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October 28th 2019
I'm well aware of long lists of antibiotics to avoid when affected by either conditions. The answer I've yet to find however (despite asking multiple pharmacists/mds), is: What are antibiotics options that are actually SAFE to use for a throat/ear bug when affected by both penicillin allergy and MG?
Geneviève Duperron Pharmacist owner affiliated with Familiprix

Depending of the type of reaction you had with penicillin if it's not anaphylaxis, probably a cephalosporin like Cefzil of Ceftin would be my choice but there are a 5% risk of cross-sensitivity with your penicillin allergy, but under observation I would try it

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