Objective: Cardiovascular disease (CVD) drugs have been frequently implicated in adverse drug reaction (ADR)-related hospitalizations. Drug–drug interactions (DDIs) are common preventable cause of ADRs, but the impact of DDIs in the CVD population has not been investigated. Hence, the primary aim of the study was to identify DDIs associated with ADRs in CVD patients at hospital admission. The second aim was to develop a simple tool to identify high-risk patients for DDI-related adverse events. Methods: An observational study was conducted on the Cardiology Ward of University Clinical Hospital Center. Data were obtained from medical charts. A clinical panel identified DDIs implicated in ADRs, using LexiInteract database and Drug Interaction Probability Scale. Statistics were performed using PASW 22 (SPSS Inc.). Results: DDIs contributed to hospital admission with a total prevalence of 9.69%. DDI-related ADRs affected mainly cardiac function (heart rate or rhythm, 41.07%); bleeding and effect on blood pressure were equally distributed (17.86%). Non-cardiovascular ADRs were found in 23.21% of DDIs. After admission, 73% of the identified DDIs led to changes in prescription. Prediction ability of calculated DDI adverse event probability scores was rated as good (AUC = 0.80, p < .001). Conclusions: CVD patients are highly exposed to adverse DDIs; about one in ten patients hospitalized with CVD might have a DDI contributing to the hospitalization. Given the high prevalence of CVD, DDI-related harm might be a significant burden worldwide. Identification of patients with high DDI adverse event risk might ease the recognition of DDI-related harm and improve the use of electronic databases in clinical practice.

The COVID-19 pandemic exerted a profound impact on health systems worldwide. Moreover, significant concerns were raised in terms of middle- and long-term consequences of postponing care in non-COVID patients. The primary aim of the study was to describe the remote pharmaceutical care service (telepharmacy) during the COVID-19 pandemic in the Republic of Srpska (RS), Bosnia and Herzegovina. The secondary aim was to identify service users’ needs and concerns and to describe community pharmacists’ interventions. Ten community pharmacists were appointed by the Pharmaceutical Society of the RS to deliver telepharmacy services. After obtaining users’ verbal permission, pharmacists documented issues discussed with them. The prospective data collection included the period from April 13 to May 21, 2020. Descriptive and statistical analysis was performed using IBM SPSS Statistics software (ver. 22). A total of 71 service users’ charts were analyzed. Telepharmacy users were on average 61.31 ± 13.27 years of age, with almost equal gender distribution. Patients with chronic or acute/subacute conditions were predominant with a share of 84.5%. Chronic diseases were the main reason for searching pharmacists’ consultation (74.6%), 7% had a complaint about worsening of a chronic condition, 9.9% reported only acute/subacute conditions as ambulatory conditions, whereas 15.5% asked information about coronavirus or COVID-19. The vast majority of patients’ and users’ needs were addressed by a pharmacist during counseling and only 15.5% of the patients required immediate referral to a doctor for refill/prescribing purposes. Remote pharmaceutical care service (telepharmacy) is deemed a convenient model in the RS during the COVID-19 pandemic. Patients and users presented with explicit and specific needs and concerns, both COVID- and non-COVID-related, which should not be neglected. Community pharmacists showed a high level of resilience and ability in addressing patients' needs.