Supplements and Dexamfetamine sulfate.
Dexamfetamine sulfate, sold under the brand names Amfexa, Dexedrine, is a CNS stimulant prescribed for ADHD or narcolepsy.
Dexamfetamine sulfate is a central nervous system stimulant, prescribed in UK practice for ADHD or narcolepsy. The methylphenidate and amfetamine families dominate. Modafinil sits in the same prescribing space for narcolepsy and shift work sleep disorder. The supplement surface that matters is additive sympathomimetic effect. Caffeine at high doses, yohimbe, bitter orange, ephedra (where available), and heavy preworkout formulations can stack on heart rate, blood pressure, and tremor. The MHRA-flagged combinations include MAOIs (hard contraindicated) and SSRIs at higher doses (where serotonin syndrome becomes a concern if combined with anything else serotonergic). Sleep matters too. Stimulant prescribing usually carries a dosing time discipline (avoid late afternoon), and any sleep supplement combination (magnesium, melatonin, glycine) should be timed accordingly. Cardiovascular screening before starting is recommended by NICE.
Below are the 4 documented pairs we have explicitly assessed against Dexamfetamine sulfate in the Distil database: 4 amber. The pairs cluster around 2 mechanisms: Calming effect vs stimulant (opposing) and Additive sympathomimetic activity. 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
Last reviewed 17 June 2026. Each interaction below is assessed against PubMed-indexed evidence.
Calming effect vs stimulant (opposing)
Amber Does Ashwagandha interact with ?
Ashwagandha is calming and mildly sedating, while dexamfetamine is a stimulant, so the two pull in opposite directions. In theory ashwagandha could take the edge off how well your medication works, or change how settled or wired you feel. No studies have tested the two together in people, so this is a watch-and-see caution rather than a hard rule. If you take both, keep an eye on whether your focus, sleep, or heart rate feel different, and do not change your stimulant dose without your prescriber knowing.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Additive sympathomimetic activity
Amber Does L-Tyrosine interact with ?
L-tyrosine is the raw material your body turns into dopamine and noradrenaline, the same brain chemicals dexamfetamine raises. Taking the two together could in theory add to a stimulant's effects, such as a faster heart rate, higher blood pressure, jitteriness or trouble sleeping, though supplemental tyrosine's effect on top of the medicine is likely to be modest. If you take a stimulant, mention any tyrosine supplement to your prescriber, start at a low dose, and keep an eye on your heart rate and how wired or restless you feel.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does Panax Ginseng interact with ?
Panax ginseng has a mild stimulant-like effect on the nervous system, so taking it alongside dexamfetamine could add to that stimulation. In practice that might mean more trouble sleeping, jitteriness or a faster heartbeat. This has not been tested directly, so it is a cautious flag rather than a strong warning. If you take dexamfetamine, it is worth telling the doctor who manages it before you start ginseng, and keeping an eye on your sleep, restlessness and heart rate.
Evidence: Based on an established mechanism, with no direct study of this exact combination yet.
Reviewer-flagged: awaiting clinical-reviewer sign-off.
Amber Does Rhodiola Rosea interact with ?
Rhodiola is a mildly stimulating herb, and dexamfetamine is a stimulant for ADHD. Taken together they could add up, so you might notice more jitteriness, a faster heartbeat, raised blood pressure, anxiety, or trouble sleeping. If you want to use both, start rhodiola low, watch how you respond, and tell the person who prescribes your dexamfetamine.
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 (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.
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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 same graded, cited interaction check across your whole stack, not just the pairs you thought to type in
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