An analgesic or painkiller is any member of the group of drugs used to achieve analgesia, relief from pain . Analgesic drugs act in various ways on the peripheral and central nervous systems. read more
A painkiller overdose can occur when a person takes more than the amount of medication prescribed by his or her doctor, or more than the recommended dosage of an over-the-counter pain reliever. An individual who is in pain and has developed a tolerance for the medication being taken may be tempted to take a higher amount than directed or more frequently than instructed. read more