何时需要PEP？

何时需要PEP？

PEP（暴露后预防）必须在可能暴露后72小时内开始使用。越早开始PEP，效果越好；每一小时都很重要。

尽早开始PEP是防止HIV感染的关键。研究表明，如果在暴露后超过72小时才开始PEP，PEP对预防HIV感染的效果几乎没有或完全没有作用。

如果你被开具了PEP药物，你需要按照医生的指示每日服用一次或两次，持续28天。

PEP的有效性与其开始时间密切相关。PEP是一种紧急措施，用于防止在高风险暴露后发生HIV感染。如果你在以下情况下有过潜在的HIV暴露，PEP是一个必要的预防手段：

1. 性暴露：例如，在没有使用避孕套的情况下发生性行为，或者避孕套破裂导致暴露于HIV感染者的体液。

2. 注射毒品：共享针具等注射器具时，可能与HIV阳性者接触。

3. 性侵犯：如果在遭遇性侵犯后怀疑可能暴露于HIV。

在中国，随着HIV传播的认识逐渐普及，PEP已成为高风险群体（如同性恋男性、性工作者、注射毒品者）暴露后防止感染的重要手段。各大医院和急诊科已开始提供PEP药物，并为急需者提供紧急处理，确保及时启动治疗。

PEP (Post-Exposure Prophylaxis) must be initiated within 72 hours following a potential exposure to HIV. The sooner you begin PEP, the more effective it will be, and every hour counts in preventing HIV infection.

Research shows that PEP is less effective or may not work at all if started later than 72 hours after exposure. PEP is a critical measure to prevent HIV infection after high-risk exposures, such as:

1. Sexual Exposure: For example, unprotected sex or condom failure that leads to exposure to the bodily fluids of an HIV-positive person.

2. Injection Drug Use: Sharing needles or other injection equipment with someone who has HIV.

3. Sexual Assault: If you are sexually assaulted and exposed to HIV, PEP should be started as soon as possible.

In China, as awareness of HIV transmission continues to grow, PEP has become a key preventive tool for individuals at high risk, such as men who have sex with men, sex workers, and people who inject drugs. Hospitals and emergency departments are increasingly offering PEP medications and providing immediate assistance to ensure timely initiation of treatment.