How to recognize an adverse drug reaction
Other platforms explain it with text and video. In VMS you practice it on the patient.
Any new symptom after a new drug could be the drug. Spotting a reaction early, and telling an allergy apart from a side effect, prevents harm now and later.
Step by step
Know what to expect
Before giving a drug, know its common side effects and its serious warning signs. [1]
Think about timing
Ask when the symptom started and what drugs were started or changed shortly before. Reactions can appear minutes to weeks after a dose. [1]
Sort the type
A side effect is expected, such as nausea. An allergy involves the immune system, such as hives or swelling. Toxicity comes from too high a level. [1]
Spot anaphylaxis
Skin or lip swelling with breathing trouble, low blood pressure or vomiting after exposure is anaphylaxis. Stop the drug, call for help and give epinephrine into the outer thigh right away. [1]
Stop and support
For other reactions, hold the drug, check vital signs and airway, and stay with the patient. [2]
Tell the prescriber
Describe the drug, the time, the signs and what you did. Use a clear structure such as SBAR. [3]
Update and report
Record the reaction and its type in the allergy list. Report serious reactions through your facility system and the FDA MedWatch program. [1]
Common errors
- Recording a side effect such as nausea as an allergy.
- Giving an antihistamine instead of epinephrine for anaphylaxis.
- Not updating the allergy list after a true reaction.
Practice it in VMS
In VMS you do this on the patient, not on paper: every step goes on the checklist with a score, and in Teach mode Blocky tells you what comes next.
VMS cases that train this skill
Sources
- Open RN, Nursing Pharmacology 2e (CC BY 4.0)
- Open RN, Nursing Skills 2e (Chippewa Valley Technical College) (CC BY 4.0)
- AAMC Core Entrustable Professional Activities (Core EPAs)
Steps adapted from Open RN, Nursing Pharmacology 2e and Open RN, Nursing Skills 2e (Chippewa Valley Technical College), licensed under CC BY 4.0. VMS is not affiliated with these organizations. Updated: 2026-10-11.