U.S. doctors online nowAsk doctors free
A 34-year-old member asked:

i am having an allergic reaction 2 days after having a ct scan done. is this common and how should i treat it? itchy red whelps all over me.

3 doctor answers10 doctors weighed in
Dr. Brandon Riesenmy
Psychiatry 34 years experience
Notify your doctor: Notify your doctor as soon as possible about your reaction. You likely have a reaction to the contrast agent used for the ct scan. Antihistamines may alleviate the itching. Some allergic reactions can progress and be quite severe. A life threatening condition called stevens-johnson syndrome can be a consequence of some drug allergies. Allergic reactions are relatively uncommon but may be serious.
Dr. Eric Wang
A Verified Doctor commented
A US doctor answered Learn more
As in all personal medical questions and conditions, you should at minimum call the facility which performed the CT and ask to speak to the physician. If (s)he is unavailable, you should speak to your primary care doctor and/or seek a professional opinion from an urgent care center or Emergency Room
Feb 12, 2012
Dr. Michael Jones
A Verified Doctoranswered
A US doctor answeredLearn more
Benedryl: Is a good place to start but if you're having shortness of breath, tongue swelling or difficulty swallowing please go to the er or call 911.
Dr. Tushar Patel
Radiology 26 years experience
Contrast reaction: Make sure to let your doctors know you had this delayed reaction to intravenous contrast. Next time you are scheduled for a ct scan, angiogram, or any xray test requiring intravenous contrast, you should be premedicated with benedryl and Prednisone pills 24 hours prior to the contrast injection to lessen the risk of a more severe allergic reaction (i.e. Wheezing, throat swelling, anaphylaxis).

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Personalized answers
Talk to a doctor
$30 per visit with

Similar questions

A member asked:

How many times per day should my baby eat, and how should I deal with any feeding problems?

4 doctor answers10 doctors weighed in
Dr. Laura Webb
Pediatrics 13 years experience
When they are hungry: As infants you should feed your baby whenever they are hungry. Generally this is every 2-3 hours. As they get bigger they will eat more with each feeding and the time between will lengthen. But even 3 and 4 mo babies will eat every 3 hours or so during the day. Count number of wet diapers if there are not 6-8 daily see your dr. If you are concerned about any feeding problems see your dr.
Tallahassee, FL
A 22-year-old female asked:

I had spotting on the day I was suppose to start my period which was the 27th of july and it ended the 30th I had spotting for those three days. Then I tested 2 days later and I got a negative........If im pregnant could I have tested too early its been

1 doctor answer1 doctor weighed in
Dr. Andrew Silverman
Fertility Medicine 49 years experience
Repeat the test: Sometimes it takes up to a weeks for the urine test to turn +. If you feel pregnant and continue to have a negative urine test i suggest that you have the more definitive blood test.
Dayton, OH
A 24-year-old female asked:

I'm not on any type of birth control. My period is 16 days late I took a pregnancy test today it came back negative. What could be going on.?

2 doctor answers4 doctors weighed in
Dr. Alan Patterson
Obstetrics and Gynecology 42 years experience
Do a blood PT: You need a blood bhcg, if neg could be form other hormones being not right or other pronblems, your gyn can figure out what is going on when you see your gyn or a gyn, they will do an exam, blood work and ultrasound.
A 28-year-old member asked:

I had a headcold that got worse in 2 days, im now vomiting, diahreoa, dizzy, and ache all over what could it be?

1 doctor answer2 doctors weighed in
Dr. William Goldie
Pediatric Neurology 48 years experience
The flu?: The symptoms indicate your body is fighting off some nasty infection. Serious and treatable infections need to be excluded. If none found, most likely it is viral flu.
Tampa, FL
A 26-year-old female asked:

My son which is 2 years old and I have had diahhrea for 6 days and vomitting only off and on usually when we eat we also have runny noses and no fever?

1 doctor answer5 doctors weighed in
Dr. Jeffrey Pollard
ENT and Head and Neck Surgery 21 years experience
Sounds like virus: Sounds like a viral "enteritis" - basically a "stomach flu". Viral gastrointestinal infections can not only be tedious to get through, they can also be quite serious in a small child. With symptoms of that duration in a 2 y/o you may need to get reassurance from a pediatrician or urgent care doctor that he/she is staying hydrated enough (as 2 y/o's don't have much reserve). Hope this helps!

90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more. Get help now:

Ask doctors free
Personalized answers
Talk to a doctor
$30 per visit with
Last updated Sep 17, 2017
Connect with a U.S. board-certified doctor by text or video anytime, anywhere.
$30 per visit with


Content on HealthTap (including answers) should not be used for medical advice, diagnosis, or treatment, and interactions on HealthTap do not create a doctor-patient relationship. Never disregard or delay professional medical advice in person because of anything on HealthTap. Call your doctor or 911 if you think you may have a medical emergency.