Signs include agitation, a fast heartbeat, high body temperature, shivering, muscle twitching, and confusion. It is a medical emergency.
• Increased bleeding risk. Sertraline can make bleeding and bruising more likely, especially alongside NSAIDs such as ibuprofen or naproxen, aspirin, or blood thinners.
• Low sodium. A drop in blood sodium can happen, more often in older adults. Symptoms can include headache, confusion, and weakness.
• Mood switch in bipolar disorder. In people who have bipolar disorder, an antidepressant can sometimes trigger a manic or agitated state, which is one reason an accurate diagnosis matters.

Sexual side effects

Sertraline, like other SSRIs, commonly affects sexual function, and it deserves a direct answer rather than a footnote. It can lower sex drive, delay orgasm or make it hard to reach, and cause arousal or erection difficulties. Estimates vary widely depending on how the question is asked, but by many measures a third or more of people notice some change.

These effects usually last as long as the medication is taken, rather than fading like nausea does. They are worth raising with a prescriber, because there are real options: lowering the dose, switching to a medication less likely to cause this, such as bupropion, or adding another medication to counter it. A small number of people report sexual side effects that continue after stopping the drug. This is uncommon and not well understood, but it is a real phenomenon and worth knowing about before you start.

Weight, appetite, and sleep

Sertraline is fairly weight-neutral in the short term, and some people lose a little appetite early on. With long-term use, modest weight gain is possible for some people, though it tends to be smaller than with a few other antidepressants.

Its effect on sleep goes both ways. It makes some people restless or wakeful and makes others drowsy. Because it more often nudges toward wakefulness, it is usually taken in the morning. If it makes you sleepy instead, a prescriber may suggest taking it at night.

Starting and dosing basics

This section is general background, not a dosing instruction for any individual. The right dose is a decision for a prescriber.

Sertraline comes as tablets and as a liquid concentrate. For depression, a common starting dose is 50 mg a day. For panic disorder, PTSD, social anxiety, and PMDD, prescribers often start lower, around 25 mg, to ease in and limit early jitteriness. The usual effective range is 50 to 200 mg a day, and the dose is raised gradually based on how a person responds and tolerates it. It can be taken with or without food, though food helps with nausea.

Missed doses and interactions

If you miss a dose, the general guidance is to take it when you remember, unless it is almost time for the next dose. In that case, skip the missed dose and carry on. Don't take two doses to make up for one.

Several interactions matter. Sertraline should not be combined with MAOI antidepressants, and a gap is needed when switching between them. Combining it with other drugs that raise serotonin, such as triptans for migraine, tramadol, other antidepressants, or the supplement St. John's wort, increases the risk of serotonin syndrome. It should not be taken with pimozide. NSAIDs and blood thinners add to bleeding risk.

Alcohol is not formally prohibited, but it isn't recommended. It can worsen side effects, disturb sleep, and work against the mood benefit you're taking the medication for. Give every prescriber and pharmacist a full list of your medications and supplements, including over-the-counter ones.

Stopping and tapering

Sertraline is not addictive in the usual sense of that word. It does not cause cravings or compulsive use. But the body does adjust to it, and stopping suddenly can cause discontinuation symptoms: dizziness, flu-like feelings, irritability, vivid dreams, trouble sleeping, and the brief electrical "brain zap" sensations many people describe.

These symptoms are uncomfortable but not dangerous, and they are more likely the higher the dose and the longer the medication has been taken. The way to avoid them is a gradual taper planned with a prescriber, stepping the dose down over weeks. Deciding to stop because you feel better is understandable, and sometimes it is the right call, but it is still worth doing slowly and with guidance.

Pregnancy and breastfeeding

This is an area where individual circumstances matter and the decision belongs with a clinician. Untreated depression and anxiety carry their own risks during pregnancy, and sertraline is one of the more studied SSRIs in this setting. It also passes into breast milk in low amounts. None of that adds up to one answer that fits everyone. Anyone who is pregnant, planning a pregnancy, or breastfeeding should talk it through with their prescriber so the specific risks and benefits can be weighed for their situation.

Cost and generic availability

Sertraline has been available as a generic for many years and is inexpensive. The brand name Zoloft and generic sertraline contain the same active medication and work the same way. Most insurance plans cover it, and for people paying out of pocket, generic sertraline is among the lower-cost antidepressants.

Common questions

How long until sertraline works? Some early effects on sleep and appetite can show within one to two weeks. The fuller effect on mood and anxiety usually takes four to six weeks, sometimes up to eight.

Is sertraline addictive? No, not in the usual sense. It doesn't cause cravings or compulsive use. The body does adapt to it, which is why stopping should be gradual.

Can I drink alcohol while taking it? It isn't banned, but it isn't recommended. Alcohol can worsen side effects and sleep and can undercut the benefit.

Will it change my personality? It shouldn't. When it works well, most people say they feel more like themselves, not numbed or different. If you feel flat or not yourself, tell your prescriber.

Should I take it in the morning or at night? Usually the morning, because it can be mildly activating. If it makes you sleepy, your prescriber may suggest taking it at night.

Questions to ask your prescriber

• What are we hoping this treats, and how will we know it's working?
• Which side effects should I expect early, and which ones should I call about?
• How long should I plan to take it?
• What's the plan if it doesn't help enough?
• If we decide to stop it later, how would we do that safely?

Sources

This guide draws on current prescribing information and public health references. It is reviewed for clinical accuracy and updated as guidance changes.

• U.S. Food and Drug Administration. Sertraline hydrochloride (Zoloft) prescribing information.
• MedlinePlus, U.S. National Library of Medicine. Sertraline.
• National Institute of Mental Health. Mental health medications.
• American Psychiatric Association. Practice guideline for the treatment of patients with major depressive disorder.