Caffeine is a naturally occurring stimulant, found in certain foods and drinks. It is found in coffee, cola, tea and chocolate, among other things. It is also found as an additive in many over the counter and prescription pain medications. A brewed cup of coffee (6oz.) contains about 60-100 mg of caffeine. Soft drinks contain about 30-60 mg per 8 oz. Some common headache medications contain 16.25-65mg of caffeine. Caffeine pills typically contain 200mg of caffeine.