Acetaminophen is one of the most known and used medical substances, entering into the composition of numerous OTC (over-the-counter) products. Perhaps its popularity makes patients to often ignore its danger of overdose. Like any medical substance, acetaminophen can be extremely harmful to the body, under abusive dosages, and few people know that an acetaminophen overdose can cause hepatotoxicity (liver injury). Acetaminophen has a weak analgesic action, preferred to treat fever, including young children, and to reduce symptoms of colds and flu. You can take acetaminophen when you have moderate pain such as headaches, back pain, menstrual or dental pain, if you suffer a sprain, a fracture or a dislocation. Acetaminophen is available in various pharmaceutical forms (tablets, suppositories or drops) and does not require prescription. Experts say that you can use it either alone or in combination with other analgesics or anti-inflammatory.