I have allergies to antibiotics, local anaesthetics, antihistamines, pain relief. I'm talking anaphylaxis. I wear a medic alert necklace with vital information inside.
Whenever I go overseas, (particularly each, of two Caminos because so rural and I only speak limited Spanish, and there for weeks at a time) I also take a printed translation re allergies, medic alert etc in the languages of any countries (stopover cities on route also). I had copy in a waterproof plastic bag, in my backpack, and with my passport and in 2011, my partner also carried a copy in his pack. Luckily I've never had to use it.
Also, 2015 my partner and I walked to raise awareness about young people diagnosed with Dementia because he was diagnosed in his 50s. He became unwell with chest infection but I was cautious about what 'complimentary' products to give him in the early days, that I could feel confident wouldn't be contraindicated with his medication. I took a copy of his scripts with us, and I had enough Spanish to ask pharmacist in Astorga (and showing scripts) if he could take something that I carried for me. The pharmacist got online and brought up the product, in English explaining the concerns that she had. So language wasn't a barrier in a potentially serious situation.