The reason for using the parenteral route to administer medication includes?

AIIMS Bhatinda NO - 2019

Pharmacology

Easy

Appeared in: AIIMS Bhatinda NO - 2019

Explanation

The parenteral route bypasses the gastrointestinal (GI) tract, avoiding the unpredictable nature of GI absorption and the first-pass effect in the liver.
By delivering the drug more directly into the systemic circulation (especially the intravenous route), it achieves a much faster onset of action.
This rapid effect is critical in emergency situations where immediate therapeutic action is required.
It is also the necessary route for drugs that are poorly absorbed or destroyed by digestive juices (e.g., insulin).

Option A: The duration of action for parenteral medications is highly variable and not universally longer than oral medications. An IV injection has a very short duration, while a depot injection has a very long one.
Option B: The parenteral route is more expensive than the oral route. It requires sterile drug formulations, specialized equipment (needles, syringes), and administration by a skilled professional.
Option D: This option is incorrect because a valid reason for using the parenteral route is listed among the choices (Option C).

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Routes of Medication Administration as background academic context rather than a clinical decision trigger.
Nurses choose the parenteral route in emergencies (e.g., anaphylaxis, cardiac arrest) for its rapid onset of action.
This route is essential for patients who are unconscious, unable to swallow (dysphagia), or experiencing nausea and vomiting, as the oral route is not feasible.
It is also required for medications that would be destroyed by stomach acid or digestive enzymes, such as insulin.

How to Approach the Question

First, understand the question is asking for a primary advantage or reason for using the parenteral route.
Evaluate each option based on fundamental pharmacological principles.
Analyze Option A: 'Longer duration of action'. Recall that duration is formulation-dependent (e.g., IV is short, depot is long). This is not a universal advantage.
Analyze Option B: 'Least expensive'. Recall that parenteral administration involves costs for sterile supplies and skilled personnel, making it more expensive than the oral route.
Analyze Option C: 'More rapid absorption'. Recall that bypassing the GI tract and first-pass metabolism is a key feature of the parenteral route, leading to a faster onset of action. This is a major and consistent advantage.
Based on this analysis, conclude that rapid absorption is the most accurate and fundamental reason for choosing the parenteral route among the given options.

Concept Tested & Keywords

Q45WCEBzrXY11ZtJaVan9x

E6 Pharmacology Nursing Lilley 11e Part 1 p. 39-41

E6 Pharmacology Nurses Shanbhag 3e p. 13-15

E6 Pharmacology KD Tripathi Essentials 9e Part 1 p. 31-33