i m allergic to penicillin can i take cephalexin 500mg

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I have a severe allergy to Shell Fish. My doc just prescribed Keflex, because I am allergic to Penicillin, too. I took a Benadryl, ?

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Adrenaline
Being allergic to shellfish and being allergic to antibiotics are two different things. They are not related. However, as the other doctor indicated, patients that are allergic to penicillin should not (in general) take Keflex. Your shellfish allergy needs to be taken seriously and not only should you strictly avoid shellfish, you should carry injectable epinephrine in case you have exposure.
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Dr. Ronald Krauser answered:

I am allergic to penicillin is it safe to take cephalexin for infection in the urine.

Yes

Penicillin
Unless you had an anaphylactic reaction to penicillin (major breathing problems) there is little risk to trying cephalexin.
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Dr. Alex Martinez answered:

I'm allergic to penicillin, can I take keflex?

Maybe

Fever
Penicillins (like Amoxil) & cephalosporins (like Keflex) are both beta-lactam antibiotics named because of their ringed chemical structure. Allergy to penicillins is sometimes directed against this ring, and an allergic reaction may also occur if a similar antibiotic is taken. It is estimated that about 10% of penicillin-allergic patients are also allergic to cephalosporins like Keflex.
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Dr. Brant R. Ward answered:

Allergic to penicillin can I take keflex?

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 allergic, about 70% or more will lose the allergy after about 10 years. If you are still allergic, there is about a 10% chance of cross-reaction to 1st-gen cephalosporins like keflex. An allergist can perform testing to judge your risk for a reaction.
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I m allergic to penicillin keflex azithromiacin My daughter has Scarlet fever and I m worried about what I can take if I get it ?

Don't panic

Scarlet_fever
Scarlet fever is an acute febrile illness, primarily affecting children, caused by group A beta-hemolytic streptococci. Clinical manifestations include fever, sore throat, and fine sand-paper like rash caused by a toxin produced by the strep. Although penicillins are antibiotics of choice, there are other antibiotics that are effective. Your doctor will know. A throat culture is helpful.
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What to do if I have strept throat, and im allergic to penicillin, can take amoxicillin or keflex instead?

No

Amoxicillin
Amoxicillin is within penicillin class and the risk of having a reaction is significant so it should be avoided. There is controversy about the risk of cross reaction between class of antibiotics Penicillin and cephalosporin (Keflex). It appears the risk is low (but not 0). If penicillin allergy was years ago, skin testing for penicillin can help know if it is still there. Allergist can help.
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Dr. Paul M. Carter answered:

If i'm allergic to penicillin is it safe to take keflex pulvales?

No

If you are truly allergic to penicillin, you should avoid all penicillin derivatives and the first generation cephalosporins. Keflex is a first gen. cephalosporin and may cross react with penicillin. See a board certified allergist to help you determine if penicillin is a true allergy for you.
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Is it a bad idea for someone allergic to penicillin safely take keflex, a cephalosporin?

Yes

cephalexin (Keflex) is a first generation cephalosporin and a very close cousin to penicillin. Though it is not 100% true that all penicillin allergic individuals are also allergic to cephalexin, there is a high likelihood of that happening.
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Dr. John T. Chiu answered:

I'm allergic to penicillin. Was prescribed cephalexin for folliculitis. Stop taking it 3 days ago. Now I have hives all over. Delayed reaction?

Possible

Penicillin
A small % of people who are allergic to penicillin may also react to cephalosporin such as cephalexin. However, if your reaction did not occur until about 10 days after you started to take the medication, this may well be a true allergic reaction specific to cephalexin.
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Dr. John T. Chiu answered:

Tried trimethoprim, nitrofurantoin and cephalexin for UTI. Nothing has worked so far. I'm allergic to augmentin and penicillin- what else can I try?

Infectious dis doc

Amoxicillin
First the problem may be from inflammation and not infection. 2nd the organ may not be sensitive to these antibiiotics 3rd there may be obstruction or a stone somewhere along the urinary tract. You need to see an infectiious disease and/or urology specialist.
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