Go through these in order and stop at the first one that applies. If you are reading this for someone else, answer for them.
Call emergency services for breathing difficulty, facial or throat swelling, fainting, a seizure, or inability to wake the person.
And for anyone, someone who:
Seek urgent reassessment for persistent vomiting, inability to keep fluids down, much less urine than usual, increasing swelling, worsening weakness, or new confusion.
Routine follow-up may be appropriate if a local rash continues after the product is stopped, the wound is not healing, or there are questions about a safer alternative.
Do not restart bacitracin after a suspected allergy unless a clinician confirms that it is appropriate.
Tell healthcare professionals about the reaction so it can be recorded accurately.
And for anyone, someone who:
The article also says
Follow the monitoring instructions provided by the poison center or treating clinician.
After a minor exposure, this may mean watching for vomiting, diarrhea, rash, unusual sleepiness, breathing problems, or changes in urination for a specified period.
People treated for a significant exposure may need repeat blood or urine tests to confirm that kidney function is stable or improving.
Keep these appointments even if symptoms have eased, because early kidney injury does not always cause noticeable symptoms.
Store ointments and other medicines in their original containers, secured away from children.
Read the active-ingredient label because products marketed as “antibiotic ointment” may contain several medicines.
Every sign above is quoted from the sofidex article on Bacitracin overdose. If you are not sure, err upward — it is always reasonable to be checked.