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
Last reviewed 22 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.
Additive CNS sedation
Amber Does interact with Clonidine?
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.
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 Guanfacine?
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.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive CNS depression
Amber Does interact with Alprazolam?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Chlordiazepoxide?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Diazepam?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Lorazepam?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Nitrazepam?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Oxazepam?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Temazepam?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Zaleplon?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Zolpidem tartrate?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Amber Does interact with Zopiclone?
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.
Evidence: Limited human data, based on case reports and a known mechanism.
Reduced thyroid-hormone effect
Amber Does interact with Levothyroxine?
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.
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.
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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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