Allergy | Allergies to Medications
Care Plan Library
Introduction
This page is part of the Care Plan Building Library used by GeneralPracticeTraining.com.au.
It is designed to support clinicians and practice teams in identifying, documenting, and managing allergies to medications in general practice.
Condition Overview
This snippet focuses on allergic reactions to medications, which are distinct from non-allergic side effects listed in Consumer Medicine Information (CMI).
Any medication, including prescription medicines and over-the-counter products purchased from pharmacies or supermarkets, can cause an allergic reaction in some people. Reactions may be mild or severe and can include life-threatening anaphylaxis.
Early recognition, accurate diagnosis, clear documentation, and patient education are essential to prevent re-exposure and serious harm.
Care Plan Snippet – Medication Allergy Management (Table Format)
Care Plan Details
Item: Allergy and risk management
(May be incorporated into GP Chronic Condition Management Plan – Medicare item 965 where relevant)
Date: [Insert date]
Patient Details
Patient: [Patient name], [DOB], [Contact details]
GP Details
GP: [Doctor name], [Clinic name]
GP Management Plan – Problems / Goals / Treatments / Arrangements
| Area | Patient problem / risk | SMART goal | Key actions and advice | Arrangements and follow-up |
|---|---|---|---|---|
| Suspected medication allergy | History of allergic symptoms after medication use | Identify causative medication within 3 months | Take detailed history. Distinguish allergy from side effects. Review CMI and medication list. | GP assessment. Allergy recorded clearly in medical record. |
| Known medication allergy | Risk of repeat exposure | Avoid re-exposure permanently | Educate patient on medication to avoid. Update allergy alerts in clinical software. | Ongoing review. Alerts checked before prescribing. |
| Risk of anaphylaxis | Potential life-threatening reaction | Prevent severe allergic reaction | Provide severe allergic reaction action plan. Educate on symptom recognition. | Regular review. Emergency plan documented. |
| Adrenaline requirement | High-risk allergy | Ensure patient can treat anaphylaxis | Prescribe adrenaline autoinjector. Educate on correct use. Advise carrying mobile phone at all times. | Review technique regularly. Ensure device in date. |
| Medication interactions | Increased severity of reactions | Reduce complicating factors | Avoid medications that worsen reactions where possible (eg beta blockers). | Medication review. |
| Unclear diagnosis | Uncertain allergy status | Confirm diagnosis safely | Refer to allergist/clinical immunologist for testing or supervised challenge if appropriate. | Specialist referral and follow-up. |
Medications Commonly Associated with Allergies
Medications more commonly associated with allergic reactions include:
- Aspirin and non-steroidal anti-inflammatory drugs (NSAIDs)
- Antibiotics, especially penicillin and sulfonamides
- Chemotherapy agents
- Medications for autoimmune disease
- Corticosteroid creams or lotions
- HIV medications
Most people are allergic to one medication only, but some may react to more than one.
Severe Allergic Reaction (Anaphylaxis)
Symptoms may include:
- Difficult or noisy breathing
- Swelling of the tongue or throat
- Difficulty speaking or hoarse voice
- Wheezing or persistent cough
- Dizziness, collapse, pallor
- Floppiness in young children
Emergency management:
- Administer adrenaline immediately
- Call 000 and request an ambulance
Patients at risk should carry:
- An adrenaline autoinjector
- A written action plan
- Medical identification jewellery
Delayed and Generalised Allergic Reactions
Some medication allergies can occur days or weeks after starting treatment and may include:
- Generalised rash or hives
- Fever and joint pain
- Serum sickness–like illness
- Kidney inflammation
- Anaemia or relapse of previous hepatitis
These reactions require medical review and documentation.
Diagnosis Considerations
Diagnosis is based on:
- Detailed clinical history
- Symptom diary
- Specialist assessment
Allergists may use:
- Skin prick testing or blood tests (for some medications)
- Graded challenge testing under strict supervision
- Desensitisation protocols when medication is essential
Unproven allergy testing methods should be avoided.
Special Notes on Specific Medications
Aspirin and NSAIDs
Allergic reactions differ from dose-related side effects. Patients with asthma, hay fever, or hives are at higher risk.
Sulfonamide antibiotics
Allergy does not imply sensitivity to sulfur, sulfites, or non-antibiotic sulfonamides.
Review and Follow-up
Medication allergies should be reviewed periodically to ensure:
- Accurate documentation
- Patient understanding
- Adrenaline devices are current
- Prescribing remains safe
Any new reaction requires reassessment and potential specialist referral.