This study will enroll individuals with certain conditions or diseases who are admitted to the hospital. Participants will be randomly assigned to either a control group, a minimal treatment group, or an enhanced treatment group. Participants in the minimal and enhanced treatment groups will meet with a pharmacist case manager while in the hospital to conduct a medication history review. The case manager will also meet with participants at the time of hospital discharge and provide them with a discharge summary and educational materials. Additionally, for participants in the enhanced treatment group, the case manager will do the following: transfer the discharge summary data to the participant's community physician and pharmacist; call the participant 3 to 5 days following discharge from the hospital and as needed thereafter to resolve medication problems; and communicate with and make recommendations to the participant's community physician and pharmacist. All participants will meet with a study research nurse immediately after study entry to complete questionnaires. Study nurses will also call all participants 30 and 90 days following hospital discharge to collect adverse event information. Surveys will be completed by each participant's pharmacist and primary care physician 90 days following the participant's discharge from the hospital.