Internal medications are defined as:

Internal medications are medications that are administered inside the body, which includes any form of medication taken orally, rectally, or via other internal routes that deliver the active ingredients directly into systemic circulation. This broad category encompasses various forms of the medication, including tablets, capsules, syrups, and more, which are absorbed in the gastrointestinal tract or other internal pathways.

The other options present medication delivery methods that do not fall under the definition of internal medications. For instance, medications applied topically affect only the outer layers of the skin, serving specific external purposes rather than being absorbed internally. Similarly, while injecting medications into the bloodstream does involve internal administration, it’s a specific method rather than a general definition. Lastly, medications intended to treat external conditions are specifically designed for external application and do not enter the body internally in a way defined for internal medications. Thus, understanding the general definition of how internal medications function is crucial for accurately categorizing different ways of medication administration.