Parenteral Route

The parenteral route is where medication is injected into the patient using a syringe. There are four commonly used parenteral routes: intradermal (ID), subcutaneous (SC), intramuscular (IM), and intravenous (IV).

The choice of which of the parenteral routes to use is determined by the prescriber based on the nature of the medication, the desired onset of the therapeutic effect, and the patient's needs. For example, the test for TB is performed by injecting the purified protein derivative intradermally, which is under the skin. Insulin is injected subcutaneously, although regular insulin can also be administered intravenous. Medications administered intravenously have a faster onset of therapeutic effect than other parenteral routes. Vaccinations, some antibiotics, and other medications are injected intramuscularly.

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