A recent study by researchers at Harvard and York Universities found that millions of patients suffer from adverse reactions to prescription drugs they take to get better. Patients experience an estimated 81 million adverse reactions a year. Although most of these are medically minor, about 2.7 million hospitalizations and 128,000 deaths are attributed to properly prescribed drugs. Prescription drugs are the 4th leading cause of death. Hospitalizations and deaths from prescribing errors, overdose, and self medication would add to these totals.