How long should one take PrEP pills?

For PrEP to be effective one needs to take it for at least 7 days before any exposure to a risky sexual encounter. Thereafter the PrEP pill should be taken one a day for as long as the person remains at risk of HIV or as advised by a health care provider
You should not take two pills at the same time or on the same day to make up for a missed dose.to protect against other STIs its best to use PrEP alongside other prevention methods such as condoms