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Iohexol is used as contrast enhancement medium used in diagnostic procedures such as computed tomography (CT) scans and X-ray imaging to improve the visibility of different organs in the body and thus helps in the diagnosis of any medical condition in different body regions.

How it works

Iohexol belongs to a class of drugs known as radiographic contrast agents. It enhances imaging due to its high Iodine content attenuating the beam of X-rays during examination. 

Common side effects

Dizziness, Skin redness, Flushing, Headache, Itching, Maculopapular rash, Nausea, Running nose, Sneezing, Urticaria, Vomiting


Expert advice

• Keep yourself well hydrated before consumption of any contrast media to prevent any kidney damage.
• Inform your doctor if you are diabetic or if you have cancer, pheochromocytoma (adrenal gland tumor), blood disorder (Sickle cell anemia) or thyroid disorder or if you have a history of fits (epilepsy), heart diseases, multiple sclerosis or alcoholism.
• Seek immediate medical attention if you experience chest pain spreading to other parts of body, headache, and numbness after receiving iohexol. 
• Tell your doctor if you are pregnant, planning to become pregnant or are breastfeeding.
• Patients allergic to Iohexol or any of its ingredients and any other iodinated contrast media should avoid taking it.
• Patient with any local or systemic infection which may cause infection in blood (bacteremia) or receiving other medicine such as corticosteroids in case the contrast media has to be administered intrathecal (within the layers of spinal cord) should avoid taking Iohexol.

Frequently asked questions


Q. How does Iohexol work?
Iohexol contains iodine and works by enhancing contrasts to body parts and fluids. Iohexol improves the images obtained during a CT scan for easily diagnose your condition. 
Q. Is Iohexol radioactive?
No, it is not radioactive. 
Q. Is Iohexol water soluble? 
Yes. Iohexol is a water soluble iodinated contrast medium.

Content on this page was last updated on 30 September, 2016, by Dr. Varun Gupta (MD Pharmacology)