What is what does efficacious means?

Efficacious means having the ability to produce the desired effect or results. It refers to something that is effective, successful, and efficient in achieving its intended purpose. For example, an efficacious medicine is one that can effectively cure a disease, an efficacious leader is one who is able to bring positive changes in an organization or society, and an efficacious solution is one that can solve a problem in a practical and effective way. Efficacious is often used to describe things that have been proven to work in a reliable and consistent manner.