Supplements and Glimepiride.
Glimepiride, sold under the brand name Amaryl, is classified under "drugs used in diabetes" in the BNF.
Glimepiride (UK brand names Amaryl) sits at NHSBSA prescribing rank 208 in the 2024/25 PCA statistics. The BNF classifies it under "drugs used in diabetes". This means it sits outside the high-volume therapeutic classes (statins, PPIs, ACE inhibitors, SSRIs) where supplement-interaction surfaces are densely studied, and the published evidence base for specific supplement pairs is correspondingly thinner. Where interactions are documented in the Distil database, they are listed below with their clinical-reference citation; where pairs have not been explicitly assessed, the missing-item form at the bottom of the page routes them into our next curation pass. Anyone combining Glimepiride with a regular supplement stack benefits from explicit GP or pharmacist awareness rather than assuming no interaction exists by default.
Below are the 8 documented pairs we have explicitly assessed against Glimepiride in the Distil database: 8 amber. The pairs cluster around 2 mechanisms: Reduced glucose control and Additive glucose lowering. Every call is cited to either a clinical reference (PMID) or the British National Formulary. Anything not on this list is either still to be assessed or beyond our database scope. The checker beneath surfaces assessments by supplement, and the missing-item form at the bottom of the page routes any uncatalogued supplement into our next curation pass.
Documented interactions
Reduced glucose control
Melatonin can blunt the body's insulin response and raise blood sugar after eating, which works against a diabetes medicine like glimepiride that is trying to lower it. The effect is strongest when melatonin and food are taken close together, so if you take glimepiride it is best to keep melatonin well away from your evening meal and to mention it to your prescriber, especially if your blood sugar is being monitored.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive glucose lowering
Alpha lipoic acid can lower blood sugar by improving how your body responds to insulin. Glimepiride already lowers blood sugar, so the two may add up and could push your glucose too low. If you take both, monitor your blood glucose, especially in the first few weeks, and your doctor may need to reduce the glimepiride dose.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
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.
Bergamot can lower blood sugar on its own, and glimepiride already lowers it, so the two together may add up and could push your glucose too low. Monitor your blood glucose, especially when you start bergamot or change the dose, and tell your GP, who may need to adjust the glimepiride.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Oat beta-glucan slows the rise in blood sugar after meals and can modestly lower blood sugar over time. Glimepiride is a sulfonylurea that can cause low blood sugar, so adding regular beta-glucan may add to that effect. If you start taking it regularly, monitor your glucose for the first few weeks and tell your GP, who may want to review your glimepiride dose.
Garlic supplements may lower blood sugar a little on their own. Glimepiride already lowers blood sugar and can push it too low, so taking the two together may add up. If you take both, monitor your blood glucose, especially in the first few weeks, and your doctor may need to adjust the glimepiride dose.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Holy basil (tulsi) may lower blood sugar on its own. Glimepiride is a sulfonylurea that already lowers blood sugar and carries one of the highest risks of pushing it too low, so taking the two together may add up. If you take both, monitor your blood glucose, especially in the first few weeks, and your doctor may need to adjust the glimepiride dose.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Milk thistle (silymarin) may lower blood sugar, and glimepiride already lowers it, so taking the two together may add up and could push your glucose too low. Glimepiride is a sulfonylurea, the type of diabetes tablet most likely to cause low blood sugar. If you take both, monitor your blood glucose, especially early on, and your doctor may need to adjust the glimepiride dose.
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 (food-supplement interactions only; for drug-drug interactions, the BNF is authoritative). Use the checker below to surface any supplement, 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.