Hepatitis B vaccine - what you need to know: when to get help
Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
1
Is any of this happening now?
Call 911
Call emergency services for difficulty breathing, swelling of the face or throat, widespread hives, collapse, severe weakness, or other signs of a serious allergic reaction.
Other emergency signs, for anyone
Someone who is struggling to breathe, gasping, choking, or cannot get words out
Someone who has chest pain, tightness or pressure lasting more than a few minutes
Someone who has sudden weakness or drooping on one side of the face or body, slurred speech, or sudden confusion
Someone who is unconscious, or cannot be woken
Someone who is bleeding heavily and it will not stop with firm pressure
Someone who has had a seizure that will not stop, or does not wake up afterwards
Someone who has lips or skin that look pale, blue, grey or blotchy
Someone who you believe has taken an overdose or swallowed something poisonous
2
Is any of this happening?
Be seen today
Seek prompt medical advice after contact with blood or body fluids if you may not be fully protected.
Post-exposure treatment works best when assessed quickly.
3
Does any of this apply?
Book an appointment
Contact your healthcare team during routine hours if injection-site pain or swelling is getting worse rather than improving, fever persists, or side effects interfere with normal activity.
Also contact them if you miss a later dose or are unsure whether your series is complete.
Every sign above is quoted from the sofidex article on Hepatitis B vaccine - what you need to know. If you are not sure, err upward — it is always reasonable to be checked.