Elderberry and medications.
Elderberry is in the Distil supplement database, evidence Grade B. The page below lists every medication we have explicitly assessed it against.
Elderberry is an extract of Sambucus nigra berries, taken to shorten and soften colds and flu rather than prevent them outright. The evidence is Grade B for respiratory use, with trials showing reduced symptom duration when started early, and we do not recommend it for general immune resilience. The prevention question has actually been tested in well people and the answer was no: a trial in 312 air travellers found 17 colds on placebo against 12 on elderberry, a difference that could easily be chance, and the systematic review that graded the evidence concluded it may not reduce the risk of catching a cold at all. What it may do is shorten and soften the cold once you have one. The honest framing is that this is a short-term, situational tool: best at the first sign of illness or across a single travel or winter window, not something to take all year. Typical dosing is 600 to 900mg of standardised extract acutely, dropping to around 300mg for seasonal maintenance. The interaction point that matters most is immune-related. In laboratory studies elderberry raises the production of inflammatory immune signals (cytokines), so it is excluded where the immune system is deliberately suppressed or dysregulated: on immunosuppressants, in autoimmune conditions, and in HIV or AIDS under specialist-managed care. The concern here is mechanistic rather than reported cases, but with the immune system already being managed it is not worth the uncertainty. One safety note worth repeating: raw elderberries are toxic, so only prepared supplement forms are safe. Practically, keep it as an occasional acute remedy and stop once you are well.
Below are the 10 documented pairs we have explicitly assessed for Elderberry: 4 amber and 6 green. The pairs cluster around 1 mechanism: Immune-stimulant vs immunosuppressant (precautionary). Every call is cited to either a clinical reference (PMID) or the British National Formulary. Anything not listed here is either still to be assessed or beyond our database scope. The checker beneath surfaces assessments by medication, and the missing-item form at the bottom of the page routes any uncatalogued medication into our next curation pass.
Documented interactions
Last reviewed 28 August 2026. Each interaction below lists the evidence its assessment drew on: some rest on studies of the exact pair, others on mechanism evidence, where a citation may support one part of the reasoning rather than the exact combination. The evidence line on each entry says which.
Immune-stimulant vs immunosuppressant (precautionary)
Amber Does Elderberry interact with Ciclosporin?
Ciclosporin works by calming the immune system down, which is what stops your body rejecting a transplant or quietens an autoimmune condition. Elderberry is taken to support the immune system and has been shown to stimulate it. There is no proof the two clash in people, but because the stakes with a transplant or autoimmune disease are high, it is safer not to start elderberry while you take ciclosporin without first talking to your transplant or specialist team.
Evidence: No direct study of this exact combination yet; the caution rests on a plausible mechanism or on reports involving a related medicine.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does Elderberry interact with Everolimus?
Everolimus works by calming the immune system down, either to stop your body rejecting a transplant or as part of cancer treatment, and elderberry is taken to stimulate the immune system, so the concern is that elderberry may work against everolimus and make it less effective. We have not identified evidence that elderberry changes everolimus blood levels, so a routine level test could look entirely normal even while the effect is being opposed. Studies of elderberry with everolimus have not been done, so this is a precaution drawn from how each one behaves rather than a measured effect, and it is worth clearing with the specialist who manages your everolimus before you start elderberry.
Evidence: No direct study of this exact combination yet; the caution rests on a plausible mechanism or on reports involving a related medicine.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does Elderberry interact with Sirolimus?
Sirolimus works by calming the immune system down so your body does not reject a transplant, and elderberry is taken to stimulate the immune system, so the concern is that elderberry may work against sirolimus and make it less effective. We have not identified evidence that elderberry changes sirolimus blood levels, so a routine trough test could look entirely normal even while the protection is being opposed, which is the part worth understanding here. Studies of elderberry with sirolimus have not been done, so this is a precaution drawn from how each one behaves rather than a measured effect, and it is worth clearing with your transplant team before you start elderberry.
Evidence: No direct study of this exact combination yet; the caution rests on a plausible mechanism or on reports involving a related medicine.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does Elderberry interact with Tacrolimus?
Tacrolimus works by calming the immune system down, which is what stops your body rejecting a transplant or quietens an autoimmune condition. Elderberry is taken to support the immune system and has been shown to stimulate it. There is no proof the two clash in people, but because the stakes with a transplant or autoimmune disease are high, it is safer not to start elderberry while you take tacrolimus without first talking to your transplant or specialist team.
Evidence: No direct study of this exact combination yet; the caution rests on a plausible mechanism or on reports involving a related medicine.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Other
Green Does Elderberry interact with Efavirenz?
Elderberry is often described as risky for people living with HIV because it stimulates the immune system, and our curated interaction database records no interaction between elderberry and efavirenz: efavirenz works by blocking an enzyme the virus needs rather than by damping your immune system, so there is nothing here for elderberry to push against. Efavirenz is broken down mainly by a different liver enzyme from the other HIV medicines, and we have not identified a study of elderberry against that particular enzyme, so this one rests on there being no signal anywhere rather than on a direct test. We treat this pair as safe to combine, and because efavirenz has a fairly narrow band where it works well without causing vivid dreams or low mood, it is worth telling your HIV team about any supplement you start.
Evidence: No direct study of this exact combination yet; the assessment rests on what is known about each of the two.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
What this list does not say. Pairs not flagged here are not implicitly safe. They are either not yet in our database, or fall outside our inclusion scope. Use the checker below to surface any medication, and submit a missing item if you take something we have not catalogued.
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