Everybody should get on PrEP. It’s cheap, it’s proven, you don’t have to trust your partners. If you’re having casual sex, you should be on PrEP.
So how long before one’s next flight to Thailand should one start taking this? Asking for a friend.
7 days of dosing before and after sexual encounter are required for many PrEP medications, consult with your doctor / medication document to verify
You don’t just casually take any number of medications just in case you might get in touch with something. How many pills would we have to take? 100 daily?
If your sexually active with casual partners, who also have casual partners, PrEP could be a sensible risk avoidance for you.
Also consider HPV vaccine, condom use, etc…
Everything is dependent on risk profile