The short answer
Avoid eating grapefruit flesh while taking oral cyclosporine. The prescribing information specifically includes grapefruit as well as its juice. The main clinical studies tested juice, so they do not tell us the exact effect of one serving of fruit or establish a safe portion.
What this answer covers
Edible grapefruit flesh from Citrus paradisi with oral systemic cyclosporine. Whole-fruit avoidance comes from the exact medicine’s label; juice trial results provide supporting context and are not described as flesh experiments.
- Supplement or preparation
- Grapefruit flesh
- Medication ingredient
- cyclosporine
Does the warning include the fruit itself?
Yes. Cyclosporine prescribing information tells patients to avoid grapefruit and grapefruit juice. That is the direct basis for avoiding the flesh. It is broader than a warning about drinking the medicine with juice and does not provide an exempt serving size for eating grapefruit at another meal.
What do the clinical studies add?
A small study with grapefruit juice found increased absorption of microemulsion cyclosporine in healthy volunteers. Another study in children found different results between conventional solution and microemulsion. These experiments support concern about grapefruit exposure, but neither measured the effect of eating a portion of grapefruit flesh.
What safety problem is being prevented?
Cyclosporine needs careful control of exposure. Excess exposure can contribute to toxicity, including kidney problems, while insufficient treatment can fail to protect a transplant. The fruit warning is a precaution against altered drug exposure; the juice studies do not establish how often eating grapefruit flesh causes a clinical injury.
Can changing the time of the meal solve it?
No protective interval for grapefruit flesh was established by the sources checked. Follow the avoidance instruction and ask your clinical team about accidental intake rather than skipping or reducing cyclosporine. Report what you ate and when, so the team can decide whether an additional drug-level or kidney-function check is appropriate.
Evidence and practical considerations
Side effects & toxicity
Avoid eating grapefruit flesh while taking oral cyclosporine. The prescribing information specifically includes grapefruit as well as its juice. The main clinical studies tested juice, so they do not tell us the exact effect of one serving of fruit or establish a safe portion.
- Exact scope
- Edible grapefruit flesh from Citrus paradisi with oral systemic cyclosporine. Whole-fruit avoidance comes from the exact medicine’s label; juice trial results provide supporting context and are not described as flesh experiments. with Cyclosporine, RxCUI 3008, IN, systemic oral use. Neoral modified microemulsion and conventional Sandimmune are distinguished; neither is automatically dose-equivalent to the other. The Neoral label identifies cyclosporine as the active ingredient and basis of strength. Intravenous reference experiments are identified separately; ophthalmic and topical use are excluded.
- Medication form and route
- oral
- Timing or duration
- Only the durations described in the sources are established; no untested persistence or dose-spacing interval is inferred.
What remains uncertain
- Whole-fruit avoidance is directly labeled but the inspected primary experiments concern juice. Clinical injury and safe flesh portions were not established.
Factors that may matter: amount of grapefruit flesh; cyclosporine formulation; kidney function; other interacting products.
Read the supporting source summaries
Source 1: regulatory prescribing information
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: Patients prescribed systemic oral cyclosporine, including transplant recipients.
Requires clinical and blood-level monitoring, recognizes nephrotoxicity and hyperkalemia, cautions with potassium-containing drugs and explicitly advises avoiding grapefruit and grapefruit juice. Neoral and Sandimmune are not bioequivalent.
How this applies: Direct exact-medication identity and oral monitoring guidance. Pair-specific applicability is restricted to the named food or potassium-containing products; other supplements require their own evidence.
A regulatory label does not quantify each supplement interaction. Botanical effects and absolute event rates cannot be inferred from cyclosporine toxicity alone. Formulation-specific findings must be retained.
Source 2: primary human crossover pharmacokinetic study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Twelve healthy volunteers.
Grapefruit juice significantly increased peak concentration and AUC; absolute oral bioavailability increased 45% compared with water.
How this applies: Juice-only contextual evidence. This does not directly measure grapefruit flesh. Flesh avoidance comes from the exact medication label.
Abstract only; exact juice volume and oral dose are not supplied. Healthy volunteers and short sampling do not quantify chronic toxicity. Juice exposure cannot be relabeled as a whole-fruit trial.
Source 3: primary pediatric crossover pharmacokinetic study
pubmed.ncbi.nlm.nih.gov · Source check Sep 10, 2026
Population: Six stable pediatric renal transplant recipients in an open-label, four-period crossover study.
Juice increased the 12-hour trough and reduced elimination rate with conventional solution. No pharmacokinetic difference was detected with microemulsion in this small group.
How this applies: Juice-only contextual evidence. This does not directly measure grapefruit flesh. Flesh avoidance comes from the exact medication label.
Abstract only, six patients, unresolved juice volume and no whole-fruit exposure. A microemulsion null result differs from the healthy-volunteer positive result and is not proof that grapefruit is safe with that formulation.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Original studies and regulatory sources checked; a new article prepared with exact formulation and access limits. No independent clinical review is recorded. | |
| Research summary published |
Article revision: 71074d3e45df66f8
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.