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i am allergic to penicillin can I take cephalexin

A 51-year-old female asked:
Dr. David Edelman
38 years experience General Surgery
Probably should not: Cephalexin is related to penicillin and there is a chance of an allergic reaction. Many people who are allergic to penicillin can take Cephalexin saf ... Read More

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A 46-year-old member asked:
Dr. Doanh Nguyen, md, faaaai
13 years experience Allergy and Immunology
Yes: Cross reactivity between the two classes are low so Cephalexin is not contraindicated in penicillin allergy patients. You should have your prescribing ... Read More
A 28-year-old female asked:
Dr. Martin Raff
55 years experience Infectious Disease
Penicillin allergy: You have what is known as an immediate hypersensitivity reaction to penicillin derivatives and should never be given one, since this is life-threateni ... Read More
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A 46-year-old member asked:
Dr. Brant Ward
12 years experience Allergy and Immunology
Likely, not certain: The majority of people who are told they are allergic to penicillin are not actually so (they get rashes for other reasons, e.g.). Of those that are a ... Read More
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A 73-year-old male asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
Yes: Tetracycline and Amoxicillin are in completely different classes of antibiotics. There is no cross reactivity.
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A 56-year-old member asked:
Dr. Michael Zacharisen
32 years experience Allergy and Immunology
Yes: Fosfomycin is an antibiotic made originally from streptomycin and now all synthetic. It should not cross react with penicillin.
A 44-year-old member asked:
Dr. Debi Williams
25 years experience Dentistry
Not a good idea : There has been cross over allergy reactions between Ceclor and amoxicillin. Contact your doctor before taking this medication.
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A 40-year-old member asked:
Dr. Paul Carter
29 years experience Allergy and Immunology
Yes: Biaxin (clarithromycin) does not cross react with penicillins.
A 52-year-old member asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience Allergy and Immunology
Yes: They are not related.
A 30-year-old female asked:
Dr. Cornelius Oleary
18 years experience Urgent Care
Yes: Ciprofloxacin is part of the fluoroquinolone class of antibiotics and is different than cephalexin, which is a cephalosporin. As always, consult your ... Read More
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A 25-year-old female asked:
Dr. Martin Raff
55 years experience Infectious Disease
Piperacillin/tazobac: This compound contains a penicillin derivative and if you have a documented allergy to penicillin you should never ever take this drug.
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A 30-year-old female asked:
Dr. Jack Mutnick
16 years experience Allergy and Immunology
Most likely, Yes: They are completely different classes or families of antibiotics. There is no data to show any cross reactivity between Amoxicillin and tobramycin.
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A 40-year-old member asked:
Dr. James Chapman
40 years experience Cardiology
Yes: No problem with this med
A 51-year-old member asked:
Dr. Jeffrey Rumbyrt
31 years experience Allergy and Immunology
Yes: Tetracycline and Cipro (ciprofloxacin) are in different drug classes. Cipro (ciprofloxacin) is a quinolone agent and is unrelated to tetracycline. Y ... Read More
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A 35-year-old male asked:
Dr. Shaym Puppala
24 years experience Internal Medicine
Not same class: Someone allergic to amoxicillin (in penicillin class) is not considered at high risk for clindamycin allergy (not penicillin class). That does not gua ... Read More
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A 29-year-old female asked:
Dr. Tony Ho
Dr. Tony Ho answered
13 years experience Infectious Disease
Yes: Ciprofloxacin is a quinolone, and has no cross-reactivity with the others mentioned.
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A 32-year-old female asked:
Dr. Robert Killian
27 years experience General Practice
Penicillin Allergy: Nope. Not at all. You can take no 'cillins'. Amoxicillin is a penicillin.
A 52-year-old member asked:
Dr. David Rosenfeld
26 years experience Pain Management
Likely yes: I assume your doctor is aware of this before putting you on cefixime. Be vigilant for signs of allergic reaction. Stop & inform your doctor immediatel ... Read More
A 53-year-old female asked:
Dr. Martin Raff
55 years experience Infectious Disease
Yes: From the standpoint of cross-allergy there is none. Two questions. What is the allergic reaction to pcn? (are you truly allergic). And then, since ... Read More
A 38-year-old member asked:
Dr. Gary Steven
29 years experience Pediatric Allergy and Asthma
Unlikely: Amoxicillin is in the penicillin family; Keflex is a cephalosporin. Only about 10% of penicillin-allergic people react to cephalosporins, so it is gen ... Read More
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A 43-year-old member asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience Allergy and Immunology
Most of the time: I would say that it should be ok 95% of the time.
A 48-year-old member asked:
Dr. Gary Sandler
53 years experience Dentistry
For what?: Ampicillin is part of the penicillin class of antibiotics. While Erythromycin is usually considered an alternative antibiotic with individuals who ar ... Read More
A 41-year-old member asked:
Dr. Steven Tucker
26 years experience Internal Medicine
Maybe but avoid: Most people do not have true allergies to medicines. Some are better described as an intolerance. Antibiotics are important in life, so i would a. ... Read More
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A 56-year-old member asked:
Dr. Lee Perry
Dr. Lee Perry answered
16 years experience Allergy and Immunology
Depends on infection: It really depends on what type of infection you need to treat. It is likely safe to treat with a 3rd generation cephalosporin (cefdinir), or another c ... Read More
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