Welcome, mikem! Good advice from FooZe. Research the rules of the airline you'll be flying and the specific countries. They spell it out pretty well, so you can proceed with confidence.

I've checked a bag only once. Coming back. I'd gone hooo-doggies hypo and bought too much. Lol. (It was so heavy! Just had to get a set of marble coasters, you know. Another trip I was lugging concrete statuary, so guess it's all relative. That time was train though.)

Ok, back on track. Even if I were one to check bags, I'd definitely have my meds in my carry-on. Stuff happens. Delayed flights, weather, what-have-you. Why chance it?

It's been awhile since I've gone international, but I can't imagine any regulations dictating they be in checked luggage, since, though you don't anticipate needing yours during the flight, others would. Check, of course, but I can't imagine it.

Packing for a recent flight (domestic) I got kind of wiggy about the meds thing. There were so damn many of them(!) Half-expected the Spanish Inquisition. Nope. I had them all together in a big plastic bag. Otherwise they'd be all over the place. Plus, I figured, it's right out there, nothing to hide. Now... in reading, I found where one agency did not insist they be in original bottles, while another one did. My take on that is: do the original bottles. That way you're covered.

Happy travels! (Even if it is stressful, may everything go nice and smoothly for you in all regards.)