What are the most common side effects of iohexol?
The most common side effects of iohexol are listed below. These side effects may vary depending on how and where iohexol is given to you. Tell your health care provider if you have any of these side effects that bother you.
- Headache
- Pain in your back or neck
- Stiffness
- Nausea and vomiting
- Dizziness
- Vision changes, such as blurry vision
- Bad or unusual taste in your mouth
- Heart effects (see below)
- Warm sensation
- Diarrhea, stomach pain, or gas
There may be other side effects of iohexol that are not listed here. Contact your health care provider if you think you are having a side effect of a medicine. In the U.S., you can report side effects to the FDA at www.fda.gov/medwatch or by calling 800-FDA-1088 (800-332-1088). In Canada, you can report side effects to Health Canada at www.health.gc.ca/medeffect or by calling 866-234-2345.
What are the serious side effects of iohexol?
While less common, the most serious side effects of iohexol are described below, along with what to do if they happen. These side effects may vary depending on how and where iohexol is administered.
Severe Allergic Reactions. Iohexol may cause allergic reactions, which can be serious. Get help right away if you have any of the following symptoms of a serious allergic reaction.
- Breathing problems or wheezing
- Racing heart
- Fever or general ill feeling
- Swollen lymph nodes
- Swelling of the face, lips, mouth, tongue, or throat
- Trouble swallowing or throat tightness
- Itching, skin rash, or pale red bumps on the skin called hives
- Nausea or vomiting
- Dizziness, feeling lightheaded, or fainting
- Stomach cramps
- Joint pain
Heart Effects. Iohexol may have certain effects on the heart, such as lowering your blood pressure or causing an abnormal heart rhythm (arrhythmia). Tell your health care provider away if you have chest pain, dizziness, or a fast or irregular heartbeat, or if you feel your heartbeat more than usual.
Kidney Damage. Iohexol can cause kidney damage. The risk may be higher if you are dehydrated. Tell your health care provider right away if you have any of the following symptoms of kidney damage.
- Reduced need to pee
- Swelling in your feet, ankles, or legs
- Weakness or unusual tiredness
- Difficulty catching your breath or chest pain/pressure
- Confusion
- Nausea
- Seizures
Blood Clots. Iohexol may cause blood clots in your arteries or veins and could cause a stroke, heart attack, or venous thromboembolism. Get emergency help if you have any of the following signs of blood clots.
- Chest pain or pressure
- Fast or abnormal heartbeat
- Trouble breathing
- Pain in your back, jaw, throat, or arm
- Sweating, upset stomach, vomiting, or dizziness
- Sudden weakness on one side of your body
- Sudden and severe headache
- Slurred speech or trouble understanding speech
- Pain, swelling, or tenderness in your arm or leg
- Vision loss
Severe Skin Reactions. Iohexol can cause severe skin reactions, such as Stevens-Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN), that can lead to death if not treated. These can happen up to several weeks after receiving iohexol by injection. If you get a rash, tell your health care provider right away. Get emergency help if you have any of the following symptoms of SJS or TEN.
- Painful red or purple skin that looks burned and peels off
- Flat red rash or blisters on your skin, mouth, nose, and genitals
- Red, painful, watery eyes
- Flu-like symptoms including fever, chills, and muscle aches
Injection Site Reactions. Injection site reactions can happen when iohexol is injected into a blood vessel. Symptoms may include pain, itching, swelling, or redness near the injection site. In rare cases, fluid can leak out of the blood vessel and could damage nearby tissues. Tell your health care provider right away if you have pain, swelling, warmth, or skin color changes where the medicine is being or was given.
Seizures. Seizures can happen when iohexol is injected into or near the spine. There are many different types of seizures and some of them are not easy to recognize. Tell your health care provider if you have any of the following signs that a seizure is happening or could happen.
- Muscle twitching, jerking, spasms, tremors, or other uncontrolled movements
- Stiffening of your arms and legs
- Feeling anxious, nervous, confused, or a sense of dread
- Feeling dizzy or lightheaded
- Falling or losing consciousness
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