Excipients are inactive substances used in pharmaceutical formulations to support the active ingredients. They help in the manufacturing process, improve stability, and enhance the delivery of the medication. Common excipients include binders, fillers, and preservatives, which ensure that the drug maintains its effectiveness and is safe for consumption. These substances can also influence the drug's release rate and absorption in the body. While excipients do not have therapeutic effects themselves, they play a crucial role in the overall performance of medications, ensuring that patients receive the intended benefits of the active pharmaceutical ingredients.