project |
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Name/scientific name |
HEPATITIS A VACCINE
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Self-financed or subsidized by the Hospital Authority |
Hospital Authority Drug Formulary
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Indications |
Hepatitis A
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body system |
Immunization preparations and vaccines
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type |
Vaccines and antisera
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Hepatitis A vaccine is a vaccine that prevents hepatitis A virus infection. It contains parts of the virus that prompt the body to produce antibodies to fight the virus. Hepatitis A vaccination can effectively prevent hepatitis A infection, which is especially important for people traveling to areas with high risk of hepatitis A.
In Hong Kong, hepatitis A vaccine is usually recommended for the following people:
- People planning to travel to areas with a high risk of hepatitis A
- Food handler or restaurant worker
- Healthcare workers
- People with chronic liver disease or other health problems
Getting the hepatitis A vaccine is generally safe, and common side effects include mild pain or redness and swelling at the injection site. If you experience any unusual reactions, seek medical advice immediately.
Finally, vaccination is an effective way to prevent hepatitis A infection. Please ask your doctor for more information about hepatitis A vaccination.
How to use: Hepatitis A vaccine is usually injected into the upper arm muscle. Both adults and children can receive this vaccine. Vaccination is usually recommended 2 to 4 weeks before traveling abroad. No specific food restrictions or activity restrictions are required.
Dosing Guidelines: The standard dose for adults and adolescents is 0.5 ml, with a second dose usually given 6 to 12 months after the first dose to ensure adequate protection. For children, dosage is based on age and weight, and your doctor will provide appropriate dosage recommendations on an individual basis. For infants and young children, the second dose is usually given 6 to 18 months after the first dose. If necessary, your doctor may adjust the dosage to suit an individual's immune needs. There may be slight discomfort after vaccination, such as localized pain or fever, but most cases are mild and resolve on their own within a few days.
You may experience mild discomfort after taking the hepatitis A vaccine, such as redness, swelling, pain or fever at the injection site. Rare side effects include headache, fatigue, muscle pain, loss of appetite, nausea, diarrhea, or rash. A very small number of people may experience severe allergic reactions such as difficulty breathing, swelling of the throat, or general redness. If serious side effects occur, seek medical attention immediately. After vaccination, keep observing your physical condition and seek medical advice promptly if you have any abnormal reactions.
Drug contraindications are warnings that certain drugs are inappropriate for use in certain circumstances. For hepatitis B vaccine, contraindications include people who are allergic to any of the ingredients or who have had a severe reaction to a previous vaccination. It should be used with caution during pregnancy and the pros and cons should be considered under the guidance of a doctor. Patients with immunosuppressive conditions or who are receiving immunosuppressive therapy may not be candidates for this vaccine. Vaccination should be postponed for people with acute severe illness. If you have had a severe allergic reaction to hepatitis B vaccine before, you should avoid vaccination again. Doctors should be informed about allergies, existing medical conditions, pregnancy status and medications being taken before vaccination to ensure safety. In summary, people with the above conditions should avoid taking the hepatitis B vaccine to avoid adverse effects on the body.
Precautions for use: Be sure to tell your doctor about any allergic reactions, pregnancy, or immune system problems before receiving the hepatitis A vaccine. You may experience mild discomfort after vaccination, such as fever or pain at the injection site, which usually goes away on its own within a few days. If you have persistent or severe discomfort, seek medical advice immediately.
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Pregnant women should consult their doctor before taking the hepatitis A vaccine. Normally, vaccines do not cause harm to the fetus, but it is still recommended to avoid vaccination during pregnancy to ensure the health of mother and child. If you have been vaccinated and find out that you are pregnant, you should contact your doctor immediately and follow your doctor's recommendations for follow-up treatment.
Also, if you are planning to become pregnant or are currently planning a pregnancy, it is recommended to stop vaccination at least one month before conception. This will help avoid any potential risks. At the same time, if you have any physical discomfort or reaction after vaccination, please inform your doctor immediately so that appropriate measures can be taken.
Overall, the risk of getting hepatitis A is higher than the potential risks the vaccine may pose to pregnancy. Therefore, you should consider your health status and risk factors when deciding whether to get vaccinated. If you have any questions, it is recommended that you seek professional medical advice.
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