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. 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 interaction. 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
CYP3A4 inhibition
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.
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.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
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.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
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.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive blood-pressure lowering
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.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
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.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
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.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive lipid lowering
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.
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.
Additive glucose lowering
Berberine lowers blood sugar, and dapagliflozin does too. The combination is usually well tolerated because dapagliflozin rarely causes low blood sugar on its own, but it is still worth monitoring your glucose when you start berberine and letting your GP know.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Berberine lowers blood sugar on its own. Combined with gliclazide, a drug that can already cause low blood sugar, the effect adds up. If you take both, monitor your glucose more closely when starting berberine and tell your GP, as your gliclazide dose may need adjusting.
Berberine lowers blood sugar on its own. Combined with glimepiride, a drug that can already cause low blood sugar, the effect adds up. If you take both, monitor your glucose more closely when starting berberine and tell your GP, as your glimepiride dose may need adjusting.
Berberine lowers blood sugar on its own. On top of insulin, which can already cause low blood sugar, the effect adds up. If you take both, monitor your glucose more closely when starting berberine and tell your diabetes team, as your insulin dose may need reducing.
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.
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.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Berberine lowers blood sugar, and sitagliptin does too. The combination is usually well tolerated because sitagliptin rarely causes low blood sugar on its own, but it is still worth monitoring your glucose when you start berberine and letting your GP know.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
P-glycoprotein interaction
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.
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.
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 methodologyWant this checked across everything you take?
This page checks the pairs you enter. The personalised Distil report goes further:
- the same graded, cited interaction check across your whole stack, not just the pairs you thought to type in
- where your current routine may be leaving you short of your goals
- the evidence-backed compounds worth adding, and the ones worth dropping
It's a paid report: £79, or £49 for the first 25 customers. The interactions check is one section of it, and you can read a real one in full before you buy.
See a real sample reportSomething missing?
If a supplement or medication you take isn't in our autocomplete, tell us. We go through what people flag every week and add what's missing.