Most frequent medication errors and adverse drug events in primary care practices are communication problems and lack of knowledge, according to a recent study. Researchers from the Regenstrief Institute and Indiana University School of Medicine studied urban, suburban, and rural primary care practices in California, Connecticut, Oregon, and Texas that used MEADERS (Medication Error and Adverse Drug Event Reporting System) for 10 weeks, submitting 507 confidential event reports. Of the reports, 70% included medication errors only, whereas 2% included both medication errors and adverse drug events. Average time spent reporting an event was slightly more than 4 minutes.