Mesaconitine (Aconitum Norditerpenoid Alkaloid · Na+ Channel · Analgesic · Cardiotoxic Reference)

Compound	Mesaconitine
Chemical class	Alkaloid — Diterpene Alkaloid (C19-norditerpenoid alkaloid; aconitum secondary alkaloid)
CAS	2752-64-9
Primary source	Aconitum carmichaelii (fu zi, Chinese aconite), Aconitum japonicum
Key applications	Analgesic (sodium channel); anti-inflammatory; cardiac ion channel pharmacology; controlled; product-live via Atish extract
Claim strength	Moderate (analgesic mechanism); Toxicological reference
Typical form	Aconitum processed preparations (TCM: zhi fu zi); Atish (A. heterophyllum) extract co-delivers related alkaloids
Buy from Herbuno	Atish Root Liquid Extract (Water Soluble) - Aconitum heterophyllum → Atish (Ativisha) Root Extract Powder - Aconitum heterophyllum →

Name origin: Meso- (middle) + aconitine — referring to its intermediate position in the aconitine alkaloid series, or to its occurrence in the Aconitum (aconite) genus. Mesaconitine is a C19-norditerpenoid alkaloid — the demethyl analogue of aconitine (lacking the N-ethyl group that aconitine has, replaced by N-methyl). Like aconitine, mesaconitine is a potent sodium channel modulator — activating (not blocking) voltage-gated Na+ channels, producing persistent depolarisation. Mesaconitine is approximately equipotent to aconitine in cardiovascular toxicity (both can cause fatal ventricular arrhythmias at very low doses). Traditional context: Mesaconitine co-occurs with aconitine and hypaconitine in Aconitum carmichaelii (fu zi — Chinese aconite), one of the most important and most dangerous TCM herbs. During the standard TCM processing of fu zi (soaking in water, heating, treating with salt or vinegar — “zhi fu zi” preparation), aconitine, mesaconitine, and hypaconitine are hydrolysed to their less toxic benzoylaconine derivatives, dramatically reducing the total diterpene alkaloid concentration and rendering the preparation therapeutically usable. Atish context: The Herbuno Atish (Aconitum heterophyllum) extract is a different, less toxic species primarily containing atisine (not aconitine/mesaconitine). The Atish extract is cited here as the closest commercially available Aconitum product; mesaconitine itself is from A. carmichaelii. Regulatory status: Mesaconitine and aconitine-class diterpene alkaloids are controlled in most markets. Not supplement ingredients.

---

Mesaconitine — Pharmacological Context

Voltage-gated Na+ channel activation (analgesic mechanism at sub-toxic doses): At doses far below cardiovascular toxicity thresholds, mesaconitine’s Na+ channel activation produces temporary sensory nerve depolarisation block — the same mechanism as local anaesthetic action but through a different (activating rather than blocking) mechanism. Traditional TCM analgesia with processed aconite preparations is attributed to this channel-activation-then-block mechanism at very low alkaloid concentrations. Pharmacological reference.

Anti-inflammatory: Mesaconitine has been shown to inhibit NF-κB and reduce pro-inflammatory cytokine production at sub-toxic concentrations in macrophage models. This anti-inflammatory activity is consistent with the traditional TCM use of zhi fu zi for cold-type painful conditions (bi syndrome). Claim strength: Moderate (animal; preclinical).

Cardiac electrophysiology research: Mesaconitine has been an important pharmacological tool for studying cardiac sodium channel activation and ventricular arrhythmia mechanisms — its predictable cardiac arrhythmogenic effects make it a standard research tool for testing antiarrhythmic drug candidates. Research reference.

---

Frequently Asked Questions — Mesaconitine

How does mesaconitine differ from aconitine in toxicity?
Mesaconitine and aconitine have similar acute cardiac toxicity (both cause fatal ventricular arrhythmias via Na+ channel activation) with mesaconitine typically considered approximately equipotent or slightly less potent than aconitine on a molar basis. Both are considered equally dangerous — the lethal dose of mesaconitine in humans is estimated at similar milligram ranges to aconitine (very low). The coexistence of both alkaloids in Aconitum preparations means that the total ester alkaloid content (aconitine + mesaconitine + hypaconitine) is the relevant safety metric for quality control of processed aconite preparations.

What is hypaconitine and how does it relate to the aconitum alkaloid triad?
The three primary toxic ester alkaloids in Aconitum carmichaelii are aconitine, mesaconitine, and hypaconitine — commonly called the “aconitum triad.” Hypaconitine is the N-methyl analogue with a hypoaconitine skeleton (demethyl at C-1 position). The relative proportions of all three vary by species, growing region, and processing. TCM quality standards for processed fu zi specify maximum limits for total ester alkaloid content (aconitine + mesaconitine + hypaconitine) — Chinese Pharmacopoeia specifies <0.02% (200 μg/g) for the raw herb and lower limits for processed preparations. This quality standard is the pharmacopoeial operationalisation of traditional detoxification assessment.

Can mesaconitine be used topically without cardiac toxicity?
Transdermal absorption of aconitum alkaloids is a real toxicity risk — multiple cases of poisoning from handling fresh Aconitum plants or incorrectly prepared preparations are documented. However, at the very low concentrations present in some traditional topical liniment preparations (designed for external pain relief), the transdermal absorption is slow enough to avoid systemic toxic concentrations when applied to limited skin areas without occlusion. Traditional topical aconite liniments have been used empirically for centuries. Modern preparations require quantified alkaloid content to ensure safety margins.

How does TCM zhi fu zi processing reduce mesaconitine?
Zhi fu zi (processed aconite) uses multiple processing steps: soaking in water removes water-soluble alkaloids; heating (boiling with water and/or salt) hydrolyses the labile acetyl and benzoyl ester groups of aconitine, mesaconitine, and hypaconitine to produce benzoylaconine, benzoylmesaconine, and benzoylaconine respectively — these deacetylated derivatives have approximately 1,000-fold lower cardiac toxicity than the parent ester alkaloids. Extended boiling further hydrolyses to aconine (carboxylic acid form), essentially non-toxic. Chinese Pharmacopoeia processing standards require measurable reduction in ester alkaloid content as a quality criterion.

Related compounds: Aconitine, Strychnine, Colchicine, Atropine

---

Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.

← HerbIQ Compound Index · HerbIQ P02: Extraction · HerbIQ P03: Delivery