Drug addiction is a relapsing and chronic brain disorder that is characterized by habitual, compulsive, and pathol. patterns of substance seeking and usage despite the associated severe neg. social and health consequences.This study evaluated the addictive and neurotoxicol. evaluation of the alkaloid extracts of Cannabis sativa (CS), male Carica papaya (CM), Nicotiana tabacum (NT), and Datura stramonium (DS) via neuroinflammatory, neurotransmitter, and oxidative systems.For 90 days, exptl. rats were orally administered the alkaloid extracts in doses of 5, 50, 500, and 2000 mg/kg.Neurobehavioral paradigms were evaluated on days 91 and 92, rats were sacrificed, and striatum homogenate was preparedExpression of addition and neurotoxicity-related genes, alongside biochem. neurotransmitter and cytokine metabolisms, were assessed.The result established the addictive and neurotoxicol. potentials of the alkaloid extracts via behavioral paradigms, coupled with inflammatory, monoaminergic, apoptotic, cholinergic, oxidative, and glutamatergic neurotransmission systems modulations.However, the observed neurotoxicity of the psychoactive plants′ alkaloids was not directly proportional to their addictiveness as the psychoactive plants ranked CS > NT > DS > CM in addictiveness but ranked DS > NT > CS > CM for toxicol. potentials, as measured using related behavioral, neurotransmitter, apoptotic and inflammatory systems.The toxicol. effects of the psychoactive plants′ alkaloids are mostly expressed at high doses.