Hepatitis A and B are serious diseases caused by virus. Hepatitis causes inflammation of the liver, vomiting, and jaundice (yellowing of the skin or eyes). Hepatitis can lead to liver cancer, cirrhosis, or death.

The hepatitis A and B vaccine is used to help prevent these diseases in adults. The vaccine works by exposing you to a small dose of the virus, which causes the body to develop immunity to the disease. This vaccine will not treat an active infection that has already developed in the body.

This vaccine is recommended for adults with risk factors for getting hepatitis A or B, including:

• having chronic liver problems, such as cirrhosis or hepatitis C, or needing a liver transplant;
• using intravenous (IV) drugs;
• living with a person who has either hepatitis A or B infection;
• having sexual contact with an infected person;
• having a blood clotting disorder such as hemophilia;
• being on dialysis or receiving blood transfusions;
• living in a correctional institution;
• being in the military or traveling to high-risk areas; and
• working in healthcare or public safety and being exposed to infected blood or body fluids.

Like any vaccine, the hepatitis A and B vaccine may not provide protection from disease in every person.

Hepatitis A and B vaccine will not protect you against infection with hepatitis C or E, or other viruses that affect the liver. It will also not protect you from hepatitis A or B if you are already infected with the virus, even if you do not yet show symptoms.

You should not receive this vaccine if you are allergic to yeast or neomycin, or if you have ever had a life-threatening allergic reaction to any vaccine containing hepatitis A or hepatitis B.

Tell your doctor if you have ever had:

• an allergy to latex rubber; or
• a weak immune system (caused by disease or by using certain medicine).

You can still receive a vaccine if you have a minor cold. In the case of a more severe illness with a fever or any type of infection, wait until you get better before receiving this vaccine.

Tell your doctor if you are pregnant or breastfeeding.

Use Twinrix Preservative-Free (Intramuscular) exactly as directed on the label, or as prescribed by your doctor. Do not use in larger or smaller amounts or for longer than recommended.

Get emergency medical help if you have signs of an allergic reaction: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Keep track of any and all side effects you have after receiving this vaccine. When you receive a booster dose, you will need to tell the doctor if the previous shot caused any side effects.

You should not receive a booster vaccine if you had a life-threatening allergic reaction after the first shot.

You may feel faint after receiving this vaccine. Some people have had seizure like reactions after receiving this vaccine. Your doctor may want you to remain under observation during the first 15 minutes after the injection.

Call your doctor at once if you have:

• numbness, pain, tingling, weakness, burning or prickly feeling, vision or hearing problems, trouble breathing;
• red or blistering skin rash; or
• easy bruising or bleeding (nosebleeds, bleeding gums).

Common side effects may include:

• redness or tenderness where the shot was given;
• headache; or
• tiredness.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report vaccine side effects to the US Department of Health and Human Services at 1-800-822-7967.

Follow your doctor's instructions about any restrictions on food, beverages, or activity.