Category: Infections
Question: Can PEP work after ten days of exposure it failed what next
Answer: Compliments of the season  

PEP postexposure prophylaxis means taking antiretroviral medicines ART after being potentially exposed to HIV to prevent becoming infected It is advised that PEP must be started within 72 hours after a possible exposure to HIV 

Not entirely sure what you mean by failure but if you need to repeat the test in 3 months after exposure However speak to a health professional if you have any concerns 

Regards