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how long does it take for an allergy to penicillin to appear

A 43-year-old member asked:
Dr. Linda Green
45 years experience Pediatric Allergy and Asthma
Varies: Hives due to drug allergy usually improve within a day or two of stopping the medicine but can last as long as a week or two. It is best to call the d ... Read More

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A 41-year-old member asked:
Dr. Alan Goldsobel
44 years experience Allergy and Immunology
< 7 - 10 days: Antibiotics like penicillin can cause different types of rashes that can vary in how long they persist. The classical true penicillin allergic rash i ... Read More
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Dr. Gary Steven
30 years experience Pediatric Allergy and Asthma
3 to 10 days: Sometimes longer, if the reaction is severe, or you kept taking the penicillin for several days after the rash first appeared.
A 44-year-old member asked:
Dr. Marc Serota
14 years experience Dermatology
No: If you are truly allergic to PCN then Ampicillin is closely related. I would recommend seeing an allergist to evaluate your PCN allergy. Many peop ... Read More
A 31-year-old member asked:
Dr. Joel Gallant
36 years experience Infectious Disease
Depends: That depends on what infection you're treating.
A 32-year-old member asked:
Dr. Joel Gallant
36 years experience Infectious Disease
Depends: That depends on what's infected. The choice of antibiotics is dependent on the type of infection.
A 37-year-old male asked:
Dr. John Chiu
Dr. John Chiu answered
57 years experience Allergy and Immunology
Yes: No cross reactions between these two.
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A 39-year-old member asked:
Dr. Howard Lelvowitz
27 years experience Internal Medicine
See below: Depends on your pcn allergy 2-3 % cross allergy usually ok be careful if you have a bad reaction to pcn.
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A 47-year-old member asked:
Dr. Justin Greiwe
12 years experience Allergy and Immunology
Lots of Options: Depends on the infection. Certain infections call for different antibiotics. Penicillin drugs are usually first line for most problems, however there ... Read More
A 22-year-old member asked:
Dr. Vasu Brown
34 years experience Integrative Medicine
Yes: Yes penicillin allergy can start with rash has a potential at times to build in the body to create a reaction let your doc know each time u receive th ... Read More
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A 22-year-old male asked:
Dr. Nestor Del rosario
34 years experience Addiction Medicine
Many choices: Like me, I am allergic to penicillin. There are other choices which are directed to what is being treated. You have macrolides, lincosides, tetracycli ... Read More
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4 thanks

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