The short answer
Reduced trazodone absorption or effectiveness from grapefruit extract is not established. Review the exact extract with the pharmacist because grapefruit can affect drug handling in different ways.
What this answer covers
Oral grapefruit extract; not automatically equivalent to grapefruit juice, seed products or a quantified furanocoumarin preparation.
- Supplement or preparation
- Citrus Paradisi (Grapefruit) Fruit Extract
- Medication ingredient
- trazodone
The medicine’s metabolism matters
Trazodone labeling states that strong CYP3A4 inhibitors can increase exposure. That does not establish reduced absorption from grapefruit extract.
Grapefruit effects depend on the drug
FDA explains that juice can increase some drug levels through enzyme inhibition while reducing certain others through transport effects. The reduced-absorption examples are not trazodone experiments.
An extract is not a standard juice exposure
Provide the product’s plant part, ingredients and amount. Without composition data, the name grapefruit extract does not establish the same activity as studied juice.
Keep dosing decisions with the prescriber
Do not take extra trazodone to offset a presumed loss of effect or invent a protective gap. Follow your formulation’s instructions and discuss new adverse effects.
Evidence and practical considerations
Absorption & effectiveness
Current reduced-effectiveness claim is insufficient; trazodone CYP3A4 susceptibility does not justify reversing exposure direction or assuming extract equivalence.
- Exact scope
- Oral grapefruit extract; not automatically equivalent to grapefruit juice, seed products or a quantified furanocoumarin preparation. with Exact oral trazodone hydrochloride immediate-release tablets. RxNorm IN 10737/PIN 82112 hydrochloride; current immediate-release tablet scope. Oral solutions and modified-release products are not automatically equivalent.
- Medication form and route
- oral
- Timing or duration
- Source-specific single-dose, repeated-dose and observational exposures distinguished.
What remains uncertain
- No exact extract-trazodone human co-use study identified; medicine label describes CYP3A4 inhibitors, not a measured grapefruit extract effect.
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 trazodone.
Exact label names tryptophan and St John’s wort in serotonin warnings; strong CYP3A4 modifiers may change exposure. Drowsiness, orthostatic effects and QT warnings are distinct.
How this applies: RxNorm IN 10737/PIN 82112 hydrochloride; current immediate-release tablet scope. Oral solutions and modified-release products are not automatically equivalent.
No universal supplement interval, event rate or preparation equivalence established. Original label distinguishes warnings from measured pair-specific results.
Source 2: official guidance
fda.gov · Source check Sep 10, 2026
Population: People taking medicines potentially affected by grapefruit juice.
CYP3A4 inhibition increases exposure to some medicines; transporter effects reduce exposure to certain other medicines.
How this applies: Mechanistic context only; drug and product identity determine applicability.
Does not establish reduced trazodone absorption, quantify trazodone co-use or assay grapefruit extract products.
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: 7e768a8c8b063a40
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.