PEP is an antiviral treatment given to individuals to reduce the chance of seroconverting due to a potential HIV infection.

PEP has been shown to be highly effective if given early after a high risk exposure. i.e. unprotected intercourse or needle stick injury.

PEP should begin as soon as possible after an exposure as its protective effect is reduced if begun after 72 hours. The usual course of treatment is 28 days. 

Because PEP can delay viral replication, individuals who have taken PEP should have an HIV test, 1, 3 and 6 months after the initial exposure. 

You should consult a specialized medical professional before starting the treatment to assess your risk.  If you require PEP urgently, please call 3160 4886/3162 0002 or email as we are one of the few centres in Hong Kong that can provide you with this medication.

  • PEP must be taken as soon as possible to be effective and no later than 72 hours after exposure to HIV.
  • PEP must be taken at the same time every day for 4 weeks.
  • PEP can cause side effects such as nausea and fatigue.
  • DO NOT stop taking PEP - talk to your healthcare professional.
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