NCK Pharmacology & Drug Calculations: Complete Guide (2026)

Pharmacology is the most consistent source of marks across all NCK papers — and the most consistently under-prepared subject. Many candidates treat drug calculations as secondary. Here is why that is a mistake, and exactly what to do about it.

Why Pharmacology Dominates the NCK Exam

Clinical pharmacology appears across all NCK papers — not just as standalone questions but embedded in scenario questions about management, patient safety, and adverse effects. According to candidate experience across multiple exam cycles, pharmacology content accounts for an estimated 15–25% of total NCK marks across both papers. Miss pharmacology, and you are starting with a significant structural disadvantage.

Practice pharmacology MCQs on NurseFiti →

The Drug Calculation Formulas You Must Memorise

These three formulas cover virtually every calculation question in the NCK exam. Drill them until they are automatic — not just understood, but automatic.

1. Dose/Volume Calculation

Formula: Volume to administer = (Desired dose ÷ Available dose) × Stock volume

Example: Doctor orders 250mg amoxicillin. Available: 500mg/5mL.

→ Volume = (250 ÷ 500) × 5 = 2.5mL

2. IV Drip Rate (drops per minute)

Formula: Drops/min = (Volume in mL × Drop factor) ÷ Time in minutes

Example: 500mL 0.9% NS over 4 hours, standard IV set (drop factor 15 drops/mL).

→ Time = 4 × 60 = 240 min

→ Drops/min = (500 × 15) ÷ 240 = 7,500 ÷ 240 = 31 drops/min

3. Weight-Based Dosing (paediatric)

Formula: Dose = Weight (kg) × Dose per kg

Example: Child weighs 12kg. Ordered: paracetamol 15mg/kg.

→ Dose = 12 × 15 = 180mg

Kenya Essential Medicines List (KEML) — What to Know

All NCK pharmacology questions align to the Kenya Essential Medicines List (KEML) — not to international drug databases. Source: KEMSA — kemsa.co.ke.

High-Yield Drug Categories for NCK

Antibiotics (appear in almost every paper):

First-line for community-acquired pneumonia: Amoxicillin or Amoxicillin-Clavulanate
First-line for UTI: Nitrofurantoin or Trimethoprim-Sulfamethoxazole
TB standard regimen: 2HRZE/4HR (Isoniazid, Rifampicin, Pyrazinamide, Ethambutol)
HIV first-line ART (Kenya guideline 2022): TDF + 3TC + DTG

Cardiovascular drugs:

ACE inhibitors (Enalapril, Lisinopril) — first-line hypertension; monitor for dry cough
Beta-blockers (Atenolol, Carvedilol) — heart failure, post-MI; contraindicated in acute asthma
Furosemide — loop diuretic; monitor electrolytes especially potassium
Digoxin toxicity signs: yellow-green visual disturbances, bradycardia, nausea

Diabetes:

Metformin — first-line type 2 DM; contraindicated in renal impairment (eGFR <30)
Insulin types: Actrapid (rapid), Mixtard (intermediate), Lantus/Glargine (long-acting)
DKA management: IV fluids first, then insulin — never start insulin without correcting dehydration

Emergency drugs (memorise doses and route):

Adrenaline (Epinephrine) — anaphylaxis: 0.5mg IM (1:1000), anterolateral thigh
Magnesium sulphate — eclampsia: 4g IV loading dose, then 1g/hour maintenance
Oxytocin — active management of 3rd stage labour, PPH prevention and treatment
Atropine — bradycardia: 0.5–1mg IV

Psychotropics:

Haloperidol — typical antipsychotic; EPS side effects (akathisia, dystonia)
Clozapine — atypical antipsychotic; agranulocytosis risk → mandatory WBC monitoring
SSRIs (Fluoxetine, Sertraline) — first-line depression; 2–4 week onset delay
Lithium — bipolar disorder; narrow therapeutic index; monitor levels and renal function

Common NCK Pharmacology Exam Traps

1"Which finding requires immediate intervention?" — Know toxicity signs: digoxin (visual changes), lithium (tremors, confusion), gentamicin (tinnitus/hearing loss), warfarin (bleeding)
2Contraindications over indications — NCK frequently asks which patient should NOT receive a drug (e.g., metformin in renal failure, beta-blockers in asthma)
3Route matters — adrenaline for anaphylaxis is IM, not IV (unless cardiac arrest). Getting the route wrong = wrong answer
4KEML first-line vs second-line — NCK follows Kenya MOH guidelines. The first-line drug in the UK or US may not be first-line in Kenya

A Daily Pharmacology Drill

From today until your exam, spend 20 minutes per day on pharmacology:

10 MCQs on drug mechanisms and adverse effects (use NurseFiti's practice bank)
2 drug calculation problems from the three formulas above
Review 5 flashcard entries on drug names, doses, and contraindications

This compounds significantly. 20 minutes × 40 days = 800 minutes of pharmacology drilling. It will show on exam day.

Start your pharmacology drill on NurseFiti →

Also see our KRCHN revision guide for how pharmacology integrates into Paper I strategy.

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📎Sources & References

Kenya Essential Medicines List (KEML) — Ministry of Health Kenya / KEMSA. The authoritative reference for all Kenya MOH drug protocols. kemsa.co.ke
Ministry of Health Kenya — Kenya HIV Prevention and Treatment Guidelines 2022 (ART first-line regimen). health.go.ke
WHO — WHO Model Formulary — reference for drug class information and clinical use. who.int
Nursing Council of Kenya — official website. nckenya.com
NCK Online Services Portal — exam registration and results. osp.nckenya.go.ke

Drug doses and protocols reference the Kenya Essential Medicines List and Kenya MOH guidelines as of 2026. Always verify current clinical protocols before patient care.