Have you ever been told by your doctor that you need to have an abdominal X-ray or CT scan? In such a case, you may have been given a special liquid to drink before the test. One such liquid is Iohexol, which we are talking about today. Although many people do not know the name of this, it is very important to know what it is, what it is used for, and what we need to be careful about when using it.
What is Iohexol?
Simply put, Iohexol is a special "coloring liquid." But it is not colored. Doctors call it a 'contrast agent' . When you drink this liquid, when you take an X-ray or a CT scan (Computed Tomography scan), the organs inside your stomach, such as the digestive system, such as the stomach and intestines, become very clearly visible. It is like a white chalk stick drawn on a blackboard. Because of this, the doctor can easily find out if there is any problem, tumor, or lesion in those organs. Omnipaque is also a famous brand name for this medicine.
Things you should tell your doctor before taking this medicine
Before you have this test, it's important to discuss certain things with your medical team. In particular, let your doctor know if you have any of the following conditions:
- If you have a breathing disease like asthma.
- If you have allergies to Iohexol, iodine , other medications, foods, dyes, or some preservatives.
- If you are pregnant, or are hoping to become pregnant soon.
- If you are a nursing mother.
It is very important to discuss these matters with your doctor, because then he or she can plan the test in the most appropriate and safest way for you.
How do I use this? And what do I do in an emergency?
This medicine is not something you can take home. It is given only in a hospital or clinic , under the supervision of a health care professional. You will be given it to drink shortly before the test.
Special care should be taken when giving this medicine to young children. Therefore, if giving this to a child, it is essential to talk to a pediatrician about it and take the necessary precautions.
What if I take too much medicine? (Overdosage)
This is unlikely to happen as it is given in a hospital setting. However, if you suspect that you have taken too much of this medicine, immediately contact the National Poisons Information Centre at the Colombo National Hospital or go to the nearest hospital Emergency Treatment Unit (ETU) .
Other drugs that may interact with Iohexol (Drug Interactions)
Some medications you are taking may interact with Iohexol. Therefore, tell your doctor about all the medications you are taking, including prescription medications, over-the-counter medications, herbs, and vitamins. Don't forget to tell your doctor if you smoke or drink alcohol.
It is especially important to be aware of the following medications:
- Some medications for heart disease and high blood pressure - for example, beta-blockers such as metoprolol and propranolol.
- Some medications given for conditions like depression and anxiety.
- Medications in the class of drugs called MAOIs (e.g. Carbex, Eldepryl, Marplan).
- Metformin for diabetes.
- Phenothiazines (e.g. chlorpromazine, prochlorperazine, thioridazine).
- Radioactive iodine treatment for the thyroid gland.
This list does not include all medications, so for your safety, it is best to tell your doctor about everything you are taking.
What are the things to be careful about after taking this medicine?
Your medical team will monitor you closely after taking this medicine. However, sometimes, serious skin reactions can occur even weeks after taking the medicine . This is very important to remember.
If you have a fever and cold-like symptoms, but also develop a rash, see a doctor immediately. These rashes may turn red or purple, then blister and start to peel. Or, if you have red rashes, such as swelling of the face, lips, or swollen lymph nodes in the neck or armpits, don't ignore them.
Possible side effects
Like any medicine, Iohexol can cause some side effects. Some are serious, some are common. Let's take a look at them.
| Type of side effect | Description |
|---|---|
| ⚠️ Things to report to your doctor immediately | |
| Allergic reactions | Skin rash, itching, hives, swelling of the face, lips or tongue. |
| Serious skin reactions | Skin rash with fever and swollen lymph nodes; redness, blistering, peeling skin (even inside the mouth). |
| 🩺 Things to inform the doctor if they persist or are bothersome | |
| Digestive system problems | Diarrhea, nausea, vomiting, stomach cramps. |
| Other | Headache. |
This list does not include all possible side effects. If you experience any other, unusual symptoms, please inform your doctor.
Take-Home Message
- Iohexol is a special liquid (contrast agent) that helps make X-ray or CT scan tests clearer.
- Before using this, be sure to tell your doctor about your allergies (especially to iodine), other medications you are taking, and whether you are pregnant/breastfeeding.
- Serious skin reactions (fever-like rashes, blisters, peeling skin) can occur even weeks after taking the medicine. If you notice any of these, seek medical advice immediately.
- This medicine is only given in a hospital or clinic. If you have any questions about this, don't hesitate to ask your doctor.
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