The practice is rooted in basic nicotine toxicokinetics. Nicotine is a weak base (pKa ≈ 8.0) that exists in equilibrium between ionized and unionized forms. Manipulation of the pH will …

Vitamin A is a fat-soluble nutrient essential for vision, immune function, cellular differentiation, and maintenance of epithelial tissues. It comes from the diet as preformed vitamin A in animal products …

Allergic reactions to sulfonamide antibiotics, such as sulfamethoxazole in cotrimoxazole, are not simply due to the presence of sulfur. Instead, they arise from specific structural features within the molecule that …

Several pesticide classes act on GABA receptors, but only a subset function as true agonists. Legacy cyclodienes such as dieldrin act as GABA antagonists, blocking chloride channels and producing hyperexcitation. …

Repeated heating, cooling, and reheating of cooking oil triggers thermal oxidation, hydrolysis, and polymerization. These reactions break down triglycerides and generate a complex mixture of harmful compounds. Among the earliest …

Clinical Pearls Pattern recognition is key: Intrahepatic cholestasis → hepatocellular enzymes (AST/ALT) rise alongside cholestatic markers. Extrahepatic cholestasis → disproportionate rise in ALP + GGT, with conjugated hyperbilirubinemia. Confirmatory imaging …

The route of elimination of xenobiotics is determined by their physicochemical properties (lipophilicity, polarity, molecular size), extent of metabolism, and the physiological capacity of excretory organs such as the liver, …

Toxicology Risperidone is a benzisoxazole compound that was approved for use in the United States in 1994 for patients with schizophrenia. It produces antagonism of serotonergic,  dopamine receptor, α-adrenergic, and …