Background Cancer patients can be a human model of potential drug interactions. Usually they receive a large number of different medications, including antineoplastic agents, drugs for comorbid illness and medication for supportive care, however information about these interactions are fragmented and poor. Objective We assessed a prospective study to evaluate the prevalence of drug interaction among patients hospitalized in the Onco-Haematology department, Hospital of Piacenza. Methods Data on drugs administered for cancer, comorbidities, or supportive care were collected from different computerized prescription software in use in the department; we compared them with a database to focus on the co-administration of drugs. A literature review was performed to identify major potential drug interaction and to classify them by level of severity and by strengths of scientific evidence. Results In this study 284 cancer patients were enrolled; patients had taken an average of seven drugs on each day of therapy plus chemotherapeutic agents, we identified 67 potential drug interactions. At least 53 patients had one potential drug interaction. Of all potential drug interactions 63 were classified as moderate severity and only four as major. In 55 cases chemotherapeutic agents were involved in possible interactions with supportive care drugs, meanwhile in 12 cases the potential drug interactions were between supportive care drugs. Conclusions In our centre, thanks to a computerized prescription software, integrated with caution alarm in case of possible interaction, we had a lower rate of potential drug interactions than the one from literature. It is possible to improve the software integrating the alarm with the potential drug interactions between chemotherapy agents and supportive care drugs.

In recent years, the expenditure for cancer care is increased largely due to the increase in cancer prevalence, demographic changes and incorporation into clinical practice of new and expensive drugs. For these reasons, solutions to contain costs are necessaries. The drugs-related expenditure is proportionally higher in oncology than in other medical specialties and overcomes staffing costs for outpatient care. The introduction of additional measures to contain and reduce expenditures such as waste reduction and human resources optimization is highly desirable. On April 2013, we started a day-to-day monitoring of the consumption of drugs and developed an internal protocol for waste minimization, consisting of five measures. A computerized research through Medline, Cancerlit and Embase was performed, applying the words drug waste, cost-containment, Anticancer Drug Unit and stability instructions. Articles and abstracts were also identified by back-referencing from other relevant papers. Selected for the present review were papers published in English without limit of year. The day-to-day monitoring of the consumption of drugs and the internal protocol for waste minimization were able to achieve a saving of 15,700 every month. The projection of an annual cost-saving result of 188.00 corresponds to a recovery of 4 % on the spending for oncologic drugs. Our data show that in a proper structure working according to the standards of quality, safety and sterility, preserving and reusing the drug waste within the limits imposed by the datasheets, it is possible to achieve a cost-containment policy and produce durable benefits.

Cancer patients can be a human model of potential drug-drug interaction (PDIs). Usually they receive a large number of different medications, including antineoplastic agents, drugs for comorbid illness and medication for supportive care, however information about these interactions are fragmented and poor, so we assessed a prospective study to evaluate the prevalence of drug interaction among patients hospitalized in the Onco-Haematology department, Hospital of Piacenza.