If you're assessed by a healthcare professional as being at risk of HIV transmission they will talk to you about taking Post Exposure Prophylaxis (PEP) medication.
PEP is a form of emergency HIV medication taken by someone who does not have HIV but who has, or may have been, very recently exposed to HIV.
PEP should be taken as soon as possible, but it can be taken up to 72 hours after exposure. The earlier it is taken the more effective it is.
PEP is also available from sexual health services or, out of hours, from A&E.