Since January 2016, nurses and midwives in Poland have had the right, with some restrictions, to prescribe medicines. Consequently, Polish patients received the same opportunity as in other countries worldwide: easier access to certain health services, i.e., medical prescribing. The aim of this study was to assess the impact of structural changes which increased the nurses’ competences on the accessibility to prescription visits for patients receiving primary healthcare on the example of Medical and Diagnostic Centre (MDC), and to discuss the general trend of legal changes in nursing profession regulations. We performed a detailed analysis of the data on the MDC patient population in Siedlce who received at least one prescription written by a general practitioner and/or a nurse/midwife in the years 2017–2019.The largest number of prescription visits made by nurses concerned patients aged 50–70 years, as this age range includes the largest number of patients with chronic diseases who need continued pharmacological treatment originally administered by doctors. An increasing tendency for prescription visits made by nurses was recorded, with a simultaneous downward trend in the same type of visits undertaken by doctors at MDC. Nurses’ involvement in prescribing medications as a continued pharmacotherapy during holiday seasons results in patients having continuous access to medication. An upward trend was also observed in the number of medications prescribed by nurses per patient. Structural changes in the legal regulations of the nursing profession improve patients’ access to prescription visits under primary healthcare. Further research is recommended to evaluate the dynamics of these trends and the impact of newly introduced nursing competences on the accessibility of prescription visits for patients.