Emergency Drug Administration Guidelines

Emergency Drug Administration Guidelines

Category: General Medicine; Pharmacology

This course reviews the most frequently tested emergency medication concepts for medical students and healthcare professionals. Each section explains the drug, its indication, recommended route, dosage, and timing, followed by key take‑aways for rapid recall during emergencies.

Adrenaline in Anaphylaxis

Why adrenaline is the drug of choice

Adrenaline (epinephrine) rapidly reverses the life‑threatening effects of anaphylaxis by stimulating α‑ and β‑adrenergic receptors. This leads to vasoconstriction, bronchodilation, and decreased mucosal edema.

Recommended route and onset

The intramuscular (IM) injection is the preferred route because it provides a reliable, quick onset while minimizing the risk of arrhythmia associated with intravenous administration.

• Typical injection site: anterolateral thigh (vastus lateralis).
• Onset of action: 10–30 minutes, sufficient to stabilize airway and circulation.

Quick IM, quick relief.

Key points for exam preparation

• Remember the dose: 0.3–0.5 mg (1 mg/mL) IM for adults.
• Do NOT give adrenaline orally or by inhalation.
• Repeat dose every 5–15 minutes if symptoms persist.

Ipratropium Bromide in Asthma Management

Mechanism of action

Ipratropium is an anticholinergic bronchodilator that blocks muscarinic receptors, reducing bronchoconstriction. It works best when combined with β2‑agonists.

When to add ipratropium

The drug should be used as an adjunct to β2‑agonists, especially in moderate to severe acute asthma or when a rapid, additive bronchodilatory effect is needed.

• First‑line therapy remains short‑acting β2‑agonists (e.g., salbutamol).
• Ipratropium is added for synergistic airway opening.

Combine for stronger airway opening.

Clinical pearls

• Typical dose: 0.5 mg nebulised every 6 hours.
• Not indicated as monotherapy for mild intermittent asthma.
• Useful in patients with a high bronchial tone or refractory symptoms.

Salbutamol Nebulisation Dose for Adults

Standard dosing

The recommended adult dose for nebulised salbutamol is 5 mg. This dose provides effective bronchodilation during acute asthma exacerbations.

• Delivered via a nebuliser with normal saline.
• Repeat every 20 minutes for up to three doses if needed.

Think 5‑mg, not micrograms for inhalation.

Why 5 mg matters

Lower doses (e.g., 500 µg) are appropriate for metered‑dose inhalers, but nebulisation requires a larger volume to achieve therapeutic airway concentrations.

Oxygen Therapy Threshold in COPD

Understanding SpO₂ targets

Chronic obstructive pulmonary disease (COPD) patients have a blunted hypoxic drive. Supplemental oxygen is indicated when arterial oxygen saturation falls below the critical threshold.

Trigger level

The guideline‑based trigger is SpO₂ < 88 %. Below this level, hypoxemia becomes clinically significant and warrants oxygen supplementation.

• Target range after oxygen therapy: 88–92 %.
• Avoid over‑oxygenation to prevent CO₂ retention.

Remember: 88 % is the “danger zone.”

Naloxone for Opioid Overdose (IM)

Rapid reversal

Naloxone antagonizes opioid receptors, quickly restoring respiration. The intramuscular (IM) route is useful when intravenous access is unavailable.

Recommended dose

The standard adult IM dose is 400 µg (0.4 mg). This amount reliably reverses opioid‑induced respiratory depression.

• If no response after 2–3 minutes, repeat dose.
• Do not exceed 2 mg total without medical supervision.

Think 0.4 mg = 400 µg.

Activated Charcoal Dose for a 4‑Year‑Old Child

Principle of dosing

Activated charcoal is administered at approximately 1 g/kg body weight. For a typical 4‑year‑old weighing 12–15 kg, the volume corresponds to half a standard 250 ml bottle.

Exact volume

The correct volume is half the bottle (125 ml).

• Ensure the preparation is a 10 % suspension.
• Administer within 1 hour of toxin ingestion.

Half‑bottle equals child dose.

Aspirin for Suspected Myocardial Infarction

Why aspirin is essential

Aspirin irreversibly inhibits platelet cyclo‑oxygenase, reducing clot formation during an acute coronary syndrome.

Dosage and administration

The recommended initial dose is 300 mg chewable aspirin given as soon as possible, unless contraindicated.

• Do not substitute with paracetamol or ibuprofen.
• Morphine may be used for pain but does not address the underlying thrombus.

Platelet blocker, heart‑attack first aid.

Sublingual Glyceryl Trinitrate (GTN) Spray for Cardiac Chest Pain

Indication and safety

GTN dilates coronary arteries and reduces myocardial oxygen demand. It is safe in patients with normal blood pressure.

Standard dosing interval

The recommended interval is every 5 minutes until pain relief or a maximum of three doses.

• Monitor blood pressure after each dose.
• Do not exceed the interval if hypotension develops.

Think of a clock’s 5‑minute tick.

Quick Review Checklist

• Adrenaline (IM) for anaphylaxis: effect in 10–30 min.
• Ipratropium: add to β2‑agonist, not first‑line.
• Salbutamol nebuliser: 5 mg adult dose.
• O₂ in COPD: start when SpO₂ < 88 %.
• Naloxone (IM): 400 µg.
• Activated charcoal (4‑yr child): 125 ml (½ bottle).
• Aspirin for MI: 300 mg chewable.
• GTN spray: repeat every 5 min.

Use this checklist before entering any emergency scenario to ensure you remember the critical doses and timing.

Further Reading and Resources

For deeper insight, consult the latest Advanced Cardiovascular Life Support (ACLS) guidelines, the British Thoracic Society asthma protocol, and the World Health Organization recommendations on emergency drug administration.

• ACLS Pocket Guide – 2024 edition.
• British Thoracic Society Guideline for Acute Asthma.
• WHO Emergency Care Toolkit.