I'm not sure it's so easy, I travel a lot, and western cities are the hardest to get any medication.
In Hawaii we were robbed with my girlfriend and went to a pharmacy and to doctor with no papers and we weren't able to refill our contraception pill (pharmacy told us to go to doctor, doctors said we need a lot of tests even though she was already taking the medication and we had police reports). Generally it's not advised to skip a day, and skipping 2 is not allowed, but doctors didn't care.
(after a lot of search we found out that Amazon online clinic is much better and even cheaper with prescriptions).
In latin america or Thailand or anywhere else in the world we could just go to a pharmacy and get what we want.
