What is a bolus in the context of medication administration?

A bolus, in the context of medication administration, refers to a single, concentrated dose of medication that is given all at once. This method is often used in situations where a rapid therapeutic effect is needed, such as in emergencies or for medications that require an immediate impact on a patient's condition.

By administering the medication in a bolus fashion, healthcare providers can ensure that the desired level of medication is quickly achieved in the bloodstream, allowing for prompt action. For example, a bolus might be used for pain relief, to rapidly control blood pressure, or to provide a quick dose of insulin.

The other options describe different forms of medication administration that do not fit the definition of a bolus: a gradual increase in dosage refers to a titration process, a continuous infusion involves delivering medication steadily over time rather than in a single dose, and a divided dose would involve multiple smaller doses given at intervals throughout the day, which contrasts with the concept of a bolus.