A member asked:
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when taking a antibiotic. how long does it take to see an allergic reaction (if you are going to get one) after taking the pill?

1 doctor answer
Dr. Peter Karsant
39 years experience Dentistry
Generally: This occurs with in a few hours or minutes. It can be itching, rash over whole body or more life threatening. You can get tested to see what if anything you are allergic to if you are concerned.
Answered on Apr 15, 2019
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Dr. Michael Zacharisen
33 years experience Allergy and Immunology
There is a commercially available skin test reagent for penicillin testing called Pre-Pen. Unfortunately, this is the only antibiotic where there is a reliable commercial skin test.
Jan 19, 2013

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Related questions:

A 31-year-old member asked:
Dr. Gary Moss
Dr. Gary Moss answered
29 years experience Allergy and Immunology
Quick: True allergic reactions typically happen after the first dose. Other reactions can occur later in the course.
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A 33-year-old member asked:
Dr. Otto Placik
34 years experience Plastic Surgery
Immed or 7-10 days: Paitents may exhibit immediate or delayed type hypersensitivity which can range from immediate symptoms to those delayed by 10 days.
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A 20-year-old female asked:
Dr. Al Hegab
Dr. Al Hegab answered
40 years experience Allergy and Immunology
Depends: on the reaction, which can range from some rash to full anaphylactic shock to other complications, first step is to stop the medicine, at times it mig ... Read More
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A 48-year-old female asked:
Dr. John Chiu
Dr. John Chiu answered
57 years experience Allergy and Immunology
Desensitization: This is known as multiple drug sensitivity syndrome. However i strongly urge you to consult an allergist who will likely give you guidance on what ab ... Read More
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