International Journal of Clinical Pharmacy

, Volume 41, Issue 6, pp 1429–1433 | Cite as

Prevalence of potential drug–drug interactions in outpatients on treatment with parenteral antineoplastic drugs

  • M. Castro-ManzanaresEmail author
  • F. do Pazo-Oubiña
  • R. M. Rodríguez-Rincón
Short Research Report


Background As live expectancy and cancer incidence growing, polypharmacy in oncology patients is also increasing, raising the risk of developing potential drug–drug interactions.Objective To assess the prevalence of clinically relevant potential drug–drug interactions among cancer patients who receive parenteral treatment at our outpatient clinic. Method Retrospective observational study which included randomly selected patients who had received parenteral treatment from November 1st 2016 to January 31st 2017. Interactions were checked in 3 databases, and classified as clinically relevant or not and in three categories of severity: contraindicated, consider modification or monitor. Results A total of 273 patients were included; of which seventy three (26.7%) had at least one clinically relevant potential drug–drug interaction. Amongst them, 54 (74%) had at least one classified as monitor treatment, 50 (68.5%) as contraindicated and 26 (35.6%) as consider modification. The number of chronic prescriptions was associated with a higher risk of drug interactions. Conclusion Around one in four patients on treatment with parenteral antineoplastic drugs presented a clinically relevant potential drug–drug interaction. A systematic assessment of drug–drug interactions should be implemented to reduce the risk of clinically relevant drug–drug interactions.


Antineoplastic agents Drug–drug interactions Neoplasms Outpatients Polypharmacy 



We thank Mr. Jonathan McFarland for his contribution in the revision of English language of the manuscript.


The authors received no specific funding for this work.

Conflicts of interest

The authors have no conflict of interest to declare.


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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  1. 1.Pharmacy DepartmentHospital Universitari Son EspasesPalma de MallorcaSpain

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