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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.
Taking one Excedrin and one Tylenol is fine, and even recommended over two Excedrins if the person is caffeine sensitive. The downside is that acetaminophen lurks in many medications, and overdose can destroy your liver. Excedrin has 250 mg and normal strength Tylenol has 350 mg of acetaminophen.