Had a reaction to a penicilin based medication which was a strong version of the penicillin, now have been told to take Keflex, Dr knows my situation. If not advisable to take what would be good for upper respiratory infection I have had for 5 days, not on the chest.
Is it safe to take Keflex when allergic to penicillin?
Question posted by lozzer45 on 3 July 2013
Last updated on 24 June 2018
3 Answers
flamingonut
18 Nov 2017
I am allergic to penicillin, due to over prescribing for a dental infection. Years later, was given Keflex for a bad finger infection by an emergimed place. Followed up with my doctor and she told me to stay on it since I hadn't experienced any allergic reactions after 2 days of taking Keflex. On day #7, I got an large unexplained welt on my face, so I stopped with just a few more that were supposed to be taken. Googling that brought me to the conclusion that I did have an allergic reaction to the Keflex. Luckily its a minor allergy, but just another antibiotic I have issues with.
kaismama
3 July 2013
I am allergic to penicillin, and I can take keflex, so you see its not a definite thing you'll be allergic to it.
traumanurse
3 July 2013
Keflex is in a class called cephalosporin. While cross allergies happen there is a 5-10% chance you will also be allergic to it. Your Dr felt this was the antibiotic needed for your condition. Take it as directed and notify your Dr immediately if you have itching, swelling or rash. Good luck
loveseth69
24 June 2018
I was allergic to penicillin so I took Keflex for about a week and then had worst attack I've ever had benadryl usually helps this time by the time I got to hospital barely breathing and swelled in rashes head to toe it was my worst attack yet.
Related topics
keflex, penicillin, upper respiratory tract infection, medication
Further information
- Keflex uses and safety info
- Keflex prescribing info & package insert (for Health Professionals)
- Side effects of Keflex (detailed)
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