MedBodh Clinical & Health Administration Series | Editorial date: 2026-10-25
Intramuscular adrenaline (epinephrine) is the first-line medicine for suspected anaphylaxis. Rapid recognition and prompt administration matter; antihistamines and corticosteroids must not delay adrenaline.
Quick Note Sheet
Category: Drug / Emergency
Scope: practical guidance with safety caveats and official source verification.
Important: this is not a substitute for the complete official order, product label or local clinical protocol.
Recognise anaphylaxis
Suspect anaphylaxis when a rapid-onset allergic reaction involves airway, breathing or circulation compromise, with or without skin findings. Stop exposure where feasible, summon emergency help and follow local resuscitation protocols.
Route and concentration
For IM treatment, use adrenaline 1 mg/mL (1:1000) into the anterolateral thigh. Do not confuse it with 0.1 mg/mL (1:10,000) preparations intended for different resuscitation uses. Check the actual ampoule or autoinjector label.
Common IM dosing approach
A widely used weight-based IM dose is 0.01 mg/kg of 1 mg/mL solution (equivalent to 0.01 mL/kg), subject to age/weight-specific maximums and local guidelines. Many protocols use a maximum single IM dose of 0.5 mg in adults; paediatric maximums vary by guideline and age. Repeat after approximately 5 minutes if airway, breathing or circulatory problems persist, following the resuscitation algorithm.
Worked arithmetic example
For a 20 kg child, 0.01 mg/kg calculates to 0.2 mg; using 1 mg/mL solution, the corresponding volume is 0.2 mL. This is an educational calculation, not a substitute for a clinician’s emergency protocol or device-specific instructions.
Concurrent management and safety
Position the patient appropriately, provide oxygen and IV fluids as indicated, monitor pulse, blood pressure and oxygenation, and arrange urgent transfer or observation according to severity. IV adrenaline boluses outside cardiac arrest require specialist expertise and are not interchangeable with IM dosing.
Frequent errors
Do not give subcutaneous injection instead of IM as a routine substitute; do not use steroids or antihistamines as first-line treatment; do not delay adrenaline while waiting for rash or laboratory confirmation.
Practical safety checklist
- Verify the patient, candidate or employee identity and applicable requirements.
- Check the current official instructions, product label or institutional protocol.
- Use a documented independent check for high-risk decisions.
- Record completion, acknowledgements and necessary follow-up.
Frequently asked questions
Can this guide replace an official notice or prescribing protocol?
No. Always use the full current primary source and patient-specific clinical judgment.
Are the examples universally applicable?
No. They illustrate principles; eligibility, drug products and protocols vary.
Primary reference
Medical disclaimer: Educational content for healthcare professionals. Confirm formulations, dose limits and emergency management with current approved guidance.