Mixagrip has a warning side effects that just as you described. It's a medication from where I live and we have this website that explains the side effects of it.
https://www.k24klik.com/p/mixagrip-flu&batuk-capl-4s-strip-25s-8817
While there's no mention of caffeine, be wary to use it with alcohol though generally, you shouldn't drink caffeine either.
Thank you so much for this.
It's surprising to see this Mixagrip available over there in your country.
I'm going to put a control💯
because mixagrip is from my country and just like indomie too hehe :D
Indomie too?
Wow!
I need to make research 😅