Abstract
Introduction
Mental illness is a leading cause of non-fatal disease burden worldwide. Natural health products (NHPs) are sought by patients with mental health conditions as a safer and more ‘natural’ option than conventional pharmacotherapy; however, the possible adverse events (AE) and interactions between NHPs and prescription medicines are not fully known.
Objectives
The aim of this study was to determine (i) the prevalence of adult patients with mental health conditions taking prescription medications only, NHPs only, NHPs and prescription medications concurrently, or neither, (ii) which prescription medications and NHPs are most commonly used, (iii) AEs (serious and non-serious) experienced in the last 30 days for each product use group.
Methods
Mental health clinics in Alberta and Ontario, Canada, were included in an active surveillance study investigating NHP–drug interactions. On their first clinic visit, adult mental health patients were provided with a form inquiring about prescription drug use, NHP use, and any undesirable health events experienced in the last month. Healthcare professionals were also asked to report AEs.
Results
A total of 3079 patients were screened at 11 mental health clinics in Alberta and Ontario. In total, 620 AEs were reported in 447 patients (14.9%). The majority of adverse events were seen in patients using both NHPs and prescription medicines (58.8%), followed by patients taking only prescription medicines (37.1%), NHPs only (3.4%) and neither (0.67%). Combining NHPs and prescription medications increases the likelihood of experiencing AEs (OR 2.1; p < 0.001; 95% CI 1.7–2.6).
Conclusions
Adult patients with mental health conditions who are taking both prescription medications and NHPs are more likely to report an adverse event than patients taking prescription drugs or NHPs alone. Polypharmacy increases the likelihood of an adverse event. Active surveillance is feasible and could contribute to enhanced pharmacovigilance.
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Acknowledgements
We would like to thank to all members of the SONAR steering committee for their contributions on the development of the SONAR projects. A special thank you to Dr Heather Boon for her ongoing active collaboration in this work.
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Funding
This study received financial support from two Grants agencies in a partnership fund, Canadian Institute for Health Research (CIHR) (RES0021177) and Alberta Innovates Health Solutions (RES0025318), both from Edmonton, Alberta, Canada. The Grant agencies had no interventions or participation in the study or manuscript development.
Conflict of interest
Martin Katzman is a member on the advisory board for the following drug companies: Abbvie, Eisai, Empower Pharma, Janssen, Otsuka, Pfizer, Purdue, Santé Cannabis, Shire, Takeda and Tilray. He has also received honoraria from Allergan, Jansen, Lundback, Otsuka, Pfizer, Purdue, Shire, Takeda and Tilray, a research grant from Pfizer, and is involved in a clinical trial with Lundbeck. Joanne Barnes reports non‐financial support from Achieve Life Sciences during a clinical trial of cytisine. She also reports personal fees from New Zealand Ministry of Health Natural Health Products (NHPs) Regulations Subcommittee on the Permitted Substances List (member of subcommittee 2016–17), non‐financial support from Uppsala Monitoring Centre, Sweden (who manages the technical and scientific aspects of the WHO Programme for International Drug Monitoring); honorary consultant and herbal safety signal reviewer (2004–current), outside the submitted work. These conflicts are not related to this paper. All other authors have no conflicts of interest to disclose.
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The data that support the findings of this study are available on request from the corresponding author. The data are not publicly available due to privacy or ethical restrictions.
Consent to publish and participate
As is consistent with other SONAR studies, the initial screening questions are a part of ideal clinical care (e.g., best possible medication history), so HREB approval was granted making additional research consent unnecessary.
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This study was approved by the Human Research Ethics Board at the University of Alberta (MS21 Pro00025387). The STROBE guideline was used to report this study.
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Contribution statement: LZ, BK, CN, ES collect the study data and helped on the development of the manuscript, LU, PC, DK, MK, JB and SV developed the study methods and helped drafting the manuscript. All authors read and approved the final version.
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Zorzela, L., Khamba, B., Sparks, E. et al. Study of Natural Products Adverse Reactions (SONAR) in Adults with Mental Health Conditions: A Cross-Sectional Study. Drug Saf 44, 999–1006 (2021). https://doi.org/10.1007/s40264-021-01092-w
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DOI: https://doi.org/10.1007/s40264-021-01092-w