Some patients with allergies or sensitive stomachs may choose to discuss alternatives to the<unk>  with their radiologist, but most patients find the common side effects more of an annoyance than a serious problem. Among the possible side effects, listed on MedlinePlus are nausea and diarrhea, which may begin as soon as 15 minutes after consumption begins and may persist through the day after the test is completed. Other side effects may include a feeling of weakness, pale skin, ringing in the ears, constipation, and vomiting. Patients may be strongly encouraged to avoid vomiting, as expelling a substantial quantity of the<unk>  may void its effect on the CT scan and produce unusable results, requiring a retest. As with most medications, if any severe side effects are experienced the patient is encouraged to contact their doctor or local poison control center immediately.
Barium sulfate suspension
Sodium hydroxide
Amylmetacresol
Sodium hypochlorite
Podophyllum resin
Hydrochloric acid
Silver diammine fluoride
Iron sucrose