What are internal medications primarily characterized by?

Internal medications are primarily characterized by their method of administration, which involves swallowing. This method allows the active ingredients to be absorbed through the digestive system and into the bloodstream, facilitating systemic effects throughout the body. Such medications are typically formulated in forms such as tablets, capsules, liquids, or powders that are designed to be taken orally.

This route of administration is distinct from other methods, such as injections, which directly introduce medications into the bloodstream or body tissues, and topical treatments, which are applied directly to the skin and intended for local effects. While some medications can be absorbed through the skin, this does not define internal medications, which are centered on oral intake and systemic distribution.