31. Several studies have used social media to gather data on patients'adverse drug reactions ( ADRs ), with generally promising results. 32. In fact, adverse drug reactions ( ADRs ) often result from unanticipated changes in CYP2C9 enzyme activity secondary to genetic polymorphisms. 33. The FDA monitors reports of adverse drug reactions and has found no difference in the rates between generic and brand-name drugs. 34. The "'Yellow Card Scheme "'is the UK system for collecting information on suspected adverse drug reactions ( ADRs ) to medicines. 35. Federal regulations require that drug companies report adverse drug reactions to the drug agency within 15 days of learning about them. 36. According to the Council on Family Health, almost 40 percent of all adverse drug reactions reported each year involve people over 60. 37. The FDA estimates that between one and 10 percent of all adverse drug reactions are reported to its Adverse Events Reporting System. 38. Still, Merck-Medco quotes statistics that show nearly one in five hospitalizations of seniors 65 and over are due to adverse drug reactions . 39. In 1994, for example, the FDA said it received reports of 23, 890 hospitalizations and 7, 127 deaths from adverse drug reactions . 40. Other networks include the International Network for the Rational Use of Drugs ( INRUD ) as well as Adverse Drug Reaction Network.
