Active substance refers to the biologically active component of a drug or pharmaceutical product that produces a therapeutic effect on the body. There are several synonyms for the term active substance, including active ingredient, efficacious component, therapeutic agent, pharmacologically active compound, bioactive constituent, and therapeutic substance. These synonyms can be used interchangeably depending on the context in which they are being used. Additionally, it is important to note that active substances can have different chemical structures and modes of action, leading to varying degrees of therapeutic effectiveness and potential side effects. Understanding the synonyms for active substance is crucial in the pharmaceutical industry and medical field to ensure safe and effective treatment for patients.