Sertraline Drug Interactions: What to Avoid and What to Tell Your Doctor

Sertraline (Zoloft) is generally well-tolerated, but it has several important drug interactions you need to be aware of — including a few that are genuinely dangerous. Before starting sertraline, give your doctor and pharmacist a complete list of everything you take, including prescription medications, over-the-counter drugs, vitamins, and herbal supplements.

ABSOLUTE CONTRAINDICATIONS: Never Combine These With Sertraline

1. MAOIs (Monoamine Oxidase Inhibitors) — Risk of Life-Threatening Serotonin Syndrome

This is the most dangerous sertraline interaction. MAOIs include phenelzine (Nardil), tranylcypromine (Parnate), isocarboxazid (Marplan), and selegiline (Emsam, Zelapar). The antibiotic linezolid (Zyvox) and IV methylene blue also have MAOI activity.

Combining sertraline with an MAOI can cause serotonin syndrome — a potentially life-threatening condition characterized by agitation, hyperthermia (dangerously high fever), muscle rigidity, rapid heart rate, and seizures. In severe cases, it can be fatal.

Rules to follow:

• Wait at least 14 days after stopping an MAOI before starting sertraline
• Wait at least 14 days after stopping sertraline before starting an MAOI
• If you need IV methylene blue or linezolid urgently, sertraline must be discontinued first

2. Pimozide — Risk of Serious Cardiac Arrhythmia

Pimozide (Orap) is contraindicated with sertraline. Sertraline significantly increases pimozide blood levels (approximately 40% increase in AUC and Cmax), which can cause dangerous QT interval prolongation and potentially fatal cardiac arrhythmias. This combination must never be used.

3. Thioridazine — Risk of Fatal QT Prolongation

Thioridazine (Mellaril) is contraindicated with sertraline. Sertraline inhibits CYP2D6 metabolism of thioridazine, raising blood levels. Combined with sertraline's own mild QTc-prolonging effect, this can cause fatal cardiac arrhythmias.

4. Disulfiram (With Sertraline Oral Solution Only)

Sertraline oral solution contains 12% alcohol. Taking it with disulfiram (Antabuse) causes a disulfiram-alcohol reaction — flushing, nausea, vomiting, and cardiovascular symptoms. This contraindication applies only to the liquid formulation, not tablets or capsules.

Serious Interactions: Use With Extreme Caution

Serotonergic Medications — Risk of Serotonin Syndrome

Any medication that increases serotonin activity raises the risk of serotonin syndrome when combined with sertraline. This includes:

• Triptans (sumatriptan, rizatriptan) — used for migraines. Use with caution; monitor carefully.
• Tramadol — opioid pain medication with serotonergic properties. This combination also lowers the seizure threshold.
• Fentanyl and other opioids — especially at higher doses
• Lithium — can enhance serotonergic effects; increases tremor risk (seen in 35% of patients in a controlled study)
• St. John's Wort — herbal supplement with serotonergic activity. Avoid entirely during sertraline treatment.
• Other antidepressants (SNRIs, TCAs) — combining with sertraline requires careful monitoring.

NSAIDs and Blood Thinners — Risk of Abnormal Bleeding

Sertraline reduces platelet serotonin content, which can impair normal clotting. When combined with NSAIDs (ibuprofen, naproxen, aspirin) or anticoagulants (warfarin, apixaban, rivaroxaban), the risk of gastrointestinal bleeding and other abnormal bleeding significantly increases.

If you regularly take NSAIDs or blood thinners, discuss this combination with your prescriber. Avoid taking NSAIDs routinely or at high doses while on sertraline.

CYP2D6 Drug Interactions

Sertraline moderately inhibits CYP2D6, an enzyme that metabolizes many medications. This means sertraline can raise blood levels of:

• Certain antipsychotics (risperidone, haloperidol, thioridazine — last is contraindicated)
• Some opioids (codeine, methadone)
• Bupropion (Wellbutrin) — blood levels may increase
• Some beta blockers and antiarrhythmics

Food and Supplement Interactions

• Alcohol: Alcohol is not technically contraindicated with sertraline, but it can worsen depression and anxiety, increase drowsiness, and reduce sertraline's effectiveness. Limit or avoid alcohol during treatment.
• Grapefruit: Grapefruit and grapefruit juice can affect the metabolism of sertraline via CYP3A4/2C19 pathways, potentially increasing drug levels. Discuss grapefruit consumption with your pharmacist.
• Tryptophan supplements: Tryptophan is a precursor to serotonin. Combining tryptophan supplements with sertraline may increase serotonin syndrome risk.

What to Tell Your Doctor and Pharmacist

Before starting sertraline, make sure your healthcare team knows about:

• All prescription medications, including recent MAOIs or current psychiatric medications
• All OTC pain relievers and anti-inflammatory medications
• Blood thinners or antiplatelet medications
• Herbal supplements, especially St. John's Wort
• Any history of bipolar disorder or mania

See also: Sertraline Side Effects: What to Expect and When to Call Your Doctor.

Also: What Is Sertraline? Uses, Dosage, and What You Need to Know in 2026.