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PEP effectiveness at 39 hours
Oct 12, 2013

How effective is PEP if started at 39 hours after exposure? I heard it is recommended to be taken within 36 hours. I was 3 hours late.

Response from Dr. Wohl

There is no hard and fast rule or cut off regarding PEP. Animal studies show the sooner the better. After 3 days or so probably no benefit.

So, in reality it is impossible to say that starting at 39 hours is much worse than 36 hours.

DW



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