Every pharmaceutical product consists of two main components the API and the excipients. Excipients are the inactive substances that serve as the vehicle or medium for the API. Together, they form a complete drug product. The primary function of the API is to deliver the intended health benefits. For instance, in a pain reliever, the API is the chemical that alleviates pain, while the excipients may include binding agents, preservatives, and fillers that help stabilize and deliver the medication effectively.