The short answer
Extra low blood pressure from fish oil with fluphenazine has not been established. A small fish-oil trial mentioned fluphenazine use but did not measure the combination’s blood-pressure effects.
What this answer covers
Oral fluphenazine with the exact supplement preparation described.
- Supplement or preparation
- Fish Oil
- Medication ingredient
- fluphenazine
Both exposures appear in an original study
A crossover trial of fish oil and olive oil listed fluphenazine among psychiatric medicines used by two participants. Medication assignments and individual outcomes were not separated, so the reference is evidence of incidental co-exposure rather than a dedicated interaction trial.
The trial measured cholesterol
Twenty-five participants completed the trial. It focused on blood lipids and did not report a blood-pressure interaction outcome. A mention of the drug in the methods cannot support a claim that the combination caused hypotension.
Low blood pressure remains possible from the medicine
The fluphenazine label says hypotension is not usually a problem but can occur. Existing dizziness, other blood-pressure medicines and dehydration matter clinically even though an added fish-oil effect has not been quantified.
Review symptoms and the actual fish-oil dose
Bring the EPA/DHA content and full medication list to the pharmacist if you are considering supplementation or notice dizziness. Do not reduce fluphenazine or apply a made-up spacing rule to compensate for an unmeasured effect.
Evidence and practical considerations
Side effects & toxicity
Extra low blood pressure from fish oil with fluphenazine has not been established. A small fish-oil trial mentioned fluphenazine use but did not measure the combination’s blood-pressure effects.
- Exact scope
- Oral fluphenazine with the exact supplement preparation described. with Oral fluphenazine with the stated label and formulation limits.
- Medication form and route
- oral
What remains uncertain
- Exact medicine incidentally listed in two psychotropic users without individual allocation, doses or outcomes. Lipid study has no BP endpoint. Fluphenazine rare hypotension warning separate, no quantified additive effect.
Factors that may matter: Exact preparation and amount; Other medicines; Seizure history, alertness or electrolyte status where relevant.
Read the supporting source summaries
Source 1: Current U.S. regulatory product labeling
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: Patients prescribed oral fluphenazine.
May cause drowsiness or lethargy. Hypotension is not usually a problem but can occur. Atropine and similar agents may potentiate anticholinergic activity. Caution with seizure history.
How this applies: Exact ingredient and oral-route clinical context.
Label class warnings do not establish every exact botanical interaction, event rate or protective supplement interval.
Source 2: Original human study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Thirty-three recruited adults with moderate hypercholesterolemia; twenty-five completed.
Fluphenazine was listed among psychotropic medicines used by two participants, but individual medication allocation and outcomes were not separated. The trial studied lipids, not blood-pressure interaction outcomes.
How this applies: Shows that a mention of both exposures is not proof that fish oil causes additional low blood pressure.
Incidental co-exposure, small sample and other medicines; no blood-pressure endpoint or exact-pair hypotension estimate.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Initial source-checked draft with exact preparation limits, original study findings and uncertainty. Clinical review not recorded. | |
| Research summary published |
Article revision: 3a18c0ad8d7421a6
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.