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A 31-year-old member asked:

What meds can i take if i'm allergic to penicillin?

3 doctor answers10 doctors weighed in
Dr. Joram Seggev
Specializes in Allergy and Immunology
It depends.: only 10 Of 100 people who claim to be allergic to penicillin really are. Amoxicillin can cause a rash directly. Reaction to an IM injection does not prove allergy. A reaction to penicillin tablets or IV infusion suggests allergy. Most other antibiotics and certain cephalosporins are safe. Not sure - see an allergist/immunologist.
Dr. John Chiu
Allergy and Immunology 57 years experience
Many: You need to avoid penicillin and amoxicillin plus a few related drugs but other antibiotics can usually be tolerated. Cephalosporin cross-sensitivity is possible (as much as 10%) but I have rarely seen one in my practice. The cross-sensitivity in the newer generations of cephalosporin is even rarer.
Dr. Jay Kashkin
Allergy and Immunology 38 years experience
Anything not PCN ok.: Actually the incidence of a true IgE mediated reaction to Penicillin is less than 1% of the population at large. Thankfully there are many alternatives to penicillin for treating susceptible organisms. The big question that occurs almost always is can a penicillin allergic pt be given a cephalosporin . The true incidence of real crossover sensitivity to "cephalo's" is anywhere from 0.5% to 10%

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A 49-year-old member asked:

Can i take fosfomycin if I am allergic to penicillin?

1 doctor answer1 doctor weighed in
Dr. Michael Zacharisen
Allergy and Immunology 33 years experience
Yes: Fosfomycin is an antibiotic made originally from streptomycin and now all synthetic. It should not cross react with penicillin.
A 36-year-old member asked:

Can you take cephalosporin if you are allergic to penicillin?

1 doctor answer1 doctor weighed in
Dr. Jeffrey Rosch
Allergy and Immunology 49 years experience
Pcn & Cehalosporins: The conventional number is 10% of penicillin allergic people are also allergic to cephalosporins, however the data is weak since the patient reported incidence of penicillin allergy may only be 10% accurate. There are also 3 generations of cephalosporins and the "cross reactivity" may vary between them. There does seem to be a direct relationship between reaction severity and cross reactivity.
A 42-year-old member asked:

Can you take acidophilus if your allergic to penicillin?

1 doctor answer2 doctors weighed in
Dr. Jonathan Richards
Endodontics 18 years experience
Yes: Acidophilus and penicillin have a low chance of interaction. Acidophilus itself should not contain any cross-reactive allergens similar to penicillin.
A 37-year-old member asked:

What else can I take if I am allergic to penicillin & e-mycin?

1 doctor answer1 doctor weighed in
Dr. Howard Lelvowitz
Internal Medicine 27 years experience
See below: Depends what you are treating Cleocin is good for skin infections avelox for respiratory Cipro (ciprofloxacin) for urine tract infections.
A 39-year-old member asked:

Can you tell me what you suggest if i'm allergic to penicillin, can I take mdma?

1 doctor answer1 doctor weighed in
Dr. Alan Wartenberg
A Verified Doctoranswered
A US doctor answeredLearn more
You shouldn't: But it has nothing to do with penicillin allergy. The two drugs are totally unrelated, but mdma is a dangerous drug in kids, even more so in a 39 year old, who should of given up that kind of nonsense long ago. Many mdma pills are not pure, and may contain other related chemicals, some of which are even more dangerous than the ecstacy itself. Molly, a particular brand of mdma has caused deaths.

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Last updated Sep 29, 2016

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