Prescription and over-the-counter (OTC) drugs sold in the United States go through a series of medical trials and approval by the Food and Drug Administration (FDA). However, with billions of prescriptions filled each year, many drugs cause dangerous side effects and even death. Serious health ailments may occur when drugs are not tested strenuously enough with unforeseen side effects or complications can possibly result. Drug manufacturers, pharmacists and doctors have a responsibility to ensure that the drugs they prescribe their patients do not cause harm. While the FDA plays a regulatory role in approving and monitoring their safety after approval of a drug, the manufacturer is ultimately liable for any injuries from their medications.