Doctor insights on:
I'm Allergic To Penicillin Can I Take Cephalexin 500mg
Can I take cephalexin if I am highly allergic to penicillin? I have not taken penicillin since I was very young. Reaction of hives convulsions
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-threatening. There is said to be cross-hypersensitivity reactions to cephalosporins in 5% of pen allergic persons, and 0.1% of these have a severe reaction. My advice would be not to take a cephalosporin antibiotic unless there was no alternative. ...Read more
Maybe: 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. ...Read more
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. ...Read more
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. ...Read more
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 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. ...Read more
I started taking cephalexin. As I have had mild allergic reaction to penicillin, should I expect serious allergic reactions to this medicatiion?
Mostly not: The incidence of cephalexin allergy in patients with penicillin allergy is in the single digit % and likely not much different from patient without a history of penicillin allergy. However if you had a severe anaphylactic reaction to penicillin, I would suggest an allergy consult just to be safe. ...Read more
There is indeed crossreactivity, but:
-if you are allergic to cephalosporins like cephalexin, and have had penicillin with no problem in the past, most patients can continue taking penicillin without problems.
-if you have not had penicillin since this reaction to cephalexin, you should see a physician who could to test you to penicillin, ideally an allergist. ...Read more
I'm allergic 2 penicillin/prescribed cephalexin 4 a cellulitis infection in my arm from a iv. How fast would a serious reaction occur if allergic?
Minutes to hours: A small proportion of penicillin allergic patients can have an allergic reaction to cephalexin. Drug allergic reactions can occur in minutes to hours if already sensitized. It is possible to develop serious allergic reactions after several days of being on the medication and in some cases even shortly after stopping the med. Allergy testing is available for penicillin but not cephalexin. ...Read more
I'm 18 years old and weigh 250 lbs. I am allergic to penicillin but have strep throat. What is the correct dose of cephalexin to be taken?
I have a whitehead abcess beside a broken tooth. When I was a child I broke out from penicillin. And I don't know if I can take cephalexin. Can I?
Abscess/Cephalexin: This sounds like a dental abscess. Use warm compresses frequently to encourage it to drain. Allergy to Penicillin is often over diagnosed so at some point look into it further. Cephalexin is not considered a good alternative if you have a Penicillin allergy. A medication called Clindamycin would be a better choice. Be sure to see your dentist to manage your abscess and your broken tooth. ...Read more
ER doctor prescribed me Keflex for possible mastitis and UTI knowing I'm allergic to penicillin. I am on day 3 and have an itchy rash on arms and legs?
Possibly allergic: Cephalexin (Keflex) and related antibiotics (the cephalosporin group) are chemically similar to penicillinl. Although penicillin allergic persons usually can take them without problem, occasional cross reactions occur -- i.e. you may be allergic to the cephalexin. Check with the doctor who prescribed it. ...Read more
Neosporin: People have a tendency to assume that neosporin does not cause side effects because it is a widely available and frequently used nonprescription product. However, this is simply not the case. In fact, many healthcare providers now recommend that people avoid products with neomycin (including neosporin), as neomycin is more likely than most other antibiotics to cause allergic reactions. ...Read more
Always fine w penicillin, but had extreme allergic reaction reaction to keflex! Does that mean I am now also allergic to penicillin for sure?
Was recently dx'd with lupus & am allergic to Keflex. Heard that lupus patients tend to have strong reactions to penicillin, should I avoid penicilin?
Avoid penicillin: I am not aware of the connection between allergy to PCN and lupus, You need to avoid PCN if you are allergic to keflex. ...Read more
I got allergy from penicillin 45 yrs ago when I was 8 yrs, since then I have not used it. Now due to UTI I am given keflex. Shd I take it. Advice plz?
Usually okay.: We were taught for years that there is about a 10% risk of being allergic to cephalosporins (like Keflex) in people who were allergic to drugs in the penicillin family. Later research has said that is a myth, and there is less than a 1% risk depending on the type of cephalosporin. See http://www. Ncbi. Nlm. Nih. Gov/pubmed/21742459. Talk to your doctor about your fears, though. ...Read more
I'm allergic to sulfa and penicillin my boyfriend is taking keflex will I have a reaction if we have sex?
Not at all.: Have fun!Get a more detailed answer ›
I took Keflex and had hives all over my body, was told not to use Penicillin or Sporin dugs. Hives again from Neosporin, Can I take the Shingles Shot?
I read that the flu shot is made from antibiotics. Safe for people allergic to keflex and penicillin?
Is erythromycin ointment safe for someone who is allergic to keflex/penicillin? Also, if using for eye infection/stye, do I apply it inside my eye?
Yes and probably: Erythromycin is a macrolide antibiotic. It is not related to the penecillins nor cephalosporins to which you had allergies. There should be no cross reactivity. The standard treatment for stye is heat and compression (squeezing) then surgical incision and drainage if initial therapy is unsuccessful. If a patient has an eye infection with discharge, the antibiotic ointment goes inside the eyelid. ...Read more
I went to the emergency room a week ago I have cellulitis the doc gave me a shot of penicillin and cephalexin 500 mg for ten days I also been fighting a meth addiction I don't use needles I smoke it can this stop me from getting better I feel worse?
It certainly could: Compromise your recovery and potentially lead to more serious conditions and eventual death. Check into a rehab facility and get off the illicit drugs. ...Read more
Can cefalexin cause any heart problems as a side effect, I'm allergic to penicillin is this safe for me to take, taking for chest infection 1g a day?
Penicillin allergy: Cephalexin can cause any type of drug allergy symptoms like anaphylaxis, angioedema, steven johnson syndrome, bone marrow suppression, hepatitis but heart problems do not seem to be listed as an side effect. About 90% of patient with reported penicillin allergy during childhood can tolerate penicillin. If there is a true penicillin allergy, there is a 2% risk of having Cephalexin allergy. ...Read more
My doc gave me keflex to take prior to an upcoming procedure but im alergic to penecilian (sp). Should I be concerned about a possible reaction?
Keflex: Keflex is a cephalosporin antibiotic and is not normally prescribed for dental infections. Since an antibiotic will not resolve your dental issues, your best bet is to see a local dentist and have the tooth evaluated. ...Read more
If you are allergic to peniclin, could you also be allergic to cephalexin. Reason being I took it last night and when I woke up my lip was swollowing?
Yes: There is a significant percentage of penicillin allergic patients who have a cross sensativity to cephalosporin antibiotics. In all likelihood you are allergic to Cephalexin as well as penicillin if you are experiencing swollen lips. Please contact your health care professional and you may need anti-histamine treatment. Stop the medication until prescriber is consulted. ...Read more
22 weeks pregnant and on cefalexin 1mg 3times a day for last 5 days for upper uti infection. Allergies to penicillin and septrin. Symptoms worsening.
? resistance: It is possible that you have a bacteria which is resistance to the cefalexin. Since you are pregnant and you have "upper tract" infection, it could become a significant problem. See your doctor soon. The urine can be tested to see to which antibiotics the bacteria is sensitive. ...Read more
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- I am allergic to penicillin can i take cephalexin