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Toxic hepatitisBy Mayo Clinic staff
Original Article: http://www.mayoclinic.com/health/toxic-hepatitis/DS00811
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Toxic hepatitis is an inflammation of your liver in reaction to certain substances to which you're exposed. Toxic hepatitis can be caused by alcohol, chemicals, drugs or supplements.
In some cases, toxic hepatitis develops within hours or days of exposure to a toxin. In other cases, it may take months of regular use before signs and symptoms of toxic hepatitis appear.
The symptoms of toxic hepatitis often go away when exposure to the toxin stops. But toxic hepatitis can permanently damage your liver, leading to irreversible scarring of liver tissue (cirrhosis) and in some cases to liver failure.
Mild forms of toxic hepatitis may not cause any symptoms and may be detected only by blood tests. When signs and symptoms of toxic hepatitis occur, they may include:
- Yellowing of the skin and whites of the eyes (jaundice)
- Abdominal pain in the upper right portion of the abdomen
- Loss of appetite
- Nausea and vomiting
- Weight loss
- Dark or tea-colored urine
When to see a doctor
See your doctor right away if you have any signs or symptoms that worry you.
Get immediate medical care if you think your child has taken an overdose of acetaminophen (Tylenol, others) or your child develops signs or symptoms of a possible acetaminophen overdose, such as:
- Nausea and vomiting
- Upper abdominal pain
If you suspect an acetaminophen overdose, call 911, your local emergency services or the poison control center at 800-222-1222 immediately. An acetaminophen overdose can be fatal.
Toxic hepatitis occurs when your liver develops inflammation because of exposure to a toxic substance. Toxic hepatitis may also develop when you take too much of a prescription or over-the-counter medication.
Your liver performs hundreds of vital functions, including removing most drugs and chemicals from your bloodstream, and breaking them down so that they can be quickly eliminated from your body. Breaking down toxins creates byproducts that can be highly damaging to the liver. Although the liver has a great capacity for regeneration, constant exposure to toxic substances can cause serious — and sometimes irreversible — harm.
Toxic hepatitis can be caused by:
- Alcohol. Heavy drinking over many years can lead to alcoholic hepatitis - inflammation in the liver due to alcohol.
- Over-the-counter pain relievers. Nonprescription pain relievers such as acetaminophen (Tylenol, others), aspirin, ibuprofen (Advil, Motrin, others) and naproxen (Aleve) can damage your liver, especially if taken frequently or combined with alcohol.
- Prescription medications. Medications linked to serious liver injury include halothane, isoniazid, valproic acid (Depakene), phenytoin (Dilantin, Phenytek), azathioprine (Azasan, Imuran), niacin (Niaspan), atorvastatin (Lipitor), lovastatin (Mevacor), pravastatin (Pravachol), simvastatin (Zocor), fluvastatin (Lescol), rosuvastatin (Crestor), ketoconazole, certain antibiotics, certain antivirals and anabolic steroids.
- Herbs and supplements. Herbs considered dangerous to the liver include cascara, chaparral, comfrey, kava and ephedra. Children can develop liver damage if they mistake vitamin supplements for candy and take large doses.
- Industrial chemicals. Chemicals you may be exposed to on the job can cause liver injury. Common chemicals that can cause liver damage include the dry cleaning solvent carbon tetrachloride, a substance used to make plastics called vinyl chloride, the herbicide paraquat and a group of industrial chemicals called polychlorinated biphenyls.
Factors that may increase the risk of toxic hepatitis include:
- Taking over-the-counter pain relievers or certain prescription drugs. Taking a medication or over-the-counter pain reliever that carries a risk of liver damage increases your risk of toxic hepatitis. This is especially true if you take multiple medications or take more than the recommended dose of medication.
- Having a liver disease. Having a serious liver disorder such as cirrhosis or fatty liver disease makes you much more susceptible to the effects of toxins.
- Having hepatitis. Having viral hepatitis caused by the hepatitis B or C viruses makes your liver more vulnerable.
- Aging. As you age, your liver breaks down harmful substances more slowly. This means that toxins and their byproducts stay in your body longer.
- Drinking alcohol. Drinking alcohol while taking medications increases the toxic effects of most drugs.
- Being female. Because women seem to metabolize certain toxins more slowly than men do, their livers are exposed to higher blood concentrations of harmful substances for longer periods of time. This increases the risk of toxic hepatitis.
- Having certain gene defects. Inheriting certain genetic defects that affect the production and action of liver enzymes that break down toxins may make you more susceptible to toxic hepatitis.
- Working with industrial toxins. Working with certain industrial chemicals puts you at risk of toxic hepatitis.
The inflammation associated with toxic hepatitis can lead to liver damage and scarring. Over time, this scarring, called cirrhosis, makes it difficult for your liver to do its job. Eventually cirrhosis leads to liver failure. The only treatment for chronic liver failure is to replace your liver with a healthy one from a donor.
Preparing for your appointment
Make an appointment with your family doctor or a general practitioner if you have any signs or symptoms that worry you. If you're thought to have a liver problem, such as toxic hepatitis, you'll likely be referred to a liver specialist (hepatologist).
Because appointments can be brief, and because there's often a lot of ground to cover, it's a good idea to be well prepared. Here's some information to help you get ready, and what to expect from your doctor.
What you can do
- Be aware of any pre-appointment restrictions. At the time you make the appointment, be sure to ask if there's anything you need to do in advance, such as restrict your diet.
- Write down any symptoms you're experiencing, including any that may seem unrelated to the reason for which you scheduled the appointment.
- Write down key personal information, including any major stresses or recent life changes.
- Make a list of all medications, as well as any vitamins or supplements, that you're taking.
- Take a family member or friend along. Sometimes it can be difficult to absorb all the information provided during an appointment. Someone who accompanies you may remember something that you missed or forgot.
- Write down questions to ask your doctor.
Your time with your doctor is limited, so preparing a list of questions will help you make the most of your time together. List your questions from most important to least important in case time runs out. For toxic hepatitis, some basic questions to ask your doctor include:
- What is likely causing my symptoms or condition?
- Other than the most likely cause, what are other possible causes for my symptoms or condition?
- What kinds of tests do I need?
- Is my condition likely temporary or chronic?
- What is the best course of action?
- What are the alternatives to the primary approach that you're suggesting?
- I have these other health conditions. How can I best manage them together?
- Are there any restrictions that I need to follow?
- Should I see a specialist? What will that cost, and will my insurance cover it?
- Is there a generic alternative to the medicine you're prescribing me?
- Are there any brochures or other printed material that I can take with me? What websites do you recommend?
- What will determine whether I should plan for a follow-up visit?
In addition to the questions that you've prepared to ask your doctor, don't hesitate to ask questions during your appointment at any time.
What to expect from your doctor
Your doctor is likely to ask you a number of questions. Being ready to answer them may allow more time to cover points you want to address. Your doctor may ask:
- When did you begin experiencing symptoms?
- Have your symptoms been continuous or occasional?
- How severe are your symptoms?
- What, if anything, seems to improve your symptoms?
- What, if anything, appears to worsen your symptoms?
- What prescription and over-the-counter medications are you taking, and have you started any new medications recently?
- Do you take herbal or nutritional supplements?
- How much alcohol and how often do you drink?
- Have you noticed yellowing in the whites of your eyes?
- Has your urine color appeared darker?
- Does anyone in your family have a history of liver disease?
Tests and diagnosis
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Tests and procedures used to diagnose toxic hepatitis include:
- Physical exam. Your doctor will likely perform a physical exam and take a medical history. Be sure to bring to your appointment all medications you're taking, including over-the-counter drugs and herbs, in their original containers. Tell your doctor if you work with industrial chemicals or may have been exposed to pesticides, herbicides or other environmental toxins.
- Blood tests. Your doctor may order blood tests that look for high levels of certain liver enzymes. These enzyme levels can show how well your liver is functioning.
- Imaging tests. Your doctor may recommend a liver ultrasound or a computerized tomography (CT) scan of your liver to look for abnormalities.
- Liver biopsy. A liver biopsy can help confirm the diagnosis of toxic hepatitis. During a liver biopsy, a needle is used to extract a small sample of tissue from your liver. The sample is examined under a microscope.
Treatments and drugs
Treatments for toxic hepatitis include:
- Stopping exposure to the toxin. Doctors will work to determine what's causing your liver damage. Sometimes it's clear what's causing your symptoms, and other times it takes more detective work to determine a cause. In most cases, stopping exposure to the toxin causing liver inflammation will reduce the signs and symptoms you experience.
- A medication to reverse liver damage caused by acetaminophen. If your liver damage was caused by an overdose of acetaminophen, you'll receive a chemical called acetylcysteine. This antidote is most effective if administered within 16 hours of the acetaminophen overdose.
- Supportive care in a hospital. People with severe symptoms are likely to receive supportive therapy in the hospital, including intravenous fluids and medication to relieve nausea and vomiting.
- Liver transplant. When liver function is severely impaired, a liver transplant may be the only option for some people. A liver transplant is an operation to remove your diseased liver and replace it with a healthy liver from a donor. Most livers used in liver transplants come from deceased donors. In some cases, livers can come from living donors who donate a portion of their livers.
Because it's not possible to know how you'll react to a particular medication, toxic hepatitis can't always be prevented. But you may reduce your risk of liver problems if you:
- Limit medications. Take prescription and nonprescription drugs only when absolutely necessary. Investigate nondrug options for common problems such as high blood pressure, high cholesterol and arthritis pain.
- Take medications only as directed. Follow the directions exactly for any drug you take. Don't exceed the recommended amount, even if your symptoms don't seem to improve. Because the effects of over-the-counter pain relievers sometimes wear off quickly, it's easy to take too much.
- Be cautious with herbs and supplements. Don't assume that a natural product won't cause harm. Discuss the benefits and risks with your doctor before taking herbs and supplements.
- Don't mix alcohol and drugs. Alcohol and medications are a bad combination. If you're taking acetaminophen, don't drink alcohol. Ask your doctor or pharmacist about the interaction between alcohol and other prescription and nonprescription drugs you use.
- Take precautions with chemicals. If you work with or use hazardous chemicals, take all necessary precautions to protect yourself from exposure. If you do come in contact with a harmful substance, follow the guidelines in your workplace, or call your local emergency services or the poison control center for help.
- Keep medications and chemicals away from children. Keep all medications and vitamin supplements away from children and in childproof containers so that children can't accidentally swallow them.
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