Background and Importance Precautionary cancellation is a new tool for primary care and hospital pharmacist that allows them to cancel prescriptions and avoid dispensing medicines at pharmacies.

Aim and Objectives Analyse the precautionary annulments made in a hospital and quantify the degree of acceptance of the doctor.

Material and Methods Prospective study lasting five months in a country hospital. All patients outpatients with onco-haematological prescriptions and home treatment were included. The precautionary annulments were codified as safety: interaction between drug (INT): category X (avoid combination) and category D (modify therapy), unnecesassary medication (UM), overdose (OD) and therapeutic duplicity (TDUP). The variables collected were: age, sex, prescribing service, type of precautionary annulments and degree of acceptance of the doctor. Sources used: digital clinical history Diraya, corporate dispensing module, Uptodate interactions and electronic prescription program Farmis Oncofarm v4.0.11.164.

Results We analysed 35 precautionary annulments. Population of mean age 52 years (range 46-87). 71% were women. The prescribing services were Oncology (97.14%) and Hematology (2.86%). The precautionary annulments were of safety: INT 80% (category X 85.72% and category D 14.28%), UM 14.28%, OD 2.86% and DUPL 2.86%. The degree of acceptance of the doctor was 88.57% and modified the treatment 11.43%.

Conclusion and Relevance The results of the series studied show a high degree of acceptance by the doctor of the precautionary cancellations made by the hospital pharmacist. It is a useful safety tool, emphasising serious interactions.

References and/or Acknowledgements Acknowledgements to the Congress

Conflict of Interest No conflict of interest.