Lemon Balm and medications.
Lemon Balm is in the Distil supplement database, evidence Grade B. The page below lists every medication we have explicitly assessed it against.
Lemon balm is a mint-family herb taken as a standardised extract, typically 300 to 900mg a day, with around 600mg used for acute anxiety. It appears to act on the GABA system, a calming pathway distinct from how L-theanine works, which is why the two are sometimes considered separately. The evidence is Grade B for both anxiety and sleep and for digestive complaints like IBS bloating and spasm. Trials by Haybar in 2018 and Scholey in 2014 suggest it may reduce anxiety, stress and sleep disturbance and support mood, though sample sizes are modest and the field is still small. It combines well with valerian for sleep onset, where the pairing has its own Grade B support. Two interactions are worth noting: it adds to the sedation of other CNS depressants, and because it may modulate TSH it is worth using with awareness in people with thyroid conditions. It is very safe, with mild sedation the main effect.
Below are the 13 documented pairs we have explicitly assessed for Lemon Balm: 13 amber. The pairs cluster around 3 mechanisms: Additive CNS sedation, Additive CNS depression, and Reduced thyroid-hormone effect. 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
Additive CNS sedation
Lemon balm can make you drowsy, and clonidine commonly causes drowsiness and tiredness too. Taken together they may add to the sedation and slow your reactions more than either alone. Use with care, particularly around driving, and especially in the first weeks.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Lemon balm can make you drowsy, and guanfacine commonly causes drowsiness and tiredness too. Taken together they may add to the sedation and slow your reactions more than either alone. Use with care, particularly around driving, and especially in the first weeks.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive CNS depression
Lemon balm and alprazolam both calm the nervous system through overlapping pathways. Combining them may mean stronger drowsiness, slower reaction time, and a heavier morning grogginess than either tends to give on its own. Use with care, particularly around driving.
Lemon balm and chlordiazepoxide both calm the nervous system through overlapping pathways. Combining them may mean stronger drowsiness, slower reaction time, and a heavier morning grogginess than either tends to give on its own. Use with care, particularly around driving.
Lemon balm and diazepam both calm the nervous system through overlapping pathways. Combining them may mean stronger drowsiness, slower reaction time, and a heavier morning grogginess than either tends to give on its own. Use with care, particularly around driving.
Lemon balm and lorazepam both calm the nervous system through overlapping pathways. Combining them may mean stronger drowsiness and slower reactions than either tends to give on its own.
Lemon balm and nitrazepam both calm the nervous system through overlapping pathways. Both are used around sleep, so combining them may mean deeper-than-intended sedation and a heavier morning grogginess, made more likely by nitrazepam's long action. Take care around driving the next morning.
Lemon balm and oxazepam both calm the nervous system through overlapping pathways. Combining them may mean stronger drowsiness, slower reaction time, and a heavier morning grogginess than either tends to give on its own. Use with care, particularly around driving.
Lemon balm and temazepam both calm the nervous system through overlapping pathways. Both are taken to help with sleep, so combining them may mean deeper-than-intended sedation and a heavier morning grogginess.
Lemon balm has a mild calming, sleep-promoting effect, so taking it with zaleplon can add to the sedation and leave you groggier than intended. Use with care, particularly around driving the next morning.
Lemon balm and zolpidem both calm the nervous system through overlapping pathways. Both are taken for sleep, so combining them may mean deeper-than-intended sedation and a heavier morning grogginess. Take care around driving the next morning.
Lemon balm and zopiclone both calm the nervous system through overlapping pathways. Both are taken for sleep, so combining them may mean deeper-than-intended sedation and a heavier morning grogginess. Take care around driving the next morning.
Reduced thyroid-hormone effect
Lemon balm has been shown in laboratory studies to dampen the thyroid-stimulating signal, so in theory it could work against your thyroid medication and let some underactive-thyroid symptoms creep back. This has only been seen in the test tube, not in people taking levothyroxine, so it is a precaution rather than a proven problem. If you want to take lemon balm regularly, mention it to the clinician who manages your thyroid and ask for a TSH check a few weeks later so your dose can be reviewed if needed.
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.
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- 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.
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