thanx for the query.
its really not a straight cut: like wat i mean is the fact that your boyfriend reacted to penicillin does not mean he would react to the triple topical antibiotic
Yes, they are all antibiotics but belong to different groups. Your boyfriend would more likely to react to the triple regimen if he has reactions to other aminoglycosides like tobramycin
I would suggest a wound/ulcer/ swab for MCS.
hope this was helpful