What should you know about injection for hepatitis B?

Hepatitis B vaccination trains the immune system to recognise the virus and is used as prevention. After a significant exposure, a clinician may consider urgent preventive treatment based on the source, timing and your previous vaccination. An injection does not by itself explain whether someone has hepatitis B. Blood tests can show whether there is current infection, past exposure or protection. Some people have no symptoms; others notice fatigue, dark urine, nausea, abdominal discomfort, or yellowing of the skin or eyes.

Tell a clinician about any needle injury, sexual exposure, contact with blood, or household exposure, including when it happened. Bring your vaccination record if available. Do not donate blood, share razors or toothbrushes, or share injecting equipment while your status is being clarified. Use barrier protection until a clinician explains the result and advises you. Arrange the recommended blood tests and follow-up; a liver function test may help assess liver irritation but cannot replace hepatitis B testing.

Seek urgent advice after a possible blood or sexual exposure because preventive treatment can be time-sensitive. Get emergency care for confusion, severe drowsiness, vomiting blood, black stools, severe abdominal pain, or yellowing with marked illness. Contact a clinician for persistent fatigue, dark urine, pale stools, or yellow skin or eyes.

Ask which tests are needed, whether you need vaccination or post-exposure treatment, how results will be explained, and how to protect household and sexual contacts. Ask when liver monitoring should be repeated.