Berberine and medications.
Berberine is in the Distil supplement database, evidence Grade A. The page below lists every medication we have explicitly assessed it against.
Berberine is a plant alkaloid with Grade A evidence for blood glucose control and insulin sensitivity, and Grade B for cardiovascular markers, where it tends to lower LDL cholesterol by around 20 to 25%. It works partly by activating AMPK, an energy-sensing pathway that overlaps with longevity research, and by supporting the gut microbiome. Plain berberine HCl is poorly absorbed at about 5%, so phytosome or dihydroberberine forms are worth preferring; the usual standard dose is 500mg two to three times daily with meals. The interactions are the headline here. Combined with metformin it can stack hypoglycaemia risk, so GP review is essential before pairing them. It inhibits the CYP3A4 enzyme, which means it can raise levels of many medications cleared by that pathway, and it warrants monitoring with warfarin. Two combinations go beyond caution to a firm exclusion: transplant immunosuppressants such as tacrolimus, ciclosporin, sirolimus and everolimus, and antiretroviral therapy for HIV, are all cleared by CYP3A4, so berberine should not be taken alongside them, where a rise in drug levels risks transplant rejection or altered HIV control. Separate it by two hours from antibiotics. GI upset on starting is common and usually settles in a few weeks. A typical pattern is eight weeks on, four weeks off.
Below are the 17 documented pairs we have explicitly assessed for Berberine: 4 red and 13 amber. The pairs cluster around 5 mechanisms: CYP3A4 inhibition, Additive blood-pressure lowering, Additive lipid lowering, Additive glucose lowering, and P-glycoprotein inhibition (raises drug levels). 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 14 June 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.
CYP3A4 inhibition
Red Does interact with Ciclosporin?
Berberine raises ciclosporin blood levels by slowing how the body clears it. A trial in transplant patients showed roughly a 30 percent rise in ciclosporin levels, which can push the drug into the toxic range. We treat this as a do-not-combine pair outside direct transplant-team supervision.
Evidence: Supported by human study data.
Red Does interact with Everolimus?
Berberine can slow how the body clears everolimus, which may push everolimus blood levels higher than intended. We treat this as a do-not-combine pair outside direct transplant-team or oncology supervision.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Red Does interact with Sirolimus?
Berberine can slow how the body clears sirolimus, which may push sirolimus blood levels higher than intended. We treat this as a do-not-combine pair outside direct transplant-team supervision.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Red Does interact with Tacrolimus?
Berberine can slow how the body clears tacrolimus, which may push tacrolimus blood levels higher than intended. We treat this as a do-not-combine pair outside direct transplant-team supervision.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive blood-pressure lowering
Amber Does interact with Amlodipine?
Berberine can lower blood pressure modestly. Added to amlodipine the effect may stack, which is sometimes helpful but can occasionally cause dizziness or a blood pressure that runs lower than your GP intended. Check your blood pressure when you start berberine and tell your GP.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does interact with Losartan?
Berberine can lower blood pressure modestly. Added to losartan the effect may stack. This is usually helpful but can occasionally cause dizziness or a blood pressure that runs lower than intended. Check your blood pressure when you start berberine and tell your GP.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does interact with Ramipril?
Berberine can lower blood pressure modestly. Added to ramipril the effect may stack. This is usually helpful but can occasionally cause dizziness or a blood pressure that runs lower than intended. Check your blood pressure when you start berberine and tell your GP.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive lipid lowering
Amber Does interact with Atorvastatin?
Berberine lowers LDL cholesterol and triglycerides on its own. Combined with atorvastatin the effect is additive, which is sometimes useful and sometimes pushes lipids lower than your GP intended. If you take both, ask for a lipid panel sooner than usual after starting.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Simvastatin?
Berberine lowers LDL cholesterol on its own. Combined with simvastatin the effect is additive. If you take both, ask for a lipid panel sooner than usual after starting so your GP can confirm you are not pushing lipids lower than intended.
Evidence: Limited human data, based on case reports and a known mechanism.
Additive glucose lowering
Amber Does interact with Dapagliflozin?
Berberine lowers blood sugar, and dapagliflozin does too. It is worth monitoring your glucose when you start berberine and letting your GP know; the combination is usually well tolerated because dapagliflozin rarely causes low blood sugar on its own.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does interact with Gliclazide?
Berberine lowers blood sugar on its own, and gliclazide can already cause low blood sugar, so together they can push your glucose too low. If you take both, monitor your glucose closely when starting berberine, and your GP may need to reduce your gliclazide dose. Do not change your gliclazide dose yourself.
Evidence: Supported by human study data.
Amber Does interact with Glimepiride?
Berberine lowers blood sugar on its own, and glimepiride can already cause low blood sugar, so together they can push your glucose too low. If you take both, monitor your glucose closely when starting berberine, and your GP may need to reduce your glimepiride dose. Do not change your glimepiride dose yourself.
Evidence: Supported by human study data.
Amber Does interact with Insulin glargine?
Berberine lowers blood sugar on its own, and insulin can already cause low blood sugar, so together they can push your glucose too low. If you take both, monitor your glucose closely when starting berberine and tell your diabetes team, who may need to reduce your insulin dose. Do not change your insulin dose without your diabetes team's advice.
Evidence: Supported by human study data.
Amber Does interact with Metformin?
Berberine and metformin both lower blood sugar through similar pathways. The combination can work but needs careful glucose monitoring, especially in the first few weeks, to avoid hypoglycaemia.
Evidence: Supported by human study data.
Amber Does interact with Pioglitazone hydrochloride?
Berberine lowers blood sugar, and pioglitazone improves how your body uses insulin. Taken together the glucose-lowering effect adds up, though pioglitazone rarely causes low blood sugar by itself. Monitor your glucose when you start berberine and tell your GP.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does interact with Sitagliptin?
Berberine lowers blood sugar, and sitagliptin does too. It is worth monitoring your glucose when you start berberine and letting your GP know; the combination is usually well tolerated because sitagliptin rarely causes low blood sugar on its own.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
P-glycoprotein inhibition (raises drug levels)
Amber Does interact with Digoxin?
Berberine may raise digoxin blood levels by slowing how the gut pumps it back out. Digoxin has a narrow safe range, so if you take both, watch for nausea, visual changes or an irregular pulse and ask your GP whether a digoxin level check is worthwhile.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
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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How we grade severity, choose what's in scope, and what we exclude.
Every call on this page is reasoned. We publish the full rubric for severity tiers, the medication inclusion logic, the evidence grades we accept, and what we deliberately leave out. About three thousand words. Worth reading once if you use this tool more than occasionally.
Read the full methodologyA full supplement review, built around you, not a generic stack.
The free checker answers one interaction question at a time. A Distil report reviews the bigger picture: your goals, diet, medications, current supplements and any blood results you provide, then shows what appears worth keeping, changing, adding or leaving out.
- what your diet already covers, so you are not adding a capsule for something food is already handling
- which evidence-graded compounds are worth considering for your goals, and which were considered but left out
- what to keep, change or stop from what you already take, plus the order to introduce anything new
- how your medications and complete supplement stack fit together, with daily timing and a clear point for reassessment
The interaction check is one section of the full report. You also get the reasoning behind each recommendation and the evidence references used.
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