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Suspected adverse reactions associated with herbal products used for weight loss: spontaneous reports from the Italian Phytovigilance System

  • Pharmacoepidemiology and Prescription
  • Published:
European Journal of Clinical Pharmacology Aims and scope Submit manuscript

Abstract

Purpose

Overweight and obesity represent worldwide a rising health problem. In this context, dietary supplements and herbal preparations are often used as self-medication for weight loss. The aim of this study was to describe the safety profile of dietary supplements for weight control by analyzing spontaneous reports of suspected adverse reactions (ARs) received by the Italian Phytovigilance System, from July 2010 to October 2017.

Methods

The suspected ARs were collected using an ad hoc reporting form, registered in a database at the National Institute of Health and evaluated by a multidisciplinary group of experts. The causality assessment was performed using the WHO-UMC system or the CIOMS/RUCAM score. In case of serious adverse reactions, a feedback is provided to the reporter by e-mail.

Results

Sixty-six spontaneous reports were collected. ARs involved cardiovascular system (26%), liver (14%), central nervous system (12%), skin (9%), gastrointestinal system (17%), thyroid (8%), kidney (4%), and other organs/systems (10%). In 64% of cases, the reaction was serious. Dechallenge was positive in 46 cases; three cases of positive rechallenge were reported. After the causality assessment, the association between the product intake and the adverse reaction was judged as possible in the majority of the cases (n = 43; 65%).

Conclusions

The data collected confirmed the existence of safety concerns on herbal dietary supplements used for body weight control, mainly related to quality of products and their use as self-medication. In this scenario, spontaneous reports represent the only tools available to monitor safety of these products.

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Funding

No sources of funding were used to conduct the study described in the manuscript, or to assist with the preparation of the manuscript.

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Contributions

All co-authors agreed to be accountable for all aspects of the work and have participated substantially in the work to take public responsibility for appropriate portions of the content. The contribution of each author is stated below. Mazzanti has performed the research, analyzed data, and wrote the paper. Vitalone has analyzed data and wrote the paper. Da Cas has performed the research and analyzed data. Menniti has performed the research, analyzed data, and wrote the paper.

Corresponding author

Correspondence to Annabella Vitalone.

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Mazzanti, G., Vitalone, A., Da Cas, R. et al. Suspected adverse reactions associated with herbal products used for weight loss: spontaneous reports from the Italian Phytovigilance System. Eur J Clin Pharmacol 75, 1599–1615 (2019). https://doi.org/10.1007/s00228-019-02746-6

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