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There are several known mechanisms of action to explain the effects of caffeine.
Thus it requires roughly 50–100 ordinary cups of coffee to reach a lethal dose.
Withdrawal can cause mild to clinically significant distress or impairment in daily functioning.
The frequency at which this occurs is self reported at 11%, but in lab tests only half of the people who report withdrawal actually experience it, casting doubt on many claims of dependence.
A systematic review, analyzing the results of observational studies, suggests that women who consume large amounts of caffeine (greater than 300 mg/day) prior to becoming pregnant may have a higher risk of experiencing pregnancy loss.
However, acute ingestion of caffeine in large doses (at least 250–300 mg, equivalent to the amount found in 2–3 cups of coffee or 5–8 cups of tea) results in a short-term stimulation of urine output in individuals who have been deprived of caffeine for a period of days or weeks.