Drinking Mio caffeine straight?
My older sister and her friend have gotten into the habit of "overdosing on caffeine", as they like to call it. It's where they take a bottle of mio and drink straight from it, and not just a little bit, sometimes they drink an entire bottle in one go. I'm worried they might actually overdose or something, especially since my sister has undiagnosed minor(?) heart problems. Would they be okay if they continued doing this? Could it actually really hurt them?