Arecoline

Arecoline is a cholinergic agent, stimulant, and naturally occurring alkaloid found in areca (betel) nuts of the areca palm (Areca catechu) found in South and Southeast Asia. Its effects, depending on the dose, include stimulation, alertness, increased concentration, cognitive enhancement, elation, euphoria, pro-sexual effects, relaxation, reduced anxiety, and sedation, as well as addiction and withdrawal symptoms upon discontinuation. Its effects are described as subtle and it has been likened to a strong cup of coffee. There are also other active constituents of areca nuts, but arecoline is the key active component, with a percentage of ~0.3 to 0.6%. Areca nuts are administered by chewing for 5 to 20 minutes without swallowing. Side effects of arecoline include hypersalivation, hypotension, vertigo, miosis, tremor, and bradycardia, among others. Other adverse effects can include extrapyramidal syndrome and seizures. Addiction and dependence can occur, with withdrawal symptoms including mood swings, anxiety, irritability, and insomnia. Rarely, psychosis can occur during withdrawal in heavy users. Areca nut use, the primary method of consuming arecoline, is highly associated with oral disease and oral cancer. Overdose of arecoline can be treated with antimuscarinic drugs like atropine or scopolamine. The drug acts as a non-selective partial agonist of muscarinic and nicotinic acetylcholine receptors. The major metabolite of arecoline, arecaidine, is a GABA reuptake inhibitor. The subjective effects of arecoline appear to be mediated by muscarinic acetylcholine receptors and not by nicotinic acetylcholine receptors based on animal studies. However, its mechanism of action is still yet to be fully understood and other activities have also been described. The stimulant and addictive effects of arecoline are thought to be due to increased dopaminergic neurotransmission in the mesolimbic pathway of the brain. In terms of chemical structure, arecoline is closely related to nicotinic acid. The use of arecoline, in the form of areca...