Fluid treatment is one of the basic medical procedures used in every hospital. To be properly conducted, it requires making complex decisions regarding the optimal volume, infusion rate, and type of fluids. Fluid therapy should only be used in patients with an insufficient oral or enteral route of fluid administration, and for the shortest possible time. Planning fluid therapy, the total and enteral fluid intake should be taken into account. There are many fluids that can be used and their choice should be reflected in the patient's condition. There are two types of substances whose solutions are used in parenteral fluid therapy: crystalloids and colloids. Crystalloids are the fluids of the first choice for intravenous fluid therapy: crystalloids remain for a relatively short time in the vascular tract, causing the extravascular water space to expand rapidly. Colloids are suspensions of macromolecules in solvents, whose task is to stabilize the intravascular water space. Pharmacovigilance is one of the most important elements of inpatient care. It is the pharmacist's task (as a specialist in the field of medicine and pharmacotherapy) to monitor the safety of the therapy. Scientific research shows that the participation of pharmacists in this process is necessary because they provide additional information that is not included in reports prepared by representatives of other medical professions. The task of the clinical pharmacist in the hospital ward is to analyze the ordered fluid therapy, a possible proposal for its correction, and above all, to analyze the prescribed solutions in terms of interactions with other medications used by the patient. Effective and safe pharmacotherapy depends on the rational selection of the appropriate medicinal product (taking into account not only active substances, but also auxiliary substances or buffers, which also affect the final therapeutic effect), proper selection of the optimal dosing schedule, and aseptic administration of the medicinal product. All this is aimed at eliminating the greatest possible number of side effects that may occur in the course of the patient's therapy

The functioning of health care centers is highly dependent on the quality of cooperation between medical staff - doctors, nurses, but also pharmacists. Pharmaceutical knowledge about medicines, combined with daily practice and supervision of the pharmacotherapy used, can bring a number of benefits, primarily increasing effectiveness and safety of treatment, as well as reducing the cost of treatment. Despite numerous difficulties, in some hospitals in Poland pharmacists undertake various types of clinical activities by directly joining the work of a hospital ward or remote monitoring of patient's pharmacotherapy using electronic systems. It should be emphasized that these are often tasks carried out outside the basic dimension of working time. The initiative taken in 2017 by the Director of the Provincial Specialist Hospital in Wroclaw, Research and Development Center, deserves a mention. Pharmacist (during the specialization in clinical pharmacy) was fully engaged in the work of hospital wards focusing first in the Department of Vascular Surgery, and then also General Surgery. Her daily duties include participation in medical celebrations, conducting medical history with newly admitted patients, optimization of pharmacotherapy, consultation with the medical and nursing team, control of orders and results of laboratory tests, giving advice to staff and educating patients in correct use of medicines. This kind of multidisciplinary cooperation has become a standard of care, which has been approved by the accreditation committee of the Center for Quality Monitoring in Health Care. In Poland, clinical pharmacy is constantly developing and gaining importance every year, but as of today, there are still no clear law regulations. Will the draft Act On The Pharmacy Profession adopted by the Council of Ministers introduce regulations and clearly define the place of a clinical pharmacist in the healthcare system? Undoubtedly, it would be a basic step to the further development of clinical pharmacy services.