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

A 50-year-old member asked:
Dr. Alan Goldsobel
43 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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A 41-year-old member asked:
Dr. Morris Westfried
45 years experience Dermatology
Up to 30 days: Drug allergies can resolve in a few days and may persist for several weeks until the residual penicillin by products are cleared from body.
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3 thanks
A 50-year-old member asked:
Dr. Linda Green
44 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
A 50-year-old member asked:
Dr. Marc Serota
13 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 38-year-old member asked:
Dr. Mazen Ghani
23 years experience Radiology
Most radiology : Departments are now digital so images are processed quickly.
A 38-year-old member asked:
Dr. Martin Ostro
48 years experience Allergy and Immunology
Within minutes : With contact hives, such as after a dog lick, they appear with minutes. After eating food to which you are allergic your lips and mouth become itchy a ... Read More
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A 41-year-old member asked:
Dr. Otto Placik
33 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 40-year-old member asked:
Dr. Manav Singla
22 years experience Allergy and Immunology
15 minutes: The typical allergy skin test takes 15 min. To develop once applied to the skin. So you will have meaningful answers in 15 min.! however, plan on you ... Read More
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3 thanks
A 43-year-old female asked:
Dr. Ryan Phasouk
17 years experience Family Medicine
Can vary: Allergic reactions from taking antibiotics can be an immediate event or can take days to develop. When they take a longer period of time, we call the ... Read More
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A 45-year-old member asked:
Dr. Maureen Ziboh
25 years experience Family Medicine
It varies: It varies up usually by a couple of days to a week
A 37-year-old member asked:
Dr. David Shulan
40 years experience Allergy and Immunology
Depends: Immedite type reactions can occur i minutes. Contact allergies can take several days to show itself. Some drugs reactions can appears as long as 2 w ... Read More
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5 thanks
A 38-year-old member asked:
Dr. Robert Marvit
56 years experience Psychiatry
Depends on drug: From immediatly to weeks or months depending on drug the dose and route of administration.
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2 thanks
A 56-year-old member asked:
Dr. John Rhoades
47 years experience Family Medicine
Variable: Some patients will have the beginning of a reaction in minutes, others will be in hours. If prior exposures, and prior reactions, then it will be qui ... Read More
A 40-year-old member asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
Variable: The development of environmental allergies usually takes 2-3 pollen seasons. A medication allergy could occur on the first course or after taking the ... Read More
A 40-year-old member asked:
Dr. Glenn Messina
34 years experience Aesthetic Medicine
Several days: Expect to have the rash from 1 to 3 weeks or some remnant of it.
A 47-year-old member asked:
Dr. Donald Shenenberger
24 years experience Dermatology
Variable: All i can say is variable. Once someone has developed an allergy to something a reaction will take place fairly quickly after exposure. As long as y ... Read More
A 56-year-old member asked:
Dr. Stevan Cordas
56 years experience Internal Medicine
How long: Minutes to hours. Depends how bad it is and how allergic you are.
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5 thanks
A male asked:
Dr. Ajay Acharya
36 years experience Internal Medicine
Pretty quick..: It should be very quick........
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1 thank
A 40-year-old member asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
Depends: Hives or urticaria can occur within minutes on skin contact or ingestion of a food allergen, while contact dermatitis from poison ivy or nickel may ta ... Read More
A 26-year-old female asked:
Dr. Doanh Nguyen, md, faaaai
13 years experience Allergy and Immunology
Within a week: Gluten sensitivity can present with a variety of symptoms. If you suspect that you might have gluten sensitivity, you should see changes in your sympt ... Read More
2
2 thanks
A 54-year-old member asked:
Dr. Theodore Davantzis
39 years experience Dentistry
No time frame: It is difficult to give you a specific time frame since the causes of shifting teeth vary with age, your bite, grinding, and periodontal problems, all ... Read More
A 52-year-old member asked:
Dr. David Rosenthal
20 years experience Allergy and Immunology
Varies: Typically within a few minutes and up to 30 min. It can take longer, but this is rare. Go to the emergency room if you suspect anaphylaxis, and use y ... Read More
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1 thank

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

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