PrEP - pre-exposure Prophylaxis

I've just started the process to get this on the health service ..free here in Scotland.
Just seened to be so many on it now; guys wanting sex without condoms but how do you know they are taking it properly or enough. Can be a daily dosage or event-based dosing.

so if I take it I'm protected against hiv, not stis, and they test for all b4 they let you have it, and monitoring every few months.

anyone else got some experience with it?

Simon