Adverse Effects of Rhodiola Rosea

Common Adverse Effects and Drug Interactions

The most common adverse effects of rhodiola rosea are headache, nausea (up to 30%), gastrointestinal disturbances, dizziness, and insomnia. Potential drug interactions include serotonin syndrome with SSRIs and effects on drugs metabolized by cytochrome P450 2C9.

Abstract

Rhodiola rosea supplementation is most often linked to mild, transient adverse effects. In controlled trials using daily doses between 340 and 680 mg, symptoms reported included headache, nausea (up to 30% in one trial), gastrointestinal disturbances, dizziness, and insomnia. Some trials noted no adverse events at all. Studies document drug interactions, indicating that rhodiola rosea can precipitate clinically significant events, such as serotonin syndrome when combined with selective serotonin reuptake inhibitors. Pharmacokinetic studies suggest potential inhibition of cytochrome P450 2C9, affecting medications with a narrow therapeutic index, as well as other CNS-active drugs.

Methods

An analysis was conducted on 37 sources from an initial pool of 999 using five screening criteria focusing on human participants, safety outcomes, study design, single ingredient attribution, and original data quality.

Paper Search

Using the query "What are the most common adverse effects and potential drug interactions associated with rhodiola rosea supplementation?", a search was conducted across over 126 million academic papers.

Screening

• Human Participants: Studies involving humans taking rhodiola rosea supplements.
• Safety Outcomes: Studies reporting adverse effects, side effects, safety outcomes, or drug interactions.
• Study Design: Includes randomized controlled trials, cohort studies, case-control studies, case series, case reports, systematic reviews, or meta-analyses.
• Single Ingredient Attribution: Studies attributing effects specifically to rhodiola rosea.
• Original Data Quality: Studies containing original data with sufficient methodological detail.

Data Extraction

Data was extracted from each study into several columns:

• Study Design: Types of study design including RCT, open-label, observational, or reviews/meta-analyses.
• Participant Characteristics: Total participants, age range, gender distribution, specific health conditions, inclusion/exclusion criteria.
• Rhodiola Rosea Intervention Details: Extract name, dosage, frequency, duration, method of administration.
• Adverse Effects and Drug Interactions: Types, severity, frequency of adverse events, specific drug interactions, serious adverse events.
• Safety Profile and Tolerability: General safety assessment, proportion of participants experiencing side effects, safety statements, recommendations.

Summary of Study Characteristics

• Study Design: 17 randomized controlled trials, 9 observational studies, 9 systematic reviews/meta-analyses.
• Population: 15 studies with healthy adults; 16 studies with clinical populations.
• Rhodiola Dose and Duration: Reported doses ranged from 60 mg to 1500 mg, commonly between 340–680 mg/day.

Adverse Effects Profile

• Reported Adverse Effects: Mild, transient symptoms like headache, gastrointestinal disturbances, dizziness, insomnia.
• Frequency/Incidence: 19 studies reported no adverse events, 11 provided quantitative incidence data.
• Severity Assessment: Most studies reported mild adverse effects, with few cases of severe reactions.

Drug Interactions

Significant potential for interactions, especially with psychotropic medications. Studies highlighted risks of serotonin syndrome and other serious reactions when combined with SSRIs. Inhibition of cytochrome P450 enzymes may affect metabolism of other drugs.

Dose-Response Relationships for Safety

No clear dose-dependent increase in adverse events within daily dose ranges commonly used. Typically effective and safe doses are 200–600 mg per day with rare mild side effects.

References

1. J. Woroń, M. Siwek (2018). Unwanted effects of psychotropic drug interactions. Psychiatria Polska.
2. A. Bystritsky et al. (2008). Pilot study of Rhodiola rosea for generalized anxiety disorder. Journal of Alternative and Complementary Medicine.
3. I. Maniscalco et al. (2014). Interaction of Rhodiola rosea and antidepressants. Neuropsychiatrie (Deisenhofen).
4. D. Edwards et al. (2012). Effects and Safety of Rhodiola rosea Extract WS® 1375. Phytotherapy Research.
5. S. Hung et al. (2011). Efficacy and efficacy of Rhodiola rosea L. Phytomedicine.