Drugs used to treat cardiovascular and lung diseases are the most frequent cause of hospitalizations and emergency department visits related to inadequate therapy or ADEs. ADEs occur in 25% of patients who are able to walk and may cause up to 17% of hospital admissions among the elderly. A lack of communication and coordination between the hospital setting and the patient's own community setting, upon patient discharge, may contribute to the high number of ADEs. By expanding the role of pharmacists and encouraging communication between hospitals and pharmacists, the number of ADEs may be reduced. There have been a few small studies that have examined the way patient information is transferred between hospital and community pharmacists, but these studies did not involve the patients' primary care physicians nor did they fully evaluate the effect of communication between hospital and community pharmacists. The purpose of this study is to evaluate the effectiveness of providing a pharmacist case manager to hospitalized patients with cardiovascular or lung disease at reducing the number of ADEs, re-hospitalizations, and unscheduled medical visits.