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Paroxetine

Prescription ·Strong evidence ·Reviewed May 2026

Prescription selective serotonin reuptake inhibitor (SSRI) approved for major depressive disorder, GAD, panic disorder, social anxiety disorder, OCD, and PTSD. Notable for its potent serotonin reuptake inhibition and anticholinergic activity. Associated with a higher risk of discontinuation syndrome upon abrupt cessation compared to other SSRIs due to its shorter half-life and lack of active metabolites. Dosage must be determined by your prescribing physician.

Evidence tier
Strong
Indexed sources
10 2007–2022
Interactions
8
Depletes
2 nutrients
Read the sources → Compare profiles
What it's good for
  • Depression symptom relief1,2
  • Anxiety reduction across multiple anxiety disorders
  • Panic attack prevention9
  • Social anxiety improvement
  • PTSD symptom relief5,6
What to watch for
  • Sexual dysfunction
  • Weight gain
  • Drowsiness
  • Concurrent MAOI use (within 14 days)
  • Concurrent pimozide or thioridazine use

The bottom line

Evidence rating strong. Most-documented uses: depression symptom relief, anxiety reduction across multiple anxiety disorders, panic attack prevention. 10 sources indexed (2007–2022), with 8 interaction records on file.

The science

How it works, mechanistically.

Core mechanism

Potently and selectively inhibits serotonin (5-HT) reuptake by blocking SERT. Also has mild norepinephrine reuptake inhibition and notable anticholinergic (muscarinic receptor antagonism) properties, contributing to its side effect profile. Also a potent inhibitor of CYP2D6, leading to clinically significant drug interactions with CYP2D6 substrates (e.g., codeine, tamoxifen, TCAs).10

Class
SSRI
Dosing

Dosing & protocol.

Common range
10–60 mg daily (as prescribed by your physician)
Recommended form
Tablet or controlled-release tablet

Can be taken with or without food. Take at the same time each day, typically in the morning. Do not crush or chew controlled-release tablets.9

Depletions

What it depletes.

Nutrients this medication can lower over time, and what to replace.

Sodium

Significant

SSRI-induced SIADH can lower serum sodium, especially in older adults and during the first weeks of therapy.

Monitor Serum sodiumOnset Most often within the first 2-12 weeks

Folate

Mild

Lower folate status is associated with poorer SSRI response and may be reduced in some chronic users through altered one-carbon metabolism.

Replace MethylfolateMonitor Serum folate or RBC folateOnset Usually over months
Genetics

Who responds differently.

CYP2D6*4 / *5 / *10 / gene duplications~15% of population

Paroxetine exposure rises in CYP2D6 poor metabolizers, increasing the risk of side effects and complicating interactions with other CYP2D6 substrates.

Recommendation: If paroxetine causes disproportionate adverse effects, discuss dose reduction or a non-CYP2D6-heavy alternative with the prescriber.

Safety

Full safety detail.

Side effects

  • Sexual dysfunction
  • Weight gain
  • Drowsiness
  • Dry mouth
  • Nausea
  • Constipation
  • Dizziness
  • Discontinuation syndrome upon abrupt cessation

Contraindications

  • Concurrent MAOI use (within 14 days)
  • Concurrent pimozide or thioridazine use
  • Known hypersensitivity to paroxetine1,2
  • Pregnancy (Category D for Paxil)
Interactions

Interaction records.

DangerousContraindicated

5-HTP

5-HTP combined with paroxetine creates dangerous serotonin syndrome risk. Paroxetine is the most potent SERT inhibitor among SSRIs.

Recommendation: Do NOT take 5-HTP with paroxetine.

DangerousContraindicated

St. John's Wort

Dual serotonin reuptake inhibition from paroxetine and St. John's Wort creates high serotonin syndrome risk.

Recommendation: Do NOT combine. Allow at least 2 weeks washout after stopping paroxetine before starting SJW.

ModerateCaution

Rhodiola Rosea

Paroxetine is serotonergic. Rhodiola has preclinical monoamine and MAO-related findings, but direct human evidence for serotonin syndrome with Paroxetine is limited. Combined use should be treated as a theoretical serotonergic-interaction risk, not as a proven prescription-MAOI-like contraindication.

Recommendation: Do not use Rhodiola to self-augment Paroxetine. Discuss Rhodiola with the prescriber or pharmacist first, especially if other serotonergic agents are present, and seek care for serotonin-toxicity symptoms if both are used.

DangerousContraindicated

MDMA

Paroxetine blocks the serotonin transporter MDMA uses to release serotonin, and paroxetine is also a potent CYP2D6 inhibitor — the enzyme that clears MDMA. The combination both blunts MDMA's effect and raises MDMA blood levels, increasing the risk of serotonin syndrome, hyperthermia, and death.

Recommendation: Do not combine MDMA with paroxetine. If paroxetine is stopped, wait at least 1-2 weeks before any MDMA use.

ModerateCaution

Fish Oil

Paroxetine depletes platelet serotonin stores and impairs aggregation; high-dose fish oil adds antiplatelet activity. Together they raise bleeding risk, especially with concurrent NSAIDs, aspirin, or anticoagulants.

Recommendation: Keep fish oil to ≤1g/day with paroxetine. Avoid high-dose fish oil unless your prescriber agrees, and watch for bruising, nosebleeds, or dark stools. Stop fish oil 7 days before surgery.

ModerateCaution

Ginkgo Biloba

Paroxetine depletes platelet serotonin and impairs aggregation; Ginkgo's ginkgolides inhibit platelet-activating factor. The combination compounds bleeding risk, particularly with concurrent NSAIDs or anticoagulants.

Recommendation: Avoid Ginkgo biloba while taking paroxetine. Watch for bruising, nosebleeds, or GI bleeding; stop Ginkgo 7-14 days before any planned surgery.

DangerousContraindicated

L-Tryptophan

L-Tryptophan is the upstream precursor to serotonin. Combined with paroxetine's potent serotonin reuptake blockade, supplemental L-tryptophan can push synaptic serotonin to toxic levels and trigger serotonin syndrome (agitation, tremor, sweating, hyperthermia, clonus).

Recommendation: Do not take L-tryptophan supplements with paroxetine. Dietary protein-bound tryptophan is fine; concentrated supplemental doses are the issue.

SeriousCaution

SAMe

SAMe has independent serotonergic and antidepressant activity. Combined with paroxetine, the additive serotonergic effect raises the risk of serotonin syndrome — agitation, sweating, tremor, hyperreflexia, clonus, and hyperthermia.

Recommendation: Avoid starting SAMe alongside paroxetine without explicit prescriber approval. If used together, start SAMe at the lowest effective dose and watch for tremor, restlessness, sweating, or rapid heart rate.

Search all 8 interaction records for Paroxetine →

Sources

Sources, by evidence tier.

Numbered references. Citations throughout the page link here.

Meta-analyses & systematic reviews

4

Reviews & position papers

3

Reference material

3
Keep exploring

Deep dives & adjacent profiles.

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This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.

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NutriStack is an informational and organizational tool, not a medical service, and not a substitute for professional advice. Always consult a qualified healthcare professional before starting, stopping, or changing any supplement or medication.