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110mg is about two cups of coffee. no, it's not a lot of caffeine. in adults, fatalities have occurred with doses of approximately 10 grams. Source(s): Pharmacist. sal1970 Â· 6 years ago.
This is all good news for those who love coffee and/or energy drinks but have known heart arrhythmias. It looks like they can a have caffeine-laden beverages in moderation and still be safe. A moderate daily dose of caffeine for a healthy adult is between 300-400mg. Those with heart rhythm problems should probably aim for no more than 200mg daily. Most doctors advise patients with arrhythmias to quit or cut back on their caffeine consumption.