There’s no set answer for this, as the duration of an IV’s effects depends on the individual patient. In some cases, especially those where patients are in desperate need of help, symptom relief may occur right away. For others, the IV will take effect over the course of a few days. The fast-acting capabilities of IV therapy are an advantage over oral medications, such as liquids, tablets, or pills, because they need to pass through the digestive system first, lessening their absorbency and potency.
The length of time that IV fluids stay in the body is also determined on a case-by-case basis. Once a patient’s body has metabolized the fluids and their ingredients, they are excreted from the body. Some people choose to get regular IV treatments to reap their benefits routinely, depending on the type of treatment and the reasons for getting an IV.