PrEP is most effective when taken every single day. When taken less than 4 days per week, the effectiveness drops dramatically. If you miss a dose, make sure to take the next one - there is no need to double up. If you take 7 PrEP pills per week, the level of protection is about 99%. If you take 4 PrEP pills per week, the level of protection is about 96%
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