> must be taken continually to be effective

Just want to add this here in case anybody's unfamiliar: PrEP can also be taken on an event-driven schedule, rather than the daily dose most people are familiar with. Under this regime, you take two doses two hours before sexual activity (or upto 24 hours earlier), followed by a single dose 24 hours after the first 2 pills, and a final dose 24 hours after that. If sexual activity can be planned or is infrequent, this 2+1+1 regime might be preferred.