Prep is a medication used to prevent the transmission of HIV, the virus that causes AIDS. It is taken daily by individuals who are at high risk of contracting HIV, helping to reduce the chances of infection when exposed to the virus. When taken consistently, Prep can lower the risk of getting HIV from sexual activity by up to 99%. It is important for users to consult with a healthcare provider for regular check-ups and to discuss any potential side effects or interactions with other medications.