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hiv exposure

Do Tenofovir pills prevent infection after exposure?If so how long does it have to be after possible exposure?
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PEP is only effective up until 72 hours of exposure.It has a 85% sucess rate.
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i was given tenofovir pills to take for 30 days, 1per day are they the right pills?
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And what was the exposure?
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condom broke whilst having sex with  sum1 with an unknown status.sex lasted less than 3mins.
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It's was low risk then & whoever gave you nPEP is being extra cautious.
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