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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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What Causes Outbreak Of Hives With Vomiting And Abdomen Pain?

Hi. I have a six year old son who is having a severe reaction to omnicef. I told the doctor he was allergic to penicillian, and she put him on this medication over a week ago. 24 hours after the last dose, he suddenly broke out in hives. I took him to his doctor and she gave him prednizone and told me to keep him dosed with benedryl, and claritin. I have also given him several collidal oatmeal baths and kept him covered with calamine lotion. His hives are getting so much worse, they look like large donuts with white ridges and deep purple centers. The hives range from dime size to five inches across. He suddenly started complaining of stomach pain and began vomiting about thirty minutes ago. Should I take him into urgent care, or is this typical? He is not running a fever, and was drinking only water since dinner last night. His stomach is hurting, and he is very lethargic, more-so than I expect from benedryl. He is responsive, just out of it. What should I do?
Fri, 13 Mar 2015
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Allergist and Immunologist,  's  Response
Hello,

Thank you for asking at HCM.

I went through your son's history and would like to make suggestions for him as follows:

1. It is possible to develop allergic reaction to antibiotics like penicillins, cephalosporins, or, scientifically, any drug. Unfortunately, it is usually very difficult who will develop allergic reaction to which drug.

In case of your son, I think, it is possible that your son has developed reaction to omnicef.

2. I would agree with treatment so far, steroid (Prednizone), antihistamine (Benadryl & Claritin) & local treatments like calamine lotion-oatmeal baths. I would like to make clear that benadryl is not only to keep him dosed, it is also a treatment of hives.

3. As he is very lethargic, I would suggest you to take him into urgent care, as lethargy that is more than sedation could not be taken lightly. There are many possible causes of lethargy, from simply combined sedation of all antihistamines to more serious causes like dehydraion, etc.

So it is important that he is examined by a doctor and then receive further treatment.

So for my such patient, I would suggest to take him into urgent care to get examined by a doctor.

Hope above suggestions will be helpful to you.

Should you have any further query, please feel free to ask at HCM.

Wish your son the best of the health ahead.

Thank you & Regards.
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What Causes Outbreak Of Hives With Vomiting And Abdomen Pain?

Hello, Thank you for asking at HCM. I went through your son s history and would like to make suggestions for him as follows: 1. It is possible to develop allergic reaction to antibiotics like penicillins, cephalosporins, or, scientifically, any drug. Unfortunately, it is usually very difficult who will develop allergic reaction to which drug. In case of your son, I think, it is possible that your son has developed reaction to omnicef. 2. I would agree with treatment so far, steroid (Prednizone), antihistamine (Benadryl & Claritin) & local treatments like calamine lotion-oatmeal baths. I would like to make clear that benadryl is not only to keep him dosed, it is also a treatment of hives. 3. As he is very lethargic, I would suggest you to take him into urgent care, as lethargy that is more than sedation could not be taken lightly. There are many possible causes of lethargy, from simply combined sedation of all antihistamines to more serious causes like dehydraion, etc. So it is important that he is examined by a doctor and then receive further treatment. So for my such patient, I would suggest to take him into urgent care to get examined by a doctor. Hope above suggestions will be helpful to you. Should you have any further query, please feel free to ask at HCM. Wish your son the best of the health ahead. Thank you & Regards.