The short answer
Review concentrated garlic supplements with your prescriber because fluoxetine already carries a bleeding warning. This is a precaution, not a measured risk for every garlic product or normal food use.
What this answer covers
Oral Allium sativum supplements; raw food garlic, commercial tablets and extracts differ.
- Supplement or preparation
- Allium sativum
- Medication ingredient
- fluoxetine
Why the combination deserves review
Fluoxetine affects serotonin-related platelet function and warns about bleeding. NCCIH advises disclosing garlic supplements, particularly before procedures or with medicines that affect bleeding.
Food-level findings were reassuring within limits
A small study of raw garlic in food found no impairment in measured platelet function. It did not include fluoxetine or establish the safety of every extract.
Supplement findings were mixed
A commercial-tablet study found no significant platelet aggregation change, yet participants reported some bleeding symptoms. Reporting inconsistencies prevent using it as a reliable risk percentage.
Report bleeding and plan procedures individually
Tell the prescriber about unusual bruising, prolonged nosebleeds or heavier bleeding. Seek urgent care for major bleeding or black stools. Give the procedure team your full supplement list; do not stop fluoxetine on your own.
Evidence and practical considerations
Side effects & toxicity
Conditional bleeding review supported by medicine/supplement warnings and mixed human findings, without exact-pair incidence.
- Exact scope
- Oral Allium sativum supplements; raw food garlic, commercial tablets and extracts differ. with Exact oral fluoxetine hydrochloride capsules. RxNorm IN 4493/PIN 227224 hydrochloride capsules. Active norfluoxetine and prolonged elimination matter. Not the combined olanzapine product.
- Medication form and route
- oral
- Timing or duration
- Source-specific single-dose, repeated-dose and observational exposures distinguished.
What remains uncertain
- No original fluoxetine-garlic co-use bleeding study identified; platelet assays and reported bleeding need not agree.
Factors that may matter: preparation and plant part; clinical indication; dose; other medicines; baseline alertness.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed oral fluoxetine.
Exact label names tryptophan and St John’s wort in serotonin warnings, warns about bleeding and mania, and describes long elimination of fluoxetine and norfluoxetine.
How this applies: RxNorm IN 4493/PIN 227224 hydrochloride capsules. Active norfluoxetine and prolonged elimination matter. Not the combined olanzapine product.
No universal supplement interval, event rate or preparation equivalence established. Original label distinguishes warnings from measured pair-specific results.
Source 2: official botanical guidance
nccih.nih.gov · Source check Sep 10, 2026
Population: People considering garlic supplements.
Garlic supplements may increase bleeding risk; disclose use before procedures and with medicines affecting bleeding.
How this applies: Relevant bleeding precaution for supplement review, not a measured exact-pair interaction.
No fluoxetine-specific event rate or universal food restriction.
Source 3: original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Eighteen healthy volunteers in a blinded crossover; five also took repeated doses for one week.
No impairment in tested platelet-function measures after single or repeated exposure.
How this applies: Only the named drug, preparation, route and measured endpoints apply.
No fluoxetine and no clinical bleeding endpoint; food preparation is not every concentrated extract.
Source 4: original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Sixty-two healthy volunteers.
No significant platelet aggregation change with garlic; some menstrual bleeding and nosebleeds were reported.
How this applies: Only the named drug, preparation, route and measured endpoints apply.
Open-label study; bleeding counts and denominators are inconsistently described. No fluoxetine co-use or reliable exact-pair bleeding frequency.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Current exact available claims adjudicated using original captures and explicit identity and comparator limits. | |
| Research summary published |
Article revision: 744d25bd325af294
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
Taking other supplements or medications?
Use the checker to explore your other combinations. Ask a pharmacist to review the exact products, amounts and medical conditions in your complete list.
Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.