Questions
2 questions per paper
Difficulty
Medium
Importance
High yield for University and Clinical Board Exams
Overview
Principles of drug administration encompass the systematic delivery of medication to ensure therapeutic efficacy while minimizing adverse effects. Mastering these concepts is critical for clinical practice and forms a significant portion of pharmacology examinations. Students must understand the pharmacokinetic implications of various routes and the rigid safety protocols that prevent medication errors.
Routes of Drug Administration
Routes are categorized primarily into enteral and parenteral pathways, each dictating the speed and bioavailability of the drug. Understanding the distinction is vital for predicting the onset of action and avoiding first-pass metabolism.
- Enteral: Oral, Sublingual, Buccal, and Rectal
- Parenteral: Intravenous (IV), Intramuscular (IM), Subcutaneous (SC)
- IV route provides 100% bioavailability instantly
- Sublingual avoids first-pass metabolism due to direct absorption into systemic circulation
- Rectal route is useful for unconscious patients or those with severe vomiting
Rights of Medication Administration
To ensure patient safety and prevent clinical errors, healthcare providers strictly adhere to the 'Rights' of administration. These protocols are standardized safety checks used in clinical environments and frequently tested in board and viva examinations.
- Right Patient, Right Drug, Right Dose
- Right Route, Right Time, Right Documentation
- Right Reason, Right Education, Right Evaluation
- Right to Refuse
- Check expiry dates and patient allergies prior to administration
Dosage Calculation Principles
Precision in dosage calculation is mandatory to avoid toxicity or therapeutic failure. Aspirants must be proficient with conversion factors and the standard formula for dosage determination.
- Formula: Desired (D) / Have (H) x Quantity (Q) = Amount to Administer (X)
- Always cross-check unit conversions (mg to mcg, mL to L)
- Pediatric doses often calculated based on Body Surface Area (BSA)
- IV infusion rate (gtt/min) = (Total volume in mL / Time in min) x Drop factor
- Strict adherence to rounding rules per institution protocol
Formula Sheet
X = (D / H) * Q
Infusion Rate (gtt/min) = (Volume * Drop Factor) / Time (min)
Exam Tip
When asked about routes in exams, always mention the trade-off between speed of onset and the risk of infection or invasiveness.
Common Mistakes
- Confusing the onset of action between sublingual and oral routes
- Failing to convert units (e.g., grams to milligrams) before applying dosage formulas
- Overlooking the impact of first-pass hepatic metabolism on oral bioavailability
More Revision Notes
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