Tesofensine is a chemical compound with a molecular formula of C17H23Cl2NO and a molecular weight of 328.28 g/mol. It is a synthetic small molecule characterized by a structure containing a dichlorophenyl ring system. The compound is typically supplied as a white to off-white solid. Tesofensine is primarily known as a centrally acting triple monoamine reuptake inhibitor (TRI). It functions by blocking the reuptake of the neurotransmitters serotonin, noradrenaline, and dopamine in the brain. This pharmacological profile has been investigated for its potential therapeutic applications in the treatment of central nervous system disorders. Its most prominent clinical development has been focused on the management of obesity, as it was shown to significantly reduce body weight in clinical trials by potentially increasing satiety and energy expenditure. Research has also explored its potential in other conditions like Parkinson's disease. Due to its status as a pharmaceutical active ingredient under development or investigation, it is also relevant in the context of pharmaceutical analysis. Tesofensine and its related compounds (potential impurities or metabolites) are of interest as reference standards or impurity standards for quality control and regulatory purposes during drug development and manufacturing processes.