Medication needed for travelling around Central America

Hi everyone, I’m travelling to Central America soon and was wondering what medication people actually recommend bringing and what’s better to just buy there?
I’m going to bring basics like painkillers, antihistamines, etc but I’ve found from travelling that local products have often outperformed products I’ve brought and been significantly cheaper.
Also, mosquitoes love me 🙈is it better to bring strong repellent from home or is it easy to get good stuff locally? Thanks in advance 😊