A fixed-combination drug is a blend of two or more medications that are combined into a single dosage form. It is commonly used to treat multiple medical conditions that require different medications to be taken at once. Although the term "fixed-combination drug" is often used to describe this type of medication, there are several synonyms that mean the same thing. Some of the synonyms include combination drug, combination product, multiple ingredient product, and fixed dose combination. These synonyms are often used interchangeably, and they all refer to medications that contain more than one active ingredient in a single formulation.