**9. Conclusions**

There are two main population groups at risk of potential interactions: older people and the population with a higher educational level. With respect to other races, non-Hispanic whites present a higher risk of potential interactions. These results add important information about ways of approaching patients when they receive a prescription or ask for a medication. Health policy should take this information into account so as to inform healthcare professionals, and electronic tools should be developed or adapted to help in the re-assessment of their pharmacotherapeutic planning.

**Author Contributions:** Conceptualization, I.A.-L. and M.R.-V.; methodology, I.A.-L. and M.R.-V.; formal analysis, I.A.-L., M.R.-V. and C.C.-D. investigation; investigation, C.C.-D., I.M. and A.R.; writing-original draft, I.A.-L. and C.C.-D.; writing—review and editing, I.M., A.R., supervision M.R.-V.

**Funding:** This research received no external funding.

**Acknowledgments:** I.A.-L. and M.R.-V. have a research contract with the CIBERESP (CB16/02/00429) funded by the Instituto de Salud Carlos III, and CCD has a research contract with the Instituto de Salud Carlos III (PI15/00114). Both contracts are co-funded by the European regional development fund (ERDF). We are grateful to Stephen Kelly and Tom Yohannan for their contribution to editing the English of the article.

**Conflicts of Interest:** The authors declare no conflict of interest.
