When I was on hypertension meds, I was on S1 scheduled meds which required a script (in Australia). I visited an Asian city and bought them over the counter without a script.

These medicines are not something you should take if you do not need them. "how dangerous can it really be" is pretty much why rule one exists. Not the least of which is, antibiotics are available over-the-counter in some countries, and this contributes to why antibiotics are not as potent as they used to be.