Yes, Activated charcoal is a very good and effective binder - just watch out for constipation as that will hinder your ability to detox. Drink plenty of water!!!
I did find this as well:
www.radiologyinfo.org/en/info.cfm?pg=safety-contrast Side effects for Iodine-based Contrast Materials
Mild reactions include:
nausea and vomiting
headache
itching
flushing
mild skin rash or hives
Moderate reactions include:
severe skin rash or hives
wheezing
abnormal heart rhythms
high or low blood pressure
shortness of breath or difficulty breathing
Severe reactions include:
difficulty breathing
cardiac arrest
swelling of the throat or other parts of the body
convulsions
profound low blood pressure