Monotherapy is a form of treatment in which a single medication or intervention is used to address a particular condition or disease. This approach is often used in medical research to study the effectiveness of a specific drug or therapy without the confounding factors of combining multiple treatments. Monotherapy is commonly used in the development of new drugs or in clinical trials to assess the safety and efficacy of a single intervention. It allows researchers to isolate the effects of a single intervention on a particular condition or disease, which can help in understanding its mechanism of action and determining the most appropriate treatment approach.