Anaphylaxis Recognition in Pharmacy
How community pharmacists can rapidly recognise anaphylaxis, act on airway, breathing, and circulation signs, and escalate to 999 without delay.
Why this matters
Anaphylaxis is a rapid-onset, life-threatening hypersensitivity reaction that can become fatal within minutes. Community pharmacists are at the front line of allergen exposure through immunisations, dispensing new medicines, and providing food or drug allergy advice, and are often the first healthcare professional a patient reaches when a reaction begins.
The treatment window is narrow. Intramuscular adrenaline is the first-line treatment for anaphylaxis and should be given without delay. Antihistamines alone are never adequate treatment for anaphylaxis, and delays in recognising and treating the condition can be life-threatening. Pharmacists must recognise anaphylaxis rapidly, call 999, and support emergency treatment while waiting for the ambulance.
Underestimation is the key danger. Presentations without urticaria are easily missed, and initial improvement can occasionally be followed by a biphasic reaction several hours later.
Red flags vs more likely benign
| Feature | More likely benign | Red flag ⚠ |
|---|---|---|
| Onset | Gradual over hours; mild and localised | Rapid onset within minutes of a likely trigger; symptoms escalating |
| Airway | Mild throat irritation or nasal congestion | Stridor, hoarse voice, throat tightness, difficulty swallowing |
| Breathing | Stable known asthma with usual symptoms | Acute wheeze, breathlessness, raised respiratory rate, cyanosis |
| Circulation | Flushed or warm; normal pulse | Tachycardia, pallor, clamminess, hypotension, syncope, or collapse |
| Skin / mucosa | Localised hive or itch at contact site | Generalised urticaria or angioedema, although skin signs may be absent |
| Gastrointestinal symptoms | Mild nausea; no systemic features | Sudden abdominal cramps or vomiting alongside airway, breathing, or circulation symptoms |
| Trigger | Known mild intolerance; no systemic reaction | Recent exposure to a likely allergen such as food, medicine, insect sting, or latex before multisystem symptoms |
| Patient state | Anxious but alert, normal colour | Sense of impending doom, extreme anxiety, or sudden collapse |
What to do in pharmacy
Key takeaways
- Suspected anaphylaxis should be treated as a 999 emergency. Intramuscular adrenaline is the first-line treatment and antihistamines are not a substitute.
- Skin signs may be absent. Airway, breathing, or circulation symptoms following a likely allergen exposure are sufficient to act.
- Symptoms can occasionally recur after apparent recovery. All suspected anaphylaxis should be assessed in hospital, even if the patient appears to recover fully.