PEP - Effectiveness

PEP is at its most useful and effective when it is used as soon as possible after you put yourself at risk. You should aim to get to a clinic or hospital within 24 hours of being as risk of contracting HIV. PEP becomes less effective the longer you wait and clinics or hospitals will not give out the drug to anyone who has waited longer than 72 hours to present as being at risk after having unprotected sexual contact.