Unit 5: Pharmacology and Medication Administration

• Topic 01

  Drug Classifications — Generic vs Brand Names, Schedules, and Forms

  42 questions
• Topic 02

  Routes of Administration — Oral, Topical, Ophthalmic, Otic, Inhaled

  42 questions
• Topic 03

  Parenteral Routes — Intradermal, Subcutaneous, Intramuscular Injections

  46 questions
• Topic 04

  Syringe Selection, Needle Gauge, and Injection Site Identification

  30 questions
• Topic 05

  Dosage Calculation — Metric Conversions and Weight-Based Dosing

  40 questions
• Topic 06

  The Six Rights of Medication Administration

  27 questions
• Topic 07

  Medication Errors — Reporting, Prevention, and Documentation

  45 questions
• Topic 08

  Vaccines — Schedule, Storage, and Administration (VIS Requirements)

  28 questions
• Topic 09

  Controlled Substances — DEA Schedules and Legal Requirements

  45 questions

A few questions from this unit, with the answer and a full explanation. The complete bank is available when you start practising.

1. An MA is administering SubQ insulin to a patient using a pen injector with a 4 mm needle. A colleague suggests that pinching up the skin during injection is unnecessary for such a short needle. Which response is most accurate?

   • A
     A 4 mm needle must always be used at a 90° angle without a skin pinch; skin pinching with pen needles is never recommended
   • B
     For 4 mm needles in most average and overweight patients, skin pinch is generally not required because the needle length alone targets the subcutaneous layer; however, for lean adults, a skin pinch or 45° angle may still be recommended per current guidelines
     Correct answer
   • C
     A 4 mm needle will always reach the muscle at 90° if the patient is lean, so a 45° angle is required in all patients regardless of adipose tissue
   • D
     The colleague is correct for all patients; no SubQ injection requires skin pinching regardless of the needle length used
   Explanation

   Current guidelines (including FDA-cleared pen needle recommendations) state that 4 mm needles in most adults do not require a skin pinch at 90° because this length typically targets subcutaneous tissue. However, for very lean individuals, a skin pinch is still recommended. This is an evolving area of practice informed by newer ultra-short pen needle availability. Key takeaway: For ultra-short pen needles (4–5 mm), skin pinch is usually unnecessary in average and overweight patients but may still be needed in very lean individuals.

2. Which route of administration bypasses first-pass metabolism by absorbing directly into systemic circulation through mucous membranes?

   • A
     Oral (swallowed tablet)
   • B
     Rectal via suppository
   • C
     Topical cream on intact skin
   • D
     Sublingual
     Correct answer
   Explanation

   The sublingual route places the drug under the tongue, where it is absorbed through the highly vascular sublingual mucosa directly into systemic veins — bypassing the GI tract and liver entirely. This avoids first-pass metabolism, allowing drugs like nitroglycerin to reach therapeutic concentrations rapidly (onset 1–3 minutes). Oral tablets pass through the portal system and are subject to hepatic first-pass metabolism. Key takeaway: Sublingual and buccal routes bypass first-pass metabolism; oral tablets do not.

3. An intramuscular injection deposits medication into which tissue?

   • A
     The muscle belly
     Correct answer
   • B
     The subcutaneous fatty tissue below the dermis
   • C
     The epidermis at the skin surface
   • D
     The periosteum covering the bone
   Explanation

   An intramuscular (IM) injection targets the muscle belly. The needle is inserted at a 90° angle through the skin and subcutaneous tissue into the muscle. Muscles have excellent blood supply, enabling faster drug absorption than the SubQ route and the ability to accommodate larger injection volumes. Key takeaway: IM injection = muscle belly; 90° angle; faster absorption and larger volumes than SubQ.