HIV暴露后可否开始PrEP？

HIV暴露后可否开始PrEP？

PrEP（暴露前预防）是为那些长期处于高风险的群体设计的，适用于有持续高风险暴露于HIV的人，比如频繁的高风险性行为者或者与HIV感染者有长期接触的人。因此，PrEP 主要是预防性使用，目的是在暴露前就降低感染的风险。

而**PEP（暴露后预防）**适用于那些认为自己在最近的性接触或共享针具中可能暴露于HIV的人。PEP 是在潜在暴露后，通过服用抗逆转录病毒药物来防止感染 HIV。PEP 必须在暴露后72小时内开始使用。如果医生为你开具了PEP，你需要每天服药一次或两次，持续28天。

因此，如果你认为自己最近可能暴露于HIV，PEP 是你可以选择的方案，而不是 PrEP。PEP 能在潜在暴露后提供紧急预防措施，有效降低感染风险。

Can I start PrEP after HIV exposure?

PrEP (pre-exposure prophylaxis) is designed for individuals who are at ongoing high risk of HIV infection, such as people who engage in high-risk sexual behavior regularly or those who have ongoing exposure to someone with HIV. Therefore, PrEP is used preventively to reduce the risk of infection before exposure occurs.

On the other hand, PEP (post-exposure prophylaxis) is for individuals who think they have recently been exposed to HIV during sex or through sharing needles. PEP involves taking antiretroviral medications after potential exposure to prevent HIV infection. PEP must be started within 72 hours of exposure. If prescribed, you will need to take it once or twice daily for 28 days.

Therefore, if you believe you have been recently exposed to HIV, PEP is the appropriate option, not PrEP. PEP provides emergency prevention following exposure and is highly effective at reducing the risk of infection.