Nicotine ditartrate dihydrate is a chemical compound that consists of nicotine combined with tartaric acid in a crystalline form with two molecules of water. It is commonly used in pharmaceutical preparations and research applications. The dihydrate form of nicotine ditartrate provides stability and ease of handling in various formulations. This compound may be utilized in nicotine replacement therapy products, such as patches, gums, and lozenges, to aid individuals in quitting smoking by reducing withdrawal symptoms. Additionally, nicotine ditartrate dihydrate is employed in laboratory settings for its role in studying nicotine's pharmacological effects and mechanisms of action.