What is a key characteristic of fillers used in medications?

Fillers serve a crucial role in medications by providing necessary bulk and aiding in the delivery of the active ingredients, but they do not have therapeutic effects on their own. Their primary function is to ensure that the medication can be manufactured effectively, providing proper consistency and enhancing the stability of the formulation. For instance, fillers may help in achieving the desired tablet size, making it easier for patients to swallow or ensuring uniform distribution of the active ingredient throughout the dosage form.

While some fillers could be artificial, they are not all limited to such substances, as many natural fillers are also utilized. Additionally, fillers do not contribute to the pharmacological action of the drug; instead, they serve a supportive role without influencing the expected therapeutic outcome. It's also important to note that fillers are not the main ingredients, as they do not provide the primary medical effect—this function is reserved for the active ingredients in the medications.