Potentially harmful drug-drug interactions in the therapeutic regimens of persons with spinal cord injury

Shikha Gupta; Alaina Dhawan; Jillian Dhawan; Mary Ann McColl; Karen M Smith; Alexander McColl

doi:10.1080/10790268.2023.2185399

Potentially harmful drug-drug interactions in the therapeutic regimens of persons with spinal cord injury

J Spinal Cord Med. 2023 Mar 27:1-9. doi: 10.1080/10790268.2023.2185399. Online ahead of print.

Authors

Shikha Gupta¹, Alaina Dhawan², Jillian Dhawan², Mary Ann McColl¹, Karen M Smith³, Alexander McColl⁴

Affiliations

¹ School of Rehabilitation Therapy, Faculty of Health Sciences, Queen's University, Kingston, Canada.
² Faculty of Health Sciences, Queen's University, Kingston, Canada.
³ Department of Physical Medicine and Rehabilitation, School of Medicine, Queen's University, Kingston, Canada.
⁴ University of New South Wales, Australia.

PMID: 36972222
DOI: 10.1080/10790268.2023.2185399

Abstract

Objectives: Individuals with spinal cord injury deal with multiple health complications that require them to use many medications. The purpose of this paper was to find the most common potentially harmful drug-drug interactions (DDIs) in therapeutic regimens of persons with spinal cord injury, and the risk factors associated with it. We further highlight the relevance of each of the DDIs specific to spinal cord injury population.

Design: Observational design and cross-sectional analysis.

Setting: Community; Canada.

Participants: Individuals with spinal cord injury (n = 108).

Main outcome measures/analysis: The main outcome was the presence of one or more potential DDIs that can lead to an adverse outcome. All the reported drugs were classified as per the World Health Organization's Anatomical Therapeutic Chemical Classification system. Twenty potential DDIs were selected for the analysis based on the most common medications prescribed to people with spinal cord injury and severity of clinical consequences. The medication lists of study participants were analyzed for selected DDIs.

Results: Among the 20 potential DDIs analyzed in our sample, the top 3 prevalent DDIs were Opioids + Skeletal Muscle Relaxants, Opioids + Gabapentinoids, and Benzodiazepines + ≥ 2 other central nervous system (CNS)-active drugs. Of the total sample of 108 respondents, 31 participants (29%) were identified with having at least one potential DDI. The risk of having a potential DDI was highly associated with polypharmacy, though no associations were found between the presence of a drug interaction and age, sex, level of injury, time since injury, or cause of injury among the study sample.

Conclusion: Almost three out of ten individuals with spinal cord injury were at risk of having a potentially harmful drug interaction. Clinical and communication tools are needed that facilitate identification and elimination of harmful drug combinations in the therapeutic regimens of patients with spinal cord injury.

Keywords: Drug interactions; Medication management; Polypharmacy; Secondary health conditions; Spinal cord injury.