Nicotine Polacrilex, also known as nicotine resin complex, is a pharmaceutical-grade resin that contains nicotine. It is commonly used as a smoking cessation aid to help individuals quit smoking by reducing withdrawal symptoms. The USP (United States Pharmacopeia) and EP (European Pharmacopoeia) indicate that it meets the standards set for purity and quality in the United States and Europe, respectively. Nicotine Polacrilex is often formulated into various nicotine replacement therapies, such as nicotine gum and lozenges, which deliver controlled doses of nicotine to alleviate cravings and withdrawal symptoms associated with quitting smoking. This resin complex works by binding to nicotine receptors in the brain, mimicking the effects of nicotine from smoking without the harmful toxins found in tobacco smoke.