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Toxic doses, over 10 grams per day for an adult, are much higher than typical doses of under 500 milligrams per day. A cup of coffee contains 80â175 mg of caffeine, depending on what bean (seed) is used and how it is prepared (e.g. drip, percolation, or espresso). Thus it requires roughly 50â100 ordinary cups of coffee to reach a lethal dose.
Caffeine is classified by the Food and Drug Administration as âgenerally recognized as safeâ (GRAS). Toxic doses are usually considered anything over 10 grams per day for an adult. To put that into context, one cup of coffee contains 80â175 milligrams of caffeine depending on the bean and preparation method. So someone would need to have roughly 50â100 ordinary cups of coffee to reach a lethal dose and have a true caffeine overdose.