Arecoline / Areca Nut Toxicity

 

Arecoline / Areca Nut Toxicity

Substance

Arecoline is one of the main alkaloids in areca (betel) nut. It acts as a muscarinic receptor agonist and is associated with both acute toxicity and long-term health risks. [1]

 

Common Name

檳榔鹼, substance in betel nut 倒吊子: King of the betel nut [2][3].

The main toxic constituents include arecoline, arecaidine, and tannins. Arecoline and its nitrosamine derivatives have been linked to carcinogenicity, while chronic exposure to areca nut is associated with oral submucous fibrosis and oral cancer. [4].

 

Involving system

Arecoline and related alkaloids activate muscarinic receptors and may cause neurotoxicity [5], cardiotoxicity: pathologic heart hypertrophy [6], hepatotoxicity: fatty degeneration [7], and developmental toxicity. Oxidative stress, apoptosis, inflammation, and disrupted signaling pathways are considered important mechanisms.

Oral mucosal damage: [8].

 

Presentation/ Clinical Manifestations

Acute toxicity may present with salivation, nausea, vomiting, abdominal pain, sweating, dizziness, palpitations, tachycardia, hypotension, dyspnea, bronchoconstriction drowsiness, and in severe cases, coma. [9, 10].

OHCA [3].

Chronic chewing is strongly associated with oral submucous fibrosis and oral cancer, especially in Taiwan and South Asia. [11].

 

Toxic Dose: the precise toxic dose in humans remains undefined, animal studies suggest systemic toxicity at doses of approximately 50–100 mg/kg [10].

 

Antidote/ Management

Treatment is mainly supportive. If residual betel nut remains in the mouth, it should be removed immediately and the oral cavity cleaned. Vital signs and mental status should be monitored closely.

Atropine sulfate (0.5–1.0 mg IV) is titrated every 3–5 minutes until bradycardia resolves.

ACLS for a life-threatening arrhythmia [3].

Disposition 

Depends on patient's status of airway, oxygen demand and hemo-dynamic condition.

References

[1]. Wu L, Yao N, Jiang W, Wu P, Liu Y, Ma Y, Ren H, Jin X, Shi H, Zhou X, Feng L. Arecoline regulates glycolipid and endoplasmic reticulum metabolisms in adult grass carp (Ctenopharyngodon idella). Anim Nutr. 2025 Apr 5;21:447-461. https://pubmed.ncbi.nlm.nih.gov/40510831/

[2]. Huang CY, Chuang CH. A Common Fruit but Potentially Hidden Crisis: A Case Report of Betel Nut Intoxication. J Acute Med. 2023 Mar 1;13(1):41-43. https://pmc.ncbi.nlm.nih.gov/articles/PMC10116037/

[3]. Chou CJ, Su HM, Lee HH, Ko YC, Chen PH, Chen BH. Life-threatening cardiac toxicity after chewing inverted nut (pinang-wang). Ann Emerg Med. 2009 Nov;54(5):757-8. https://pubmed.ncbi.nlm.nih.gov/19853786/

[4]. Yu N, Cai W, Zhang C, Cai Q, Zhang Z, Hu Y, Sun Y, Yin K, Ren F, Chang K, Jin M, Li D, Zhang L, Wu H, Li M. The multistep progression of areca nut-induced oral cancer: a mechanistic roadmap from pathogenesis to precision therapy. Life Med. 2026 Mar 27;5(2):lnag011. https://pubmed.ncbi.nlm.nih.gov/42100377/

[5]. Shih YT, Chen PS, Wu CH, Tseng YT, Wu YC, Lo YC. Arecoline, a major alkaloid of the areca nut, causes neurotoxicity through enhancement of oxidative stress and suppression of the antioxidant protective system. Free Radic Biol Med. 2010 Nov 30;49(10):1471-9.https://pubmed.ncbi.nlm.nih.gov/20691257/

[6]. Ho TJ, Chi-Kang Tsai B, Kuo CH, Luk HN, Day CH, Jine-Yuan Hsieh D, Chen RJ, Kuo WW, Kumar VB, Yao CH, Huang CY. Arecoline induces cardiotoxicity by upregulating and activating cardiac hypertrophy-related pathways in Sprague-Dawley rats. Chem Biol Interact. 2022 Feb 25;354:109810. https://pubmed.ncbi.nlm.nih.gov/34999050/

[7]. Cao Z, Mai W, Gan L, Huang L. A metabolomics and proteomics-based study on the metabolic effects of arecoline on the liver. Toxicon. 2025 Jun;260:108338. doi: 10.1016/j.toxicon.2025.108338.  https://pubmed.ncbi.nlm.nih.gov/40216365/

[8]. Peng J, Chen L, Xie J, Wang X, Wang X, Chen C, Wang R, Xie X. EGR1 regulates PDE12 mediated mitochondrial dysfunction to induce oral mucosal epithelial barrier damage in oral submucous fibrosis. Eur J Pharmacol. 2026 May 10;1023:178865. https://pubmed.ncbi.nlm.nih.gov/42000021/

[9]. Chu NS. Effects of Betel chewing on the central and autonomic nervous systems. J Biomed Sci. 2001 May-Jun;8(3):229-36. https://pubmed.ncbi.nlm.nih.gov/11385294/

[10]. Chen X, He Y, Deng Y. Chemical Composition, Pharmacological, and Toxicological Effects of Betel Nut. Evid Based Complement Alternat Med. 2021 Aug 18;2021:1808081. https://pmc.ncbi.nlm.nih.gov/articles/PMC8387188/?utm_source=chatgpt.com

[11]. Ranganathan K, Kavitha L. Clinical aspects of oral cancer and potentially malignant disorders in South and Southeast Asia. Oral Dis. 2025 May;31(5):1406-1419.  https://pubmed.ncbi.nlm.nih.gov/38817004/

 

 Edited by Yu-Jang Su M.D.     May 16, 2026.