👉 In the context of medicine, a remnant or residual is a substance that remains after a therapeutic intervention has been completed. It can refer to a specific component of a medication, an ingredient in a dietary supplement, or any substance that is left behind after a procedure such as surgery or chemotherapy. For example, a patient may receive a course of antibiotics and then have a follow-up visit where they are prescribed a "remnant" antibiotic that will be used if the original antibiotic is not effective. This
