DRUG CALCULATION MASTERY: INJECTABLE
MEDICATIONS
COMPLETE PRACTICE QUESTION BANK
100 Expert-Level Injectable Medication Calculations
Nursing & Pharmacy Exam Preparation
Perfect for: NCLEX-RN • NCLEX-PN • Pharmacy Technician • Nursing
School Finals • Clinical Competency Exams • Immunization Certification
Topics Covered: Intramuscular (IM) • Subcutaneous (SC) • Intradermal (ID)
• Insulin Administration • Mixed Insulins • Reconstitution • Heparin & LMWH •
Emergency Epinephrine • Pediatric Vaccinations • Vitamin Injections
Skill Level: Beginner → Advanced
Total Questions: 100
Every question includes step-by-step solutions, clinical context, and safety notes.
Designed by healthcare educators for maximum exam success.
TABLE OF CONTENTS
Section Questions Topic
1 1–10 Intramuscular (IM) Injections
2 11–20 Subcutaneous Insulin
3 21–30 Reconstitution for IM
4 31–40 Subcutaneous Heparin & LMWH
5 41–50 Pediatric IM Injections
6 51–60 Intradermal (ID) Injections
7 61–70 Mixed Insulin Administration
nursing
,Section Questions Topic
8 71–80 Emergency IM Epinephrine
9 81–90 Vitamin & Hormone IM Injections
10 91–100 Pediatric Vaccinations
HOW TO USE THIS DOCUMENT
1. Attempt each question independently before checking the answer.
2. Show all your work — examiners award partial credit for correct
methodology.
3. Review the safety notes — injection technique errors can cause
complications.
4. Time yourself — aim for 2–3 minutes per question on exam day.
5. Flag difficult questions for later review.
CLINICAL SAFETY REMINDERS
• Always verify the order against the medication administration record
(MAR).
• Check allergies before administering any medication.
• Use the correct needle for the route and patient size.
• Rotate injection sites to prevent tissue damage and lipohypertrophy.
• Do NOT aspirate with SC heparin or insulin injections.
• Do NOT massage SC heparin or insulin injection sites.
• Draw up Regular insulin before NPH when mixing — “Clear before
Cloudy.”
• Use a tuberculin syringe for small-volume injections (< 1 mL).
• When in doubt, ask — patient safety is everyone’s responsibility.
nursing
,Question 1: Injectable Medication – Mixed Insulin
Patient: Ms. Cooper, 56 years old, Type 1 Diabetes
Order: - Regular insulin 8 units + NPH insulin 18 units SC before breakfast
Available: - Regular insulin 100 units/mL - NPH insulin 100 units/mL
Question: a) What is the total volume to be injected? b) In what order should you
draw up the insulins?
Answer
Part a – Total volume:
Step 1: Calculate volume for each insulin. - Regular: 8 units / 100 units/mL =
0.08 mL - NPH: 18 units / 100 units/mL = 0.18 mL
Step 2: Calculate total volume. - Total = 0.08 mL + 0.18 mL = 0.26 mL - Or in
units: 8 + 18 = 26 units on an insulin syringe
Part b – Drawing order:
Step 1: Remember the mnemonic: “Clear before Cloudy” - Draw up Regular
(clear) insulin FIRST - Then draw up NPH (cloudy) insulin
Step 2: Rationale: If NPH contaminates the Regular vial, it will not significantly
affect the rapid action of Regular. The reverse would alter the NPH’s time-action
profile.
Answer: a) 0.26 mL (26 units) | b) Draw Regular first, then NPH
Question 2: Injectable Medication – Mixed Insulin
Patient: Ms. Cooper, 69 years old, Type 1 Diabetes
Order: - Regular insulin 10 units + NPH insulin 20 units SC before breakfast
Available: - Regular insulin 100 units/mL - NPH insulin 100 units/mL
Question: a) What is the total volume to be injected? b) In what order should you
draw up the insulins?
Answer
Part a – Total volume:
nursing
, Step 1: Calculate volume for each insulin. - Regular: 10 units / 100 units/mL =
0.1 mL - NPH: 20 units / 100 units/mL = 0.2 mL
Step 2: Calculate total volume. - Total = 0.1 mL + 0.2 mL = 0.3 mL - Or in units:
10 + 20 = 30 units on an insulin syringe
Part b – Drawing order:
Step 1: Remember the mnemonic: “Clear before Cloudy” - Draw up Regular
(clear) insulin FIRST - Then draw up NPH (cloudy) insulin
Step 2: Rationale: If NPH contaminates the Regular vial, it will not significantly
affect the rapid action of Regular. The reverse would alter the NPH’s time-action
profile.
Answer: a) 0.3 mL (30 units) | b) Draw Regular first, then NPH
Question 3: Injectable Medication – Pediatric Vaccination
Patient: Baby Ava, 19 months old
Order: Influenza vaccine 0.5 mL IM
Available: Influenza vaccine in a 5 mL multi-dose vial
Question: a) How many mL will you withdraw from the vial? b) What needle size
and length is appropriate for this patient?
Answer
Part a – Volume to withdraw:
Step 1: The order specifies 0.5 mL. - Withdraw exactly 0.5 mL from the vial.
Part b – Needle selection:
Step 1: Consider the patient’s age and muscle mass. - For a 19-month-old infant,
the vastus lateralis is the preferred IM site.
Step 2: Select appropriate needle. - Gauge: 22–25 gauge - Length: 5/8 inch to 1
inch - A 25 gauge, 5/8 inch needle is commonly used for infant IM injections.
Answer: a) 0.5 mL | b) 22–25 gauge, 5/8–1 inch needle (vastus lateralis site)
nursing
MEDICATIONS
COMPLETE PRACTICE QUESTION BANK
100 Expert-Level Injectable Medication Calculations
Nursing & Pharmacy Exam Preparation
Perfect for: NCLEX-RN • NCLEX-PN • Pharmacy Technician • Nursing
School Finals • Clinical Competency Exams • Immunization Certification
Topics Covered: Intramuscular (IM) • Subcutaneous (SC) • Intradermal (ID)
• Insulin Administration • Mixed Insulins • Reconstitution • Heparin & LMWH •
Emergency Epinephrine • Pediatric Vaccinations • Vitamin Injections
Skill Level: Beginner → Advanced
Total Questions: 100
Every question includes step-by-step solutions, clinical context, and safety notes.
Designed by healthcare educators for maximum exam success.
TABLE OF CONTENTS
Section Questions Topic
1 1–10 Intramuscular (IM) Injections
2 11–20 Subcutaneous Insulin
3 21–30 Reconstitution for IM
4 31–40 Subcutaneous Heparin & LMWH
5 41–50 Pediatric IM Injections
6 51–60 Intradermal (ID) Injections
7 61–70 Mixed Insulin Administration
nursing
,Section Questions Topic
8 71–80 Emergency IM Epinephrine
9 81–90 Vitamin & Hormone IM Injections
10 91–100 Pediatric Vaccinations
HOW TO USE THIS DOCUMENT
1. Attempt each question independently before checking the answer.
2. Show all your work — examiners award partial credit for correct
methodology.
3. Review the safety notes — injection technique errors can cause
complications.
4. Time yourself — aim for 2–3 minutes per question on exam day.
5. Flag difficult questions for later review.
CLINICAL SAFETY REMINDERS
• Always verify the order against the medication administration record
(MAR).
• Check allergies before administering any medication.
• Use the correct needle for the route and patient size.
• Rotate injection sites to prevent tissue damage and lipohypertrophy.
• Do NOT aspirate with SC heparin or insulin injections.
• Do NOT massage SC heparin or insulin injection sites.
• Draw up Regular insulin before NPH when mixing — “Clear before
Cloudy.”
• Use a tuberculin syringe for small-volume injections (< 1 mL).
• When in doubt, ask — patient safety is everyone’s responsibility.
nursing
,Question 1: Injectable Medication – Mixed Insulin
Patient: Ms. Cooper, 56 years old, Type 1 Diabetes
Order: - Regular insulin 8 units + NPH insulin 18 units SC before breakfast
Available: - Regular insulin 100 units/mL - NPH insulin 100 units/mL
Question: a) What is the total volume to be injected? b) In what order should you
draw up the insulins?
Answer
Part a – Total volume:
Step 1: Calculate volume for each insulin. - Regular: 8 units / 100 units/mL =
0.08 mL - NPH: 18 units / 100 units/mL = 0.18 mL
Step 2: Calculate total volume. - Total = 0.08 mL + 0.18 mL = 0.26 mL - Or in
units: 8 + 18 = 26 units on an insulin syringe
Part b – Drawing order:
Step 1: Remember the mnemonic: “Clear before Cloudy” - Draw up Regular
(clear) insulin FIRST - Then draw up NPH (cloudy) insulin
Step 2: Rationale: If NPH contaminates the Regular vial, it will not significantly
affect the rapid action of Regular. The reverse would alter the NPH’s time-action
profile.
Answer: a) 0.26 mL (26 units) | b) Draw Regular first, then NPH
Question 2: Injectable Medication – Mixed Insulin
Patient: Ms. Cooper, 69 years old, Type 1 Diabetes
Order: - Regular insulin 10 units + NPH insulin 20 units SC before breakfast
Available: - Regular insulin 100 units/mL - NPH insulin 100 units/mL
Question: a) What is the total volume to be injected? b) In what order should you
draw up the insulins?
Answer
Part a – Total volume:
nursing
, Step 1: Calculate volume for each insulin. - Regular: 10 units / 100 units/mL =
0.1 mL - NPH: 20 units / 100 units/mL = 0.2 mL
Step 2: Calculate total volume. - Total = 0.1 mL + 0.2 mL = 0.3 mL - Or in units:
10 + 20 = 30 units on an insulin syringe
Part b – Drawing order:
Step 1: Remember the mnemonic: “Clear before Cloudy” - Draw up Regular
(clear) insulin FIRST - Then draw up NPH (cloudy) insulin
Step 2: Rationale: If NPH contaminates the Regular vial, it will not significantly
affect the rapid action of Regular. The reverse would alter the NPH’s time-action
profile.
Answer: a) 0.3 mL (30 units) | b) Draw Regular first, then NPH
Question 3: Injectable Medication – Pediatric Vaccination
Patient: Baby Ava, 19 months old
Order: Influenza vaccine 0.5 mL IM
Available: Influenza vaccine in a 5 mL multi-dose vial
Question: a) How many mL will you withdraw from the vial? b) What needle size
and length is appropriate for this patient?
Answer
Part a – Volume to withdraw:
Step 1: The order specifies 0.5 mL. - Withdraw exactly 0.5 mL from the vial.
Part b – Needle selection:
Step 1: Consider the patient’s age and muscle mass. - For a 19-month-old infant,
the vastus lateralis is the preferred IM site.
Step 2: Select appropriate needle. - Gauge: 22–25 gauge - Length: 5/8 inch to 1
inch - A 25 gauge, 5/8 inch needle is commonly used for infant IM injections.
Answer: a) 0.5 mL | b) 22–25 gauge, 5/8–1 inch needle (vastus lateralis site)
nursing
